# CheckTown

> Free online validators, converters, and developer tools. No account needed. Instant results.

CheckTown is a collection of 253 free browser-based tools for developers, analysts, and anyone who works with data. All tools run in the browser — no server-side processing of sensitive input, no registration, no cost.

Available in 9 languages: English, French, Dutch, Ukrainian, Spanish, Italian, Polish, Portuguese, Russian.

## Validators

- [All Validators](https://check.town/validators)
- [Email Validator](https://check.town/email-validator): Free email address validator. Instantly check syntax, domain existence, MX records, and deliverability. No registration required. ([guide](https://check.town/blog/email-validator-guide))
- [IBAN Validator](https://check.town/iban-validator): Free IBAN validator. Instantly check format, country code, check digits, checksum, and BBAN structure. Bank identification included. No registration. ([guide](https://check.town/blog/iban-validator-guide))
- [BIC / SWIFT Validator](https://check.town/bic-validator): Free BIC/SWIFT code validator. Instantly verify institution code, country code, location code, and branch code. No registration required. ([guide](https://check.town/blog/bic-swift-validator-guide))
- [Phone Number Validator](https://check.town/phone-validator): Free phone number validator. Check format, country code, number type, and validity for international numbers. No registration required. ([guide](https://check.town/blog/phone-number-validator-guide))
- [VAT Number Validator](https://check.town/vat-validator): Free VAT number validator. Instantly check format, country prefix, check digits, and structure for EU VAT numbers. No registration required. ([guide](https://check.town/blog/vat-number-validator-guide))
- [Address Validator](https://check.town/address-validator): Free address validator. Check street, city, postal code, and country accuracy. Verify addresses in 240+ countries. No registration required. ([guide](https://check.town/blog/address-validator-guide))
- [URL Validator](https://check.town/url-validator): Free URL validator. Instantly check format, protocol, hostname, structure, and HTTPS security. No registration required. ([guide](https://check.town/blog/url-validator-guide))
- [IP Address Validator](https://check.town/ip-validator): Free IP address validator. Check format, detect IPv4/IPv6, classify range, validate CIDR notation, and test reachability. No registration. ([guide](https://check.town/blog/ip-address-validator-guide))
- [Password Strength Checker](https://check.town/password-checker): Free password strength checker. Test security with entropy analysis, dictionary checks, and crack time estimates. No registration required. ([guide](https://check.town/blog/password-strength-checker-guide))
- [Data Format Validator](https://check.town/data-format-validator): Free JSON, YAML, and XML validator. Instantly validate syntax, format and beautify your data. No registration required. ([guide](https://check.town/blog/json-yaml-xml-validator-guide))
- [CSV Validator](https://check.town/csv-validator): Free CSV validator. Check encoding, delimiters, headers, row consistency, quoting, data types, and RFC 4180 compliance. Instant results. No registration require ([guide](https://check.town/blog/csv-validator-guide))
- [Credit Card Validator](https://check.town/credit-card-validator): Free credit card validator. Verify card numbers using the Luhn algorithm and detect card type (Visa, Mastercard, AMEX). ([guide](https://check.town/blog/credit-card-validator-guide))
- [YAML Validator](https://check.town/yaml-validator): Free YAML validator. Check YAML syntax with line-level error reporting, pretty-printed output, and key statistics. ([guide](https://check.town/blog/yaml-validator-guide))
- [HTML Validator](https://check.town/html-validator): Validate HTML markup online. Check for unclosed tags, deprecated elements, missing alt attributes, and syntax errors. Free tool. ([guide](https://check.town/blog/html-validator-guide))
- [CSS Validator](https://check.town/css-validator): Validate CSS code online. Check for syntax errors, malformed selectors, invalid properties, and deprecated features. Free tool. ([guide](https://check.town/blog/css-validator-guide))
- [XML Validator](https://check.town/xml-validator): Validate XML documents online. Check well-formedness, unclosed tags, encoding issues, and namespace errors. Free XML checker. ([guide](https://check.town/blog/xml-validator-guide))
- [SQL Validator](https://check.town/sql-validator): Validate SQL queries online. Check syntax for MySQL, PostgreSQL, SQLite, MariaDB, and SQL Server. Free SQL checker. ([guide](https://check.town/blog/sql-validator-guide))
- [Markdown Validator](https://check.town/markdown-validator): Validate Markdown syntax online. Check for broken links, inconsistent headings, and formatting issues. Free Markdown linter. ([guide](https://check.town/blog/markdown-validator-guide))
- [UUID Validator](https://check.town/uuid-validator): Free UUID validator. Check format, detect version (v1-v5), verify RFC 4122 variant, and identify nil/max UUIDs instantly. No registration required. ([guide](https://check.town/blog/uuid-validator-guide))
- [ISBN Validator](https://check.town/isbn-validator): Free ISBN validator. Verify ISBN-10 and ISBN-13 check digits, detect format, and convert between ISBN versions instantly online. ([guide](https://check.town/blog/isbn-validator-guide))
- [EAN / Barcode Validator](https://check.town/ean-validator): Free EAN barcode validator. Verify EAN-8, EAN-13, and UPC-A check digits, detect barcode type, and look up GS1 country prefixes. ([guide](https://check.town/blog/ean-barcode-validator-guide))
- [MAC Address Validator](https://check.town/mac-address-validator): Free MAC address validator. Check format (colon, dash, dot notation), detect unicast/multicast, local/universal, and look up vendor (OUI). ([guide](https://check.town/blog/mac-address-validator-guide))
- [Semver Validator](https://check.town/semver-validator): Free semantic versioning validator. Parse and validate version strings per semver.org specification, extract major/minor/patch, pre-release, and build metadata. ([guide](https://check.town/blog/semver-validator-guide))
- [Domain Name Validator](https://check.town/domain-validator): Free domain name validator. Verify format per RFC 1035, check label lengths, validate TLD, and detect internationalized domain names (IDN). ([guide](https://check.town/blog/domain-name-validator-guide))
- [Postal Code Validator](https://check.town/postal-code-validator): Validate postal and ZIP codes for 40+ countries. Check format, length, and character rules instantly. Free online tool. ([guide](https://check.town/blog/postal-code-validator-guide))
- [IMEI Validator](https://check.town/imei-validator): Free IMEI validator. Verify the 15-digit IMEI number format, validate the Luhn check digit, and extract the Type Allocation Code (TAC). ([guide](https://check.town/blog/imei-validator-guide))
- [VIN Validator](https://check.town/vin-validator): Free VIN validator and decoder. Validate 17-character VIN format, verify check digit, identify manufacturer (WMI), and decode model year. ([guide](https://check.town/blog/vin-validator-guide))
- [ISIN Validator](https://check.town/isin-validator): Free ISIN validator. Verify International Securities Identification Number format, validate country code, check character set, and Luhn check digit. ([guide](https://check.town/blog/isin-validator-guide))
- [ISSN Validator](https://check.town/issn-validator): Free ISSN validator. Verify International Standard Serial Number format, length, and modulus 11 check digit for journals and periodicals. ([guide](https://check.town/blog/issn-validator-guide))
- [LEI Validator](https://check.town/lei-validator): Free LEI validator. Verify 20-character Legal Entity Identifier format, LOU prefix structure, and MOD 97-10 check digits per ISO 17442. ([guide](https://check.town/blog/lei-validator-guide))
- [Date/Time Validator](https://check.town/date-time-validator): Validate date and time strings in ISO 8601, RFC 2822, Unix timestamp, and common formats. Free online tool. ([guide](https://check.town/blog/date-time-validator-guide))
- [Color Code Validator](https://check.town/color-code-validator): Validate and preview color codes in HEX, RGB, HSL, and HWB formats. Free online color checker. ([guide](https://check.town/blog/color-code-validator-guide))
- [JSONL Validator](https://check.town/jsonl-validator): Validate JSON Lines (JSONL) content line by line. Check syntax, find errors with line numbers. Free online tool. ([guide](https://check.town/blog/jsonl-validator-guide))
- [MIME Type Lookup](https://check.town/mime-type-lookup): Free MIME type lookup tool. Enter a file extension to find its MIME type, or enter a MIME type to find the file extension. Bidirectional lookup. ([guide](https://check.town/blog/mime-type-lookup-guide))
- [CSP Header Validator](https://check.town/csp-validator): Validate Content-Security-Policy headers. Check directives, find security risks, detect deprecated values. Free online tool. ([guide](https://check.town/blog/csp-validator-guide))
- [Robots.txt Validator](https://check.town/robots-txt-validator): Validate robots.txt syntax, check directives, find common mistakes. Free online robots.txt checker. ([guide](https://check.town/blog/robots-txt-validator-guide))
- [Sitemap Validator](https://check.town/sitemap-validator): Validate XML sitemaps. Check structure, URLs, lastmod dates, changefreq, and priority values. Free online tool. ([guide](https://check.town/blog/sitemap-validator-guide))
- [JWT Validator](https://check.town/jwt-validator): Free JWT validator. Validate JSON Web Token structure, decode header and payload, verify algorithm, and check token expiration claim. ([guide](https://check.town/blog/jwt-validator-guide))

## Developer Tools

- [All Developer Tools](https://check.town/dev-tools)
- [JWT Decoder](https://check.town/jwt-decoder): Free JWT decoder. Paste a JSON Web Token to instantly inspect its header, payload, claims, and expiration. No registration required. ([guide](https://check.town/blog/jwt-decoder-guide))
- [Hash Generator](https://check.town/hash-generator): Free hash generator. Create MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes instantly. No registration required. ([guide](https://check.town/blog/hash-generator-guide))
- [Base64 Encoder / Decoder](https://check.town/base64-encoder): Free online Base64 encoder and decoder. Encode text to Base64 or decode Base64 strings instantly. Supports URL-safe encoding and file upload. No registration re ([guide](https://check.town/blog/base64-encoder-guide))
- [Regex Tester](https://check.town/regex-tester): Free online regex tester. Build, test, and debug regular expressions with real-time match highlighting and flag support. No registration required. ([guide](https://check.town/blog/regex-tester-guide))
- [Cron Parser & Generator](https://check.town/cron-parser): Free cron expression parser and generator. Parse cron to human-readable text, build cron expressions visually, and see next execution times. No registration req ([guide](https://check.town/blog/cron-parser-guide))
- [Markdown Preview](https://check.town/markdown-preview): Free live Markdown preview tool. Write Markdown on the left, see rendered HTML on the right. Copy HTML output instantly. No registration required. ([guide](https://check.town/blog/markdown-preview-guide))
- [JSON Formatter](https://check.town/json-formatter): Free online JSON formatter, validator, and minifier. Beautify, validate, and compress JSON data instantly. No registration required. ([guide](https://check.town/blog/json-formatter-guide))
- [Text Diff](https://check.town/text-diff): Free text diff tool. Compare two texts and see additions, deletions, and changes highlighted. Supports line, word, and character comparison. ([guide](https://check.town/blog/text-diff-guide))
- [HTTP Status Codes](https://check.town/http-status-codes): Complete HTTP status code reference. Search all 1xx-5xx response codes with descriptions, common causes, and debugging tips. Free developer reference. ([guide](https://check.town/blog/http-status-codes-guide))
- [XML Formatter](https://check.town/xml-formatter): Free online XML formatter and validator. Beautify, validate, and minify XML data instantly with configurable indentation. ([guide](https://check.town/blog/xml-formatter-guide))
- [SQL Formatter](https://check.town/sql-formatter): Free online SQL formatter supporting MySQL, PostgreSQL, T-SQL, PL/SQL, and more. Beautify and minify SQL queries with configurable options. ([guide](https://check.town/blog/sql-formatter-guide))
- [Code Formatter](https://check.town/code-formatter): Free online code formatter for HTML, CSS, and JavaScript. Beautify messy code or minify for production. No registration required. ([guide](https://check.town/blog/code-formatter-guide))
- [Subnet Calculator](https://check.town/subnet-calculator): Free online subnet calculator. Calculate network address, broadcast, subnet mask, wildcard mask, and host range from CIDR notation. ([guide](https://check.town/blog/subnet-calculator-guide))
- [Meta Tag Generator](https://check.town/meta-tag-generator): Free meta tag generator with live Google SERP and social card previews. Generate HTML meta tags, Open Graph, and Twitter Card tags instantly. ([guide](https://check.town/blog/meta-tag-generator-guide))
- [JSON Diff](https://check.town/json-diff): Free online JSON diff tool. Compare two JSON documents side by side. See additions, deletions, and modifications at every path. ([guide](https://check.town/blog/json-diff-guide))
- [TOTP Generator](https://check.town/totp-generator): Free TOTP generator for 2FA testing. Generate time-based one-time passwords from Base32 secrets. Supports SHA-1, SHA-256, SHA-512. No server, 100% client-side. ([guide](https://check.town/blog/totp-generator-guide))
- [What's My IP / Browser Info](https://check.town/whats-my-ip): Check your public IP address, browser details, screen resolution, and system information instantly. Free, no sign-up required. ([guide](https://check.town/blog/whats-my-ip-guide))
- [Emoji Picker](https://check.town/emoji-picker): Free online emoji picker with search. Copy emojis and get Unicode code points, HTML entities, shortcodes, and CSS codes for developers. ([guide](https://check.town/blog/emoji-picker-guide))
- [CSS Minifier](https://check.town/css-minifier): Free online CSS minifier. Remove comments, whitespace, and unnecessary characters to reduce file size. No registration required. ([guide](https://check.town/blog/css-minifier-guide))
- [HTML Minifier](https://check.town/html-minifier): Free online HTML minifier. Remove whitespace, comments, and compress inline CSS/JS. No registration required. ([guide](https://check.town/blog/html-minifier-guide))
- [JavaScript Minifier](https://check.town/js-minifier): Free online JavaScript minifier. Compress JS with variable mangling and dead code removal. No registration required. ([guide](https://check.town/blog/js-minifier-guide))
- [JSON Minifier](https://check.town/json-minifier): Free online JSON minifier. Remove whitespace and formatting to create compact JSON. Validates syntax automatically. No registration required. ([guide](https://check.town/blog/json-minifier-guide))
- [YAML Formatter](https://check.town/yaml-formatter): Free online YAML formatter and validator. Beautify and validate YAML data instantly with configurable indentation. ([guide](https://check.town/blog/yaml-formatter-guide))
- [Color Contrast Checker](https://check.town/color-contrast-checker): Check color contrast ratios against WCAG 2.1 AA and AAA standards. Enter foreground and background colors to verify accessibility compliance. ([guide](https://check.town/blog/color-contrast-checker-guide))
- [Readability Analyzer](https://check.town/readability-analyzer): Analyze text readability with Flesch-Kincaid scores, grade levels, and reading time estimates. Optimize your content for your target audience. ([guide](https://check.town/blog/readability-analyzer-guide))
- [URL Parser](https://check.town/url-parser): Parse and break down any URL into its components — protocol, host, port, path, query parameters, and hash fragment. Decode percent-encoded values. ([guide](https://check.town/blog/url-parser-guide))
- [Find and Replace](https://check.town/find-and-replace): Free online find and replace tool. Search and replace text with regex support, case-sensitive matching, and batch processing. ([guide](https://check.town/blog/find-and-replace-guide))
- [String Escape/Unescape](https://check.town/string-escape): Free string escape and unescape tool. Encode and decode strings for JSON, HTML, SQL, URL, and more. ([guide](https://check.town/blog/string-escape-guide))
- [Whitespace Remover](https://check.town/whitespace-remover): Free whitespace remover tool. Strip extra spaces, tabs, line breaks, and trailing whitespace from text. ([guide](https://check.town/blog/whitespace-remover-guide))
- [Text Repeater](https://check.town/text-repeater): Free text repeater tool. Repeat any text or string a specified number of times with custom separators. ([guide](https://check.town/blog/text-repeater-guide))
- [Text Cleaner](https://check.town/text-cleaner): Free text cleaner tool. Remove HTML tags, fix encoding issues, normalize whitespace, and clean up messy text. ([guide](https://check.town/blog/text-cleaner-guide))
- [ROT13 Encoder/Decoder](https://check.town/rot13-encoder): Free ROT13 encoder and decoder. Apply ROT13 cipher to encode or decode text instantly. ([guide](https://check.town/blog/rot13-encoder-guide))
- [Chmod Calculator](https://check.town/chmod-calculator): Free chmod calculator. Convert between symbolic and numeric Unix file permission formats. Interactive checkboxes with live output. ([guide](https://check.town/blog/chmod-calculator-guide))
- [Bcrypt Generator](https://check.town/bcrypt-generator): Free bcrypt hash generator and verifier. Hash passwords with bcrypt and verify existing hashes. ([guide](https://check.town/blog/bcrypt-generator-guide))
- [HMAC Generator](https://check.town/hmac-generator): Free HMAC generator. Create HMAC signatures using SHA-256, SHA-384, SHA-512, and other algorithms. ([guide](https://check.town/blog/hmac-generator-guide))
- [TOML Validator](https://check.town/toml-validator): Free TOML validator and formatter. Validate TOML syntax, detect errors with line numbers, and format your configuration files. ([guide](https://check.town/blog/toml-validator-guide))
- [Markdown Table Generator](https://check.town/markdown-table-generator): Free Markdown table generator. Create and format Markdown tables with a visual editor, column alignment, and instant preview. ([guide](https://check.town/blog/markdown-table-generator-guide))
- [JSON Path Tester](https://check.town/json-path-tester): Free JSON Path tester. Evaluate JSONPath expressions against JSON data and see results instantly. ([guide](https://check.town/blog/json-path-tester-guide))
- [JSON Schema Validator](https://check.town/json-schema-validator): Free JSON Schema validator. Validate JSON data against a JSON Schema definition with support for drafts 04, 06, 07, 2019-09, and 2020-12. ([guide](https://check.town/blog/json-schema-validator-guide))
- [JWT Encoder](https://check.town/jwt-encoder): Free JWT encoder. Create and sign JSON Web Tokens with custom claims and algorithms. ([guide](https://check.town/blog/jwt-encoder-guide))
- [Base32 Encoder](https://check.town/base32-encoder): Free Base32 encoder and decoder. Encode and decode text using Base32 (RFC 4648) with padding toggle and Base32Hex variant. ([guide](https://check.town/blog/base32-encoder-guide))
- [User Agent Parser](https://check.town/user-agent-parser): Free User Agent parser. Paste any UA string and see browser, OS, device, and engine components. ([guide](https://check.town/blog/user-agent-parser-guide))
- [JSON Tree Viewer](https://check.town/json-tree-viewer): Free JSON tree viewer. Paste JSON and navigate it as a collapsible tree with color-coded types and search. ([guide](https://check.town/blog/json-tree-viewer-guide))
- [HTML Live Preview](https://check.town/html-live-preview): Free HTML live preview. Write HTML, CSS, and JS in an editor and see a live preview in a sandboxed iframe. ([guide](https://check.town/blog/html-live-preview-guide))
- [OG Preview](https://check.town/og-preview): Free Open Graph preview tool. Paste OG meta tags and see how your links appear on Facebook, Twitter, and LinkedIn. ([guide](https://check.town/blog/og-preview-guide))
- [ASCII Table](https://check.town/ascii-table): Free interactive ASCII table. Browse, search, and copy characters from the ASCII and extended Unicode table. ([guide](https://check.town/blog/ascii-table-guide))
- [Regex Library](https://check.town/regex-library): Free regex pattern library. Browse curated regular expressions organized by category with one-click copy. ([guide](https://check.town/blog/regex-library-guide))
- [CSS Unit Converter](https://check.town/css-unit-converter): Free CSS unit converter. Convert between px, rem, em, vw, vh, and % with configurable base font size. ([guide](https://check.town/blog/css-unit-converter-guide))
- [AES Encrypt](https://check.town/aes-encrypt): Free AES encryption tool. Encrypt and decrypt text using AES-256-GCM with password-based key derivation. ([guide](https://check.town/blog/aes-encrypt-guide))
- [QR Code Reader](https://check.town/qr-code-reader): Free QR code reader. Upload or paste an image containing a QR code and instantly extract the encoded text or URL. ([guide](https://check.town/blog/qr-code-reader-guide))
- [Regex Explainer](https://check.town/regex-explainer): Free regex explainer. Paste any regular expression and get a plain-English breakdown of what each part matches. ([guide](https://check.town/blog/regex-explainer-guide))
- [htpasswd Generator](https://check.town/htpasswd-generator): Free htpasswd generator. Generate Apache and Nginx password file entries with bcrypt, SHA-1, or MD5 hashing. ([guide](https://check.town/blog/htpasswd-generator-guide))
- [SVG Optimizer](https://check.town/svg-optimizer): Free SVG optimizer. Upload or paste SVG code and get an optimized version with size reduction percentage. ([guide](https://check.town/blog/svg-optimizer-guide))
- [XPath Tester](https://check.town/xpath-tester): Free XPath tester. Enter an XPath expression and XML document to see matched nodes highlighted with result count. ([guide](https://check.town/blog/xpath-tester-guide))
- [JSON Sorter](https://check.town/json-sorter): Free JSON sorter. Paste JSON and sort all object keys alphabetically with deep or shallow mode toggle. ([guide](https://check.town/blog/json-sorter-guide))
- [.env Validator](https://check.town/env-validator): Free .env file validator. Check for syntax errors, duplicate keys, empty values, and formatting issues. ([guide](https://check.town/blog/env-validator-guide))
- [CORS Headers Generator](https://check.town/cors-headers-generator): Free CORS headers generator. Configure allowed origins, methods, headers, and credentials and copy the header set. ([guide](https://check.town/blog/cors-headers-generator-guide))
- [Network Port Reference](https://check.town/network-port-reference): Free network port reference. Search and browse common TCP/UDP ports with service names, protocols, and descriptions. ([guide](https://check.town/blog/network-port-reference-guide))
- [Typing Speed Test](https://check.town/typing-speed-test): Free typing speed test. Type random text passages and measure your WPM, accuracy, and error breakdown in real time. ([guide](https://check.town/blog/typing-speed-test-guide))
- [Character Counter](https://check.town/character-counter): Free character counter tool. Count characters, words, sentences, paragraphs, and estimate reading time. Track Twitter, SMS, and SEO limits. ([guide](https://check.town/blog/character-counter-guide))
- [Base58 Encoder](https://check.town/base58-encoder): Free online Base58 encoder and decoder using the Bitcoin alphabet. Convert text to Base58 and back instantly. No sign-up required. ([guide](https://check.town/blog/base58-encoder-guide))
- [Data URI Generator](https://check.town/data-uri-generator): Free online Data URI generator. Convert text or files to base64 data URIs for embedding in HTML, CSS, and JavaScript. No upload needed. ([guide](https://check.town/blog/data-uri-generator-guide))
- [JSON Repair](https://check.town/json-repair): Free JSON repair tool. Fix broken JSON with missing quotes, trailing commas, unquoted keys, and other syntax errors. Instant results, no registration. ([guide](https://check.town/blog/json-repair-guide))
- [JavaScript Playground](https://check.town/javascript-playground): Free online JavaScript playground. Run JS code snippets instantly in a secure sandboxed environment. No account required. ([guide](https://check.town/blog/javascript-playground-guide))
- [Docker Run to Compose](https://check.town/docker-run-to-compose): Free Docker Run to Compose converter. Transform docker run commands into docker-compose.yml format and vice versa instantly. ([guide](https://check.town/blog/docker-run-to-compose-guide))
- [Certificate Decoder](https://check.town/certificate-decoder): Free certificate decoder. Paste a PEM certificate to inspect subject, issuer, validity, SANs, key algorithm, and fingerprint. ([guide](https://check.town/blog/certificate-decoder-guide))
- [Code Screenshot](https://check.town/code-screenshot): Free code screenshot generator. Create beautiful code images with syntax highlighting, themes, and padding. Export as PNG. ([guide](https://check.town/blog/code-screenshot-guide))
- [Cron Expression Builder](https://check.town/cron-expression-builder): Free visual cron expression builder. Create cron schedules with toggles for minute, hour, day, month, and weekday. See next 5 runs. ([guide](https://check.town/blog/cron-expression-builder-guide))
- [.env Editor](https://check.town/env-editor): Free .env file editor. Parse, edit, sort, and validate environment files with duplicate detection and framework templates. ([guide](https://check.town/blog/env-editor-guide))
- [HTTP Header Analyzer](https://check.town/http-header-analyzer): Free HTTP header analyzer. Paste request or response headers to see parsed breakdowns with explanations and security assessments. ([guide](https://check.town/blog/http-header-analyzer-guide))
- [Regex Cheat Sheet](https://check.town/regex-cheat-sheet): Free interactive regex cheat sheet. Browse syntax groups, quick-copy patterns, and live examples for common regular expressions. ([guide](https://check.town/blog/regex-cheat-sheet-guide))
- [Diff Checker](https://check.town/diff-checker): Free diff checker tool. Compare two text blocks in a visual side-by-side view with line numbers and change highlighting. ([guide](https://check.town/blog/diff-checker-guide))
- [Mermaid Diagram Preview](https://check.town/mermaid-preview): Free Mermaid diagram preview tool. Write Mermaid syntax and see live-rendered flowcharts, sequence diagrams, and Gantt charts. Export as SVG or PNG. ([guide](https://check.town/blog/mermaid-preview-guide))
- [JSON Data Validator](https://check.town/json-data-validator): Free JSON data validator. Validate JSON data against a JSON Schema (drafts 4-2020-12) with detailed error paths and descriptions. ([guide](https://check.town/blog/json-data-validator-guide))

## Converters

- [All Converters](https://check.town/converters)
- [Color Converter](https://check.town/color-converter): Free color converter. Convert between HEX, RGB, and HSL formats instantly. Check WCAG contrast ratios for accessibility. No registration required. ([guide](https://check.town/blog/color-converter-guide))
- [Case Converter](https://check.town/case-converter): Free case converter. Convert text between camelCase, PascalCase, snake_case, kebab-case, and more. Live conversion as you type. ([guide](https://check.town/blog/case-converter-guide))
- [URL Encoder / Decoder](https://check.town/url-encoder): Free URL encoder and decoder. Encode or decode URLs and URI components instantly with encodeURIComponent and encodeURI. Auto-detects direction. ([guide](https://check.town/blog/url-encoder-guide))
- [HTML Entity Encoder / Decoder](https://check.town/html-entity-encoder): Free HTML entity encoder and decoder. Convert special characters to HTML entities using named, numeric, or hex formats. Instant results, no registration. ([guide](https://check.town/blog/html-entity-encoder-guide))
- [Slug Generator](https://check.town/slug-generator): Free slug generator. Convert any text into clean, URL-friendly slugs instantly. Custom separators, lowercase option, transliteration. No registration. ([guide](https://check.town/blog/slug-generator-guide))
- [Timestamp Converter](https://check.town/timestamp-converter): Free timestamp converter. Convert Unix timestamps to human-readable dates and back. Supports seconds, milliseconds, ISO 8601, UTC, and relative time. ([guide](https://check.town/blog/timestamp-converter-guide))
- [Number Base Converter](https://check.town/number-base-converter): Free number base converter. Convert between binary, octal, decimal, and hexadecimal instantly. Supports custom bases 2-36 with large number support. ([guide](https://check.town/blog/number-base-converter-guide))
- [Date Calculator](https://check.town/date-calculator): Free date calculator. Find the number of days between dates, add or subtract days/weeks/months, and get detailed date information. Business days supported. ([guide](https://check.town/blog/date-calculator-guide))
- [JSON to YAML Converter](https://check.town/json-to-yaml): Free online JSON to YAML and YAML to JSON converter. Transform data formats instantly with configurable indentation. No registration required. ([guide](https://check.town/blog/json-to-yaml-guide))
- [JSON to TypeScript](https://check.town/json-to-typescript): Free online JSON to TypeScript converter. Generate TypeScript interfaces or type aliases from JSON data. Supports nested objects, arrays, and optional fields. ([guide](https://check.town/blog/json-to-typescript-guide))
- [Byte Converter](https://check.town/byte-converter): Free online byte converter. Instantly convert between bytes, KB, MB, GB, TB, and PB. Supports both decimal (SI) and binary (IEC) units. ([guide](https://check.town/blog/byte-converter-guide))
- [Aspect Ratio Calculator](https://check.town/aspect-ratio-calculator): Free aspect ratio calculator. Calculate ratios from dimensions, find missing width or height, and preview common aspect ratios like 16:9, 4:3, and 1:1. ([guide](https://check.town/blog/aspect-ratio-calculator-guide))
- [Text to Binary Converter](https://check.town/text-to-binary): Free online text to binary converter. Convert text to binary, hexadecimal, octal, and ASCII decimal values instantly. Supports Unicode. ([guide](https://check.town/blog/text-to-binary-guide))
- [Morse Code Translator](https://check.town/morse-code-translator): Free online Morse code translator. Convert text to Morse code and back instantly. Listen to Morse code audio playback at adjustable speed. ([guide](https://check.town/blog/morse-code-translator-guide))
- [Duplicate Line Remover](https://check.town/duplicate-line-remover): Free duplicate line remover. Remove duplicate lines from text instantly. Options for case sensitivity, trimming, keep first or last, and sorting. ([guide](https://check.town/blog/duplicate-line-remover-guide))
- [Line Sorter](https://check.town/line-sorter): Free line sorter. Sort text lines alphabetically (A-Z, Z-A), naturally, or randomly. Real-time sorting with options for case sensitivity and trimming. ([guide](https://check.town/blog/line-sorter-guide))
- [Text Reverser](https://check.town/text-reverser): Free text reverser. Reverse text by characters, words, or lines. Includes reverse-each-word mode. Real-time reversal as you type. ([guide](https://check.town/blog/text-reverser-guide))
- [XML to JSON Converter](https://check.town/xml-to-json): Free online XML to JSON and JSON to XML converter. Transform data formats instantly with proper attribute handling. No registration required. ([guide](https://check.town/blog/xml-to-json-guide))
- [YAML to JSON Converter](https://check.town/yaml-to-json): Free online YAML to JSON and JSON to YAML converter. Transform data formats instantly with error reporting. No registration required. ([guide](https://check.town/blog/yaml-to-json-guide))
- [Markdown to HTML Converter](https://check.town/markdown-to-html): Free online Markdown to HTML converter. Transform Markdown into clean HTML with raw code view and rendered preview. No registration required. ([guide](https://check.town/blog/markdown-to-html-guide))
- [HTML to Markdown Converter](https://check.town/html-to-markdown): Free online HTML to Markdown converter. Transform HTML into clean Markdown with ATX headings and fenced code blocks. No registration required. ([guide](https://check.town/blog/html-to-markdown-guide))
- [Unit Converter](https://check.town/unit-converter): Free online unit converter. Convert between length, weight, temperature, volume, speed, area, and time units instantly. Supports metric, imperial, and more. ([guide](https://check.town/blog/unit-converter-guide))
- [Age Calculator](https://check.town/age-calculator): Free age calculator. Enter your birth date to see your exact age in years, months, and days. Includes total days lived, next birthday countdown, and zodiac sign ([guide](https://check.town/blog/age-calculator-guide))
- [BMI Calculator](https://check.town/bmi-calculator): Free BMI calculator. Enter your height and weight to calculate your Body Mass Index. Supports metric and imperial units with a visual scale and healthy weight r ([guide](https://check.town/blog/bmi-calculator-guide))
- [Tip Calculator](https://check.town/tip-calculator): Free tip calculator. Enter bill amount, tip percentage, and number of people to instantly see tip amount, total, and per-person split. ([guide](https://check.town/blog/tip-calculator-guide))
- [Scientific Calculator](https://check.town/scientific-calculator): Free online scientific calculator. Type expressions with trig functions, logarithms, and constants. Supports degree/radian mode with calculation history. ([guide](https://check.town/blog/scientific-calculator-guide))
- [Discount Calculator](https://check.town/discount-calculator): Free discount calculator. Calculate sale price, savings amount, and discount percentage instantly. ([guide](https://check.town/blog/discount-calculator-guide))
- [Roman Numeral Converter](https://check.town/roman-numeral-converter): Free Roman numeral converter. Convert between Roman numerals and decimal numbers instantly. ([guide](https://check.town/blog/roman-numeral-converter-guide))
- [Number to Words](https://check.town/number-to-words): Free number to words converter. Convert numbers into their written word form in multiple languages. ([guide](https://check.town/blog/number-to-words-guide))
- [Compound Interest Calculator](https://check.town/compound-interest-calculator): Free compound interest calculator. Calculate investment growth with compound interest over time. ([guide](https://check.town/blog/compound-interest-calculator-guide))
- [Loan Calculator](https://check.town/loan-calculator): Free loan calculator. Calculate monthly payments, total interest, and amortization schedules. ([guide](https://check.town/blog/loan-calculator-guide))
- [JSON to XML](https://check.town/json-to-xml): Free JSON to XML converter. Convert JSON to pretty-printed XML with configurable root element name. ([guide](https://check.town/blog/json-to-xml-guide))
- [Text to Hex](https://check.town/text-to-hex): Free text to hex converter. Convert text to hexadecimal and hex to text with configurable delimiter. ([guide](https://check.town/blog/text-to-hex-guide))
- [CSV to Markdown](https://check.town/csv-to-markdown): Free CSV to Markdown converter. Convert CSV data to a Markdown table with auto-aligned columns. ([guide](https://check.town/blog/csv-to-markdown-guide))
- [NATO Phonetic](https://check.town/nato-phonetic): Free NATO phonetic alphabet converter. Convert any text to NATO phonetic spelling for clear communication. ([guide](https://check.town/blog/nato-phonetic-guide))
- [Time Zone Converter](https://check.town/timezone-converter): Free time zone converter. Convert date and time between any two time zones with DST awareness. ([guide](https://check.town/blog/timezone-converter-guide))
- [Salary Calculator](https://check.town/salary-calculator): Free salary calculator. Convert salary between hourly, daily, weekly, monthly, and annual amounts. ([guide](https://check.town/blog/salary-calculator-guide))
- [Margin Calculator](https://check.town/margin-calculator): Free margin calculator. Calculate profit margin, markup percentage, cost, and revenue from any two values. ([guide](https://check.town/blog/margin-calculator-guide))
- [VAT Calculator](https://check.town/vat-calculator): Free VAT calculator. Calculate VAT-inclusive and VAT-exclusive prices with configurable tax rate. ([guide](https://check.town/blog/vat-calculator-guide))
- [Punycode Converter](https://check.town/punycode-converter): Free Punycode converter. Convert internationalized domain names between Unicode and Punycode (IDN) representation. ([guide](https://check.town/blog/punycode-converter-guide))
- [TOML to JSON Converter](https://check.town/toml-to-json): Free TOML to JSON converter. Convert TOML to JSON and JSON to TOML bidirectionally with syntax validation. ([guide](https://check.town/blog/toml-to-json-guide))
- [HTML to Text Converter](https://check.town/html-to-text): Free HTML to text converter. Paste HTML and extract clean plain text with tags stripped, entities decoded, and whitespace normalized. ([guide](https://check.town/blog/html-to-text-guide))
- [TSV to CSV Converter](https://check.town/tsv-to-csv): Free TSV to CSV converter. Convert between tab-separated and comma-separated values with proper quoting. ([guide](https://check.town/blog/tsv-to-csv-guide))
- [Image to ASCII Art](https://check.town/image-to-ascii): Free image to ASCII art converter. Upload an image and convert it to ASCII or Unicode character art with configurable width. ([guide](https://check.town/blog/image-to-ascii-guide))
- [Binary Calculator](https://check.town/binary-calculator): Free binary and bitwise calculator. Perform AND, OR, XOR, NOT, and shift operations with binary, octal, decimal, and hex display. ([guide](https://check.town/blog/binary-calculator-guide))
- [HTML to JSX](https://check.town/html-to-jsx): Free HTML to JSX converter. Transform class to className, inline styles to objects, self-close void elements, and convert 30+ attributes. ([guide](https://check.town/blog/html-to-jsx-guide))
- [JSON to SQL](https://check.town/json-to-sql): Convert JSON arrays to SQL INSERT statements for database import. Auto-detect column types, batch or individual inserts, optional CREATE TABLE. ([guide](https://check.town/blog/json-to-sql-guide))
- [JSON to Python](https://check.town/json-to-python): Free online JSON to Python converter. Generate Python dataclass, TypedDict, or dict literal definitions from JSON data. Supports nested objects, arrays, and opt ([guide](https://check.town/blog/json-to-python-guide))
- [JSON to Go](https://check.town/json-to-go): Free online JSON to Go converter. Generate Go struct definitions with json tags from JSON data. Supports nested structs, arrays, and omitempty tags. ([guide](https://check.town/blog/json-to-go-guide))
- [JSON to Java](https://check.town/json-to-java): Free online JSON to Java converter. Generate Java POJO, Lombok @Data, or Record classes from JSON data. Supports Jackson annotations, nested objects, and arrays ([guide](https://check.town/blog/json-to-java-guide))
- [JSON to Kotlin](https://check.town/json-to-kotlin): Free online JSON to Kotlin converter. Generate Kotlin data classes from JSON data. Supports nullable types, nested objects, and Gson @SerializedName annotations ([guide](https://check.town/blog/json-to-kotlin-guide))
- [JSON to Dart](https://check.town/json-to-dart): Free online JSON to Dart converter. Generate Dart class definitions with fromJson/toJson for Flutter apps. Supports null safety and json_serializable annotation ([guide](https://check.town/blog/json-to-dart-guide))
- [JSON to C#](https://check.town/json-to-csharp): Free online JSON to C# converter. Generate C# class or record definitions from JSON data. Supports System.Text.Json and Newtonsoft.Json annotations. ([guide](https://check.town/blog/json-to-csharp-guide))
- [JSON5 to JSON](https://check.town/json5-to-json): Free JSON5 to JSON converter. Strip comments, trailing commas, and unquoted keys from JSON5. Instant conversion, no registration. ([guide](https://check.town/blog/json5-to-json-guide))
- [Color Name Finder](https://check.town/color-name-finder): Free color name finder. Enter any HEX, RGB, or HSL color and find the closest named CSS color. Visual comparison, similarity score. No registration. ([guide](https://check.town/blog/color-name-finder-guide))
- [Electricity Cost Calculator](https://check.town/electricity-cost-calculator): Free electricity cost calculator. Calculate energy costs from wattage, daily usage hours, and rate per kWh with monthly and yearly projections. ([guide](https://check.town/blog/electricity-cost-calculator-guide))
- [Fuel Cost Calculator](https://check.town/fuel-cost-calculator): Free fuel cost calculator. Calculate trip fuel cost from distance, fuel efficiency (MPG or L/100km), and gas price. ([guide](https://check.town/blog/fuel-cost-calculator-guide))
- [GPA Calculator](https://check.town/gpa-calculator): Free GPA calculator. Calculate your grade point average from course grades and credit hours on the US 4.0 scale. ([guide](https://check.town/blog/gpa-calculator-guide))
- [Text to ASCII Table](https://check.town/text-to-ascii-table): Free text to ASCII table converter. Transform CSV, TSV, or JSON data into ASCII box-drawing tables for READMEs and code comments. ([guide](https://check.town/blog/text-to-ascii-table-guide))
- [Tailwind to CSS](https://check.town/tailwind-to-css): Free Tailwind to CSS converter. Convert Tailwind utility classes to equivalent vanilla CSS declarations. ([guide](https://check.town/blog/tailwind-to-css-guide))
- [HTML Table Generator](https://check.town/html-table-generator): Free HTML table generator. Build tables visually with add/remove row/column controls and export as HTML or Markdown. ([guide](https://check.town/blog/html-table-generator-guide))

## Data Tools

- [All Data Tools](https://check.town/data-tools)
- [CSV Viewer](https://check.town/csv-viewer): Free CSV viewer. Upload a CSV file to view, sort, and filter data in an interactive table. Column statistics included. No registration required. ([guide](https://check.town/blog/csv-viewer-guide))
- [CSV to JSON](https://check.town/csv-to-json): Free CSV to JSON converter. Upload a CSV file and instantly convert it to JSON format. Download or copy. No registration required. ([guide](https://check.town/blog/csv-to-json-guide))
- [JSON to CSV](https://check.town/json-to-csv): Free JSON to CSV converter. Paste or upload JSON data and convert it to CSV format. Configurable delimiter. No registration required. ([guide](https://check.town/blog/json-to-csv-guide))
- [Excel Reader](https://check.town/excel-reader): Free Excel reader. Upload XLS or XLSX files to view contents in an interactive table. Multi-sheet support. No registration required. ([guide](https://check.town/blog/excel-reader-guide))
- [Excel to CSV](https://check.town/excel-to-csv): Free Excel to CSV converter. Upload XLS or XLSX files and convert them to CSV format. Multi-sheet support. No registration required. ([guide](https://check.town/blog/excel-to-csv-guide))
- [CSV Diff](https://check.town/csv-diff): Free CSV diff tool. Compare two CSV files and see added, removed, and modified rows. Color-coded results. No registration required. ([guide](https://check.town/blog/csv-diff-guide))
- [PDF Tools](https://check.town/pdf-tools): Free online PDF tools. Merge multiple PDFs into one, split by page ranges, or compress to reduce file size. All processing happens in your browser. ([guide](https://check.town/blog/pdf-tools-guide))
- [CSV to SQL Converter](https://check.town/csv-to-sql): Free CSV to SQL converter. Convert CSV data into SQL INSERT and CREATE TABLE statements with auto-detected column types. ([guide](https://check.town/blog/csv-to-sql-guide))
- [JSON Flatten](https://check.town/json-flatten): Free JSON flatten tool. Flatten nested JSON to dot-notation paths and unflatten dot-notation back to nested JSON. ([guide](https://check.town/blog/json-flatten-guide))
- [File Hash Checker](https://check.town/file-hash-checker): Free file hash checker. Upload a file and compute MD5, SHA-1, SHA-256, and SHA-512 checksums client-side. ([guide](https://check.town/blog/file-hash-checker-guide))
- [CSV to JSONL](https://check.town/csv-to-jsonl): Free online CSV to JSON Lines (JSONL/NDJSON) converter. Paste CSV data and get one JSON object per line. Configurable delimiter and header options. ([guide](https://check.town/blog/csv-to-jsonl-guide))
- [SQL to CSV Converter](https://check.town/sql-to-csv): Free SQL to CSV converter. Parse INSERT statements and export data as CSV with custom delimiters and quoting options. No account required. ([guide](https://check.town/blog/sql-to-csv-guide))

## Generators

- [All Generators](https://check.town/generators)
- [Password Generator](https://check.town/password-generator): Generate secure random passwords and passphrases instantly. Customize length, character sets, and bulk generate up to 50. Free, no account needed. ([guide](https://check.town/blog/password-generator-guide))
- [UUID Generator](https://check.town/uuid-generator): Free UUID generator. Create UUID v4 and Nanoid identifiers instantly. Bulk generation, format options, and one-click copy. No registration required. ([guide](https://check.town/blog/uuid-generator-guide))
- [Random Number Generator](https://check.town/random-number-generator): Free random number generator with dice roller and coin flip. Generate secure random integers or decimals in any range. No registration. ([guide](https://check.town/blog/random-number-generator-guide))
- [Lorem Ipsum Generator](https://check.town/lorem-ipsum-generator): Free Lorem Ipsum generator. Create placeholder text by paragraphs, sentences, or words. Instant copy to clipboard. No registration required. ([guide](https://check.town/blog/lorem-ipsum-generator-guide))
- [QR Code Generator](https://check.town/qr-code-generator): Free QR code generator. Create QR codes from any text or URL instantly. Customize size, colors, and error correction. Download as PNG or SVG. ([guide](https://check.town/blog/qr-code-generator-guide))
- [Word & Character Counter](https://check.town/word-counter): Free online word counter. Count words, characters, sentences, paragraphs, and get reading time instantly. No signup required. ([guide](https://check.town/blog/word-counter-guide))
- [Percentage Calculator](https://check.town/percentage-calculator): Free percentage calculator. Find what percent one number is of another, calculate percentage change, or compute X% of Y. Instant results. ([guide](https://check.town/blog/percentage-calculator-guide))
- [Barcode Generator](https://check.town/barcode-generator): Free online barcode generator. Create barcodes in CODE128, EAN-13, EAN-8, UPC-A, CODE39, ITF-14 formats. Download as PNG or SVG. ([guide](https://check.town/blog/barcode-generator-guide))
- [Mock Data Generator](https://check.town/mock-data-generator): Free online mock data generator. Create realistic fake data for testing — names, emails, phone numbers, addresses. Export as JSON, CSV, or SQL. ([guide](https://check.town/blog/mock-data-generator-guide))
- [CSS Gradient Generator](https://check.town/css-gradient-generator): Free CSS gradient generator. Create linear, radial, and conic gradients visually. Pick colors, adjust angles, and copy the CSS code instantly. ([guide](https://check.town/blog/css-gradient-generator-guide))
- [Box Shadow Generator](https://check.town/box-shadow-generator): Free CSS box shadow generator. Create and customize shadows with multiple layers, colors, blur, and spread. Copy the CSS code instantly. ([guide](https://check.town/blog/box-shadow-generator-guide))
- [Color Palette Generator](https://check.town/color-palette-generator): Free color palette generator. Create complementary, analogous, triadic, and monochromatic palettes from any color. Export as CSS, Tailwind, SCSS, or JSON. ([guide](https://check.town/blog/color-palette-generator-guide))
- [Privacy Policy Generator](https://check.town/privacy-policy-generator): Generate a free, customized privacy policy for your website. GDPR and CCPA compliant. No sign-up required — runs entirely in your browser. ([guide](https://check.town/blog/privacy-policy-generator-guide))
- [Word Frequency Counter](https://check.town/word-frequency-counter): Free word frequency counter. Analyze text to find the most common words, their counts, and percentages. ([guide](https://check.town/blog/word-frequency-counter-guide))
- [List Randomizer](https://check.town/list-randomizer): Free list randomizer. Shuffle and randomize any list of items, names, or numbers with one click. ([guide](https://check.town/blog/list-randomizer-guide))
- [Crontab Generator](https://check.town/crontab-generator): Free crontab generator. Build cron expressions with a visual interface and human-readable descriptions. ([guide](https://check.town/blog/crontab-generator-guide))
- [Robots.txt Generator](https://check.town/robots-txt-generator): Free robots.txt generator. Create robots.txt files with user-agent rules, sitemaps, and crawl directives. ([guide](https://check.town/blog/robots-txt-generator-guide))
- [.gitignore Generator](https://check.town/gitignore-generator): Free .gitignore generator. Generate a .gitignore file by selecting from curated language and framework templates. ([guide](https://check.town/blog/gitignore-generator-guide))
- [Placeholder Image](https://check.town/placeholder-image): Free placeholder image generator. Generate images with custom dimensions, colors, text, and format. ([guide](https://check.town/blog/placeholder-image-guide))
- [Color Shades](https://check.town/color-shades): Free color shade generator. Generate tints, shades, and tones of any color with hex, RGB, and HSL values. ([guide](https://check.town/blog/color-shades-guide))
- [DMARC Generator](https://check.town/dmarc-generator): Free DMARC record generator. Generate a DMARC DNS record with policy, reporting, and alignment options. ([guide](https://check.town/blog/dmarc-generator-guide))
- [SPF Generator](https://check.town/spf-generator): Free SPF record generator. Generate an SPF DNS record with configurable mechanisms and qualifiers. ([guide](https://check.town/blog/spf-generator-guide))
- [Terms of Service Generator](https://check.town/tos-generator): Free Terms of Service generator. Generate a ToS document with configurable company details and clauses. ([guide](https://check.town/blog/tos-generator-guide))
- [Sitemap XML Generator](https://check.town/sitemap-generator): Free sitemap XML generator. Enter URLs with optional priority and frequency to generate a valid sitemap.xml file. ([guide](https://check.town/blog/sitemap-generator-guide))
- [.htaccess Generator](https://check.town/htaccess-generator): Free .htaccess generator. Build Apache .htaccess rules for redirects, caching, security headers, and GZIP compression. ([guide](https://check.town/blog/htaccess-generator-guide))
- [UTM Link Builder](https://check.town/utm-link-builder): Free UTM link builder. Enter a URL and UTM parameters to generate tagged URLs for Google Analytics campaign tracking. ([guide](https://check.town/blog/utm-link-builder-guide))
- [Text to ASCII Art](https://check.town/text-to-ascii-art): Free text to ASCII art generator. Type text and see it rendered as large ASCII art banners with a selection of fonts. ([guide](https://check.town/blog/text-to-ascii-art-guide))
- [HTTP Security Headers Generator](https://check.town/security-headers-generator): Free HTTP security headers generator. Configure HSTS, CSP, X-Frame-Options, Referrer-Policy, and Permissions-Policy headers for Nginx, Apache, and Express. ([guide](https://check.town/blog/security-headers-generator-guide))
- [README Generator](https://check.town/readme-generator): Free README generator. Fill in project details and generate a README.md with title, description, installation, usage, features, and license sections. ([guide](https://check.town/blog/readme-generator-guide))
- [JSON Schema Generator](https://check.town/json-schema-generator): Free JSON Schema generator. Paste example JSON and generate a JSON Schema (draft-07) with inferred types and required fields. ([guide](https://check.town/blog/json-schema-generator-guide))
- [Pomodoro Timer](https://check.town/pomodoro-timer): Free Pomodoro timer. Run customizable work and break intervals with session tracking and audio notifications. ([guide](https://check.town/blog/pomodoro-timer-guide))
- [Fancy Text Generator](https://check.town/fancy-text-generator): Free fancy text generator. Create stylish Unicode text in bold, italic, script, fraktur, and 16 more styles. Copy and paste anywhere. ([guide](https://check.town/blog/fancy-text-generator-guide))
- [WiFi QR Generator](https://check.town/wifi-qr-generator): Generate QR codes to share WiFi credentials instantly. Enter SSID, password, and encryption type. Scan with any phone camera to connect. ([guide](https://check.town/blog/wifi-qr-generator-guide))
- [ICS Generator](https://check.town/ics-generator): Free ICS calendar event generator. Create .ics files with recurrence, reminders, and location. Compatible with Google Calendar, Apple Calendar, Outlook. No regi ([guide](https://check.town/blog/ics-generator-guide))
- [CSS Text Shadow Generator](https://check.town/css-text-shadow-generator): Free CSS text-shadow generator with multiple layers, presets, and live preview. Design neon, embossed, retro, and 3D text effects visually. ([guide](https://check.town/blog/css-text-shadow-guide))
- [CSS Filter Generator](https://check.town/css-filter-generator): Free CSS filter generator with blur, brightness, contrast, grayscale, hue-rotate, and more. Live preview with presets and custom image upload. ([guide](https://check.town/blog/css-filter-guide))
- [CSS Border Radius Generator](https://check.town/css-border-radius-generator): Free CSS border-radius generator with per-corner control, unit switcher, shape presets, and live preview. Copy the CSS code instantly. ([guide](https://check.town/blog/css-border-radius-guide))
- [Cubic Bezier Generator](https://check.town/cubic-bezier-generator): Free cubic-bezier generator with interactive curve editor, draggable control points, animation preview, and preset easings. Copy CSS timing functions instantly. ([guide](https://check.town/blog/cubic-bezier-guide))
- [Dockerfile Generator](https://check.town/dockerfile-generator): Free Dockerfile generator for Node.js, Python, Go, Java, PHP, Ruby. Multi-stage builds, .dockerignore, and best practices. ([guide](https://check.town/blog/dockerfile-generator-guide))
- [Nginx Config Generator](https://check.town/nginx-config-generator): Free Nginx configuration generator. Build server blocks for reverse proxy, static sites, SSL, and PHP/Node backends visually. ([guide](https://check.town/blog/nginx-config-generator-guide))
- [SSH Key Generator](https://check.town/ssh-key-generator): Free SSH key generator. Create Ed25519 and RSA SSH key pairs entirely in your browser using Web Crypto API. No server upload. ([guide](https://check.town/blog/ssh-key-generator-guide))
- [RSA Key Generator](https://check.town/rsa-key-generator): Free RSA key generator. Create 2048 or 4096-bit RSA key pairs in PEM format entirely in your browser. No server upload. ([guide](https://check.town/blog/rsa-key-generator-guide))
- [CSS Glassmorphism Generator](https://check.town/css-glassmorphism-generator): Free CSS glassmorphism generator. Create frosted glass effects with adjustable blur, transparency, and border controls. ([guide](https://check.town/blog/css-glassmorphism-generator-guide))
- [CSS Loader Generator](https://check.town/css-loader-generator): Free CSS loader generator. Create CSS-only loading spinners and animations with customizable colors, sizes, and speeds. ([guide](https://check.town/blog/css-loader-generator-guide))
- [Email Template Builder](https://check.town/email-template-builder): Free email template builder. Create responsive HTML email templates with live preview, CSS inlining, and clipboard copy. ([guide](https://check.town/blog/email-template-builder-guide))

## Image Tools

- [All Image Tools](https://check.town/image-tools)
- [Image Compressor](https://check.town/image-compressor): Compress JPEG, PNG, and WebP images online for free. Reduce file size while maintaining quality. No upload to server — 100% browser-based. ([guide](https://check.town/blog/image-compressor-guide))
- [Image Resizer](https://check.town/image-resizer): Resize images online for free. Set custom width and height, maintain aspect ratio. No upload to server — 100% browser-based. ([guide](https://check.town/blog/image-resizer-guide))
- [Image Converter](https://check.town/image-converter): Convert images between PNG, JPEG, and WebP formats online for free. Adjust quality settings. No upload to server — 100% browser-based. ([guide](https://check.town/blog/image-converter-guide))
- [Image Cropper](https://check.town/image-cropper): Crop images online for free. Select any area to crop with precision. No upload to server — 100% browser-based. ([guide](https://check.town/blog/image-cropper-guide))
- [Background Remover](https://check.town/image-background-remover): Remove image backgrounds online for free. AI-powered background removal. No upload to server — 100% browser-based. ([guide](https://check.town/blog/image-background-remover-guide))
- [Image to PDF](https://check.town/image-to-pdf): Combine one or more images into a PDF document online for free. Choose page size, orientation, and margins. No upload to server — 100% browser-based. ([guide](https://check.town/blog/image-to-pdf-guide))
- [PNG to JPG](https://check.town/png-to-jpg): Convert PNG images to JPEG format online for free. Adjust quality and background color for transparency. No upload to server — 100% browser-based. ([guide](https://check.town/blog/png-to-jpg-guide))
- [JPG to PNG](https://check.town/jpg-to-png): Convert JPEG images to lossless PNG format online for free. No quality loss during conversion. No upload to server — 100% browser-based. ([guide](https://check.town/blog/jpg-to-png-guide))
- [Image to WebP](https://check.town/image-to-webp): Convert JPEG, PNG, and other images to WebP format online for free. Lossy or lossless compression with quality control. No upload to server — 100% browser-based ([guide](https://check.town/blog/image-to-webp-guide))
- [Image to Base64](https://check.town/image-to-base64): Convert images to Base64-encoded strings online for free. Get Data URI, raw Base64, HTML img tag, or CSS background-image. No upload to server — 100% browser-ba ([guide](https://check.town/blog/image-to-base64-guide))
- [Add Watermark](https://check.town/image-watermark): Add text watermarks to photos online for free. Customize text, opacity, position, rotation, and tiling. No upload — 100% browser-based. ([guide](https://check.town/blog/image-watermark-guide))
- [Image Rotate & Flip](https://check.town/image-rotate-flip): Rotate images 90°, 180°, 270° or any custom angle. Flip horizontally or vertically. No upload — 100% browser-based. ([guide](https://check.town/blog/image-rotate-flip-guide))
- [Image Blur](https://check.town/image-blur): Blur images online with adjustable intensity. Choose Gaussian blur or pixelate effect. No upload — 100% browser-based. ([guide](https://check.town/blog/image-blur-guide))
- [Favicon Generator](https://check.town/favicon-generator): Generate favicon files from any image. Create ICO and PNG variants in all sizes for websites and web apps. No upload — 100% browser-based. ([guide](https://check.town/blog/favicon-generator-guide))
- [Image Color Picker](https://check.town/image-color-picker): Pick any color from an image online for free. Click on the image to get HEX, RGB, and HSL color values. No upload to server — 100% browser-based. ([guide](https://check.town/blog/image-color-picker-guide))
- [Color Palette Extractor](https://check.town/image-color-palette): Extract dominant color and color palette from any image online for free. Get HEX, RGB, and HSL values. No upload to server — 100% browser-based. ([guide](https://check.town/blog/image-color-palette-guide))
- [SVG to PNG](https://check.town/svg-to-png): Convert SVG vector graphics to PNG raster images at any resolution. Choose scale (1x–4x) or set custom dimensions. No upload to server — 100% browser-based. ([guide](https://check.town/blog/svg-to-png-guide))
- [HEIC to JPG](https://check.town/heic-to-jpg): Convert HEIC and HEIF photos to JPEG or PNG online for free. Perfect for iPhone photos. No upload to server — 100% browser-based. ([guide](https://check.town/blog/heic-to-jpg-guide))
- [GIF to PNG](https://check.town/gif-to-png): Convert GIF images to PNG format online for free. Extracts the first frame from animated GIFs as a static PNG image. No upload to server — 100% browser-based. ([guide](https://check.town/blog/gif-to-png-guide))
- [Image Metadata Viewer](https://check.town/image-metadata-viewer): View EXIF, IPTC, and XMP metadata from any image online for free. See camera settings, GPS location, date, and more. 100% browser-based. ([guide](https://check.town/blog/image-metadata-viewer-guide))
- [Color Blindness Simulator](https://check.town/color-blindness-simulator): Free color blindness simulator. Upload an image or enter colors and preview how they appear under protanopia, deuteranopia, and tritanopia. ([guide](https://check.town/blog/color-blindness-simulator-guide))
- [Image Flip](https://check.town/image-flip): Flip and mirror images horizontally or vertically online for free. No upload to server — 100% browser-based processing. ([guide](https://check.town/blog/image-flip-guide))
- [Image Noise Generator](https://check.town/image-noise-generator): Free noise texture generator. Create Perlin, simplex, and white noise textures as PNG with customizable resolution and color. ([guide](https://check.town/blog/image-noise-generator-guide))

## Blog & Guides

- [Developer Guides](https://check.town/blog): Step-by-step guides for all tools with real-world examples.

## Legal

- [Privacy Policy](https://check.town/privacy)
- [Terms of Service](https://check.town/terms)
- [Cookie Policy](https://check.town/cookie-policy)
- [GDPR Compliance](https://check.town/gdpr)

## Optional

- [Full docs index](https://check.town/llms-full.txt)