Developer Guides
Developer Guides &
Tool Tutorials
279 free tools. One toolkit. Deep dive into each — how it works, when to use it, and real-world examples.
Email Validation: The Complete Guide to Verifying Email Addresses
Learn how email validation works, why it matters, and how to check any address in seconds.
IBAN Validation: How to Verify Bank Account Numbers Instantly
Understand IBAN structure, country formats, and how to catch errors before they cause payment failures.
BIC/SWIFT Code Validation: Everything You Need to Know
BIC and SWIFT codes identify banks in international transfers. Learn how to validate them correctly.
International Phone Number Validation Made Easy
Phone number formats vary wildly by country. Discover how to validate them reliably for any region.
VAT Number Validation: Check EU Business Tax IDs in Seconds
VAT numbers follow country-specific formats. Learn to validate them and avoid costly invoice errors.
Address Validation: Ensure Accurate Postal Data Every Time
Invalid addresses cause failed deliveries and data quality issues. Learn how to validate postal data.
URL Validation: How to Check If Links Are Valid and Safe
Broken links and malformed URLs hurt user experience and SEO. Learn what makes a URL valid.
IP Address Validation: IPv4 & IPv6 Checking Explained
IP address formats differ between IPv4 and IPv6. Learn how to validate both quickly and correctly.
Password Strength Checker: Build Secure User Authentication
Weak passwords are a leading cause of breaches. Learn how to measure password strength and enforce policies.
JSON, YAML & XML Validation: Format Checking for Developers
A single typo in a config file can crash your app. Learn to validate JSON, YAML, and XML instantly.
CSV Validation: Catch Data Errors Before They Cause Problems
CSV files are simple but error-prone. Learn how to validate structure, encoding, and data integrity.
Credit Card Validator: How the Luhn Algorithm Detects Invalid Numbers
Learn how credit card validation works, including the Luhn algorithm, BIN ranges, and card type detection.
YAML Validator: Check Syntax and Fix Indentation Errors
Validate YAML configuration files for syntax errors, duplicate keys, and indentation issues with precise error reporting.
HTML Validation: The Complete Guide to Clean Markup
Learn how HTML validation works, why it matters for SEO and accessibility, and how to fix common markup errors.
CSS Validation: The Complete Guide to Error-Free Stylesheets
Learn how CSS validation works, why browsers silently skip errors, and how to catch mistakes early.
XML Validation: Guide to Well-Formed and Structurally Correct Documents
Learn how XML validation works, the difference between well-formed and valid XML, and how to fix common errors.
SQL Validation: The Complete Guide to Query Syntax Checking
Learn how SQL validation works and how to catch syntax errors in queries before execution.
Markdown Validation: Check Formatting and Structure for Consistency
Learn how Markdown validation ensures consistent rendering across GitHub, GitLab, and other platforms.
UUID Validator: How to Check Format and Version of Any UUID
Learn what UUIDs are, the differences between v1 through v7, and how to validate UUID format and structure.
ISBN Validator: Check Book Numbers for ISBN-10 and ISBN-13
Learn how ISBN validation works, the difference between ISBN-10 and ISBN-13, and how to verify book numbers.
EAN Barcode Validator: Check EAN-13, EAN-8, and UPC-A Codes
Learn how EAN barcode validation works, the difference between EAN-13, EAN-8, and UPC-A formats.
MAC Address Validator: Check Format and Vendor Lookup
Learn about MAC address formats, validation rules, and how to identify device manufacturers via OUI lookup.
SemVer Validator: Check Semantic Versioning Format
Learn how semantic versioning works, the MAJOR.MINOR.PATCH format, and how to validate SemVer strings.
Domain Name Validator: Check DNS Naming Rules and TLD Types
Learn how domain name validation works, DNS naming rules, label constraints, and TLD types.
Postal Code Validation: Format Rules and Patterns by Country
Learn how postal codes differ across countries and how to validate them for accurate address data.
IMEI Validator: Check Mobile Device Identity Numbers
Learn what IMEI numbers are, how the Luhn check digit works, and how to validate mobile device identifiers.
VIN Validator: Check Vehicle Identification Numbers
Learn how VIN validation works, the 17-character structure, check digit algorithm, and VIN decoding.
ISIN Validator: Check Securities Identification Numbers
Learn how ISIN validation works, the ISO 6166 structure, and how to validate financial instrument identifiers.
ISSN Validator: Check Serial Publication Numbers
Learn how ISSN validation works, the 8-digit format, check digit calculation, and ISSN-L linking.
LEI Validator: Check Legal Entity Identifiers (ISO 17442)
Learn what LEIs are, how the ISO 17442 format works, and how to validate Legal Entity Identifiers.
Date-Time Validation: Format Checking and Calendar Logic
Learn how date-time validation catches format errors, impossible dates, and timezone issues.
Color Code Validation: Check Hex, RGB, and HSL Formats
Learn how to validate color codes in hex, RGB, and HSL formats for design-to-code consistency.
JSONL Validation: Line-by-Line JSON Checking for Data Pipelines
Learn how JSONL validation works and why line-by-line checking is essential for streaming data.
MIME Type Lookup: Find Content Types for Any File Extension
Learn what MIME types are, how they work in HTTP, and how to look up the correct Content-Type for any file.
CSP Validation: Check Content Security Policy Headers for Errors
Learn how to validate Content Security Policy headers and avoid common security misconfigurations.
robots.txt Validation: Check Crawl Directives for SEO
Learn how robots.txt validation catches errors that can hide pages from search engines.
Sitemap Validation: Check XML Sitemap Format and URLs
Learn how sitemap validation ensures search engines can discover and index all your pages.
JWT Validator: Check JSON Web Token Structure and Claims
Learn how JWT validation works, the header.payload.signature structure, and security best practices.
JWT Decoder: Inspect and Debug JSON Web Tokens Online
JWTs power modern authentication. Learn how to decode, inspect, and debug tokens without any tools.
Hash Generator: MD5, SHA-256 and More — When to Use Each
Hashing is fundamental to security and data integrity. Learn which algorithm to choose and when.
Base64 Encoding & Decoding: A Developer's Complete Guide
Base64 is everywhere in web development. Learn how it works, when to use it, and common pitfalls.
Regex Testing: Write and Debug Regular Expressions Instantly
Regular expressions are powerful but tricky. Learn how to write, test, and debug regex patterns effectively.
Cron Expression Parser: Schedule Tasks Like a Pro
Cron syntax is concise but cryptic. Learn to read, write, and validate cron expressions with confidence.
Markdown Preview: Write and Render Markdown in Real Time
Markdown is the universal format for developer docs. Learn the full syntax and preview your output live.
JSON Formatter: Beautify, Minify and Validate JSON Online
Messy JSON is hard to read and debug. Learn how to format, minify, and validate JSON data instantly.
Text Diff Tool: Compare Files and Spot Every Change
Spotting differences between text versions is tedious manually. Learn how diff tools work and speed up reviews.
HTTP Status Codes: The Complete Reference Guide
Look up any HTTP response code — from 100 to 599. Understand meanings, categories, and when to use each code.
XML Formatter: Beautify, Validate and Minify XML
Format, validate, and minify XML data with configurable indentation. Learn how XML formatting works.
SQL Formatter: Beautify and Minify SQL Queries
Format SQL queries for any dialect. Learn how SQL formatting improves readability, catches errors, and simplifies code review.
Code Formatter: Beautify and Minify HTML, CSS, JS
Format and minify HTML, CSS, and JavaScript code instantly. Learn how formatting improves readability and minification reduces file sizes.
Subnet Calculator: IPv4 CIDR, Masks and Hosts Guide
Learn how subnetting works and calculate IPv4 subnet details from CIDR notation. Network address, broadcast, hosts, and masks explained.
How to Generate Perfect Meta Tags for SEO
Create optimized meta tags, Open Graph, and Twitter Cards with live previews.
JSON Diff: How to Compare JSON Documents Structurally
Learn how JSON diffing works, why it beats plain text comparison, and how to spot every change between two documents.
TOTP Generator: Generate 2FA Codes from Secrets
Generate time-based one-time passwords (TOTP) from Base32 secrets. Parse otpauth:// URIs and manage 2FA codes securely.
What's My IP: Understanding Your IP Address & Browser Info
Learn what your IP address reveals, how to check it, and what browser information websites can see.
Complete Emoji Picker Guide for Developers
Find, copy, and use emojis with Unicode code points and HTML entities. Complete guide for web developers.
CSS Minifier Guide: Compress Stylesheets for Faster Loading
Learn how CSS minification works, what it removes, and how to reduce stylesheet file sizes for better performance.
HTML Minifier Guide: Reduce Page Size and Boost Speed
Learn how HTML minification strips whitespace, comments, and redundant attributes to shrink your web pages.
JavaScript Minifier Guide: Optimize JS Files for Production
Learn how JavaScript minification works, why it matters for performance, and how to shrink your scripts effectively.
JSON Minifier Guide: Compact JSON Data for APIs and Storage
Learn how JSON minification strips whitespace to reduce payload sizes for APIs, configs, and data storage.
YAML Formatter Guide: Format and Validate YAML Online
Learn how to format messy YAML, validate syntax, and fix common errors in configuration files.
Color Contrast Checker: WCAG AA & AAA Compliance Guide
Learn how WCAG contrast ratios work, the difference between AA and AAA levels, and tips for designing accessible color combinations.
Readability Analyzer: Understanding Flesch-Kincaid Scores
Analyze text readability with Flesch-Kincaid scoring. Learn what reading ease scores mean and how to improve your writing.
URL Parser: Understanding URL Structure and Components
Parse URLs into protocol, host, path, query parameters, and fragments. Learn URL structure, encoding, and debugging tips.
Find and Replace: A Complete Guide to Text Search and Replacement
Learn how find and replace works, when to use regex patterns, and tips for efficient text manipulation.
String Escaping: How to Handle Special Characters in Code
Understand string escaping for JSON, HTML, URL, SQL, and regex — and why it matters for security.
Whitespace Removal: Clean Up Spaces, Tabs, and Hidden Characters
Learn about different types of whitespace, when to remove them, and how to normalize text efficiently.
Text Repeater: Generate Repeated Strings for Testing and Development
Learn when and how to repeat text with custom separators for test data, placeholders, and more.
Text Cleaning: Strip HTML, Fix Encoding, and Sanitize Content
Learn text cleaning techniques for web scraping, data pipelines, and content migration.
ROT13 Encoder: Understanding the Simplest Letter Substitution Cipher
Learn how ROT13 works, why it is symmetric, and where this simple cipher is still used today.
chmod Calculator: Unix File Permissions Explained with Examples
Understand Unix file permissions, numeric notation, and common chmod values like 755, 644, and 600.
bcrypt: How Password Hashing Works and Why It Matters
Learn how bcrypt protects passwords with adaptive hashing, salt, and cost factor tuning.
HMAC: How Hash-Based Message Authentication Works
Understand HMAC signatures, key management, and how to verify message integrity with SHA-256, SHA-384, and SHA-512.
TOML Validation: Syntax Rules, Common Errors, and Best Practices
Learn TOML syntax for configuration files, common validation errors, and how it compares to YAML and JSON.
Markdown Tables: Syntax, Alignment, and Tips for Clean Documentation
Master Markdown table syntax with alignment options, escaping rules, and tips for readable documentation.
JSONPath: Query Language for Extracting Data from JSON Documents
Learn JSONPath syntax for filtering, slicing, and extracting values from complex JSON structures.
JSON Schema Validation: A Complete Guide to Schema Drafts and Rules
Validate JSON documents with JSON Schema. Learn about draft versions, composition keywords, and common patterns.
JWT Encoder: Create and Sign JSON Web Tokens for Authentication
Learn how JWTs work, understand signing algorithms, and create tokens for stateless API authentication.
Base32 Encoding: A Complete Guide
Learn how Base32 encoding works, when to use it, and how to encode and decode data.
User Agent Parsing: How to Read Browser and Device Information
Understand user agent strings and how to extract browser, OS, and device data.
JSON Tree Viewer: Navigate Complex JSON Visually
Learn how to explore large JSON structures using an interactive tree view.
HTML Live Preview: Code and See Results Instantly
Write HTML, CSS, and JavaScript with real-time preview in a sandboxed environment.
Open Graph Preview: How Your Links Appear on Social Media
Test and preview how your page links will look when shared on social platforms.
ASCII Table: The Complete Character Reference
Browse the full ASCII and extended Unicode character table with decimal, hex, and binary values.
Regex Library: Common Patterns You'll Actually Use
Browse a curated collection of regex patterns for email, URL, date, and more.
CSS Unit Converter: px, rem, em, and More
Convert between CSS units and understand when to use px, rem, em, vw, and vh.
AES Encryption: Secure Your Data with AES-256-GCM
Learn how AES encryption works and how to encrypt and decrypt text securely.
QR Code Reader: How to Scan and Decode QR Codes
Learn how QR codes work and how to read them from any image.
Regex Explainer: Understanding Regular Expressions
Demystify regex patterns with plain-English explanations.
htpasswd Generator: Apache and Nginx Basic Authentication
Learn how to generate htpasswd entries for web server authentication.
SVG Optimizer: Reduce SVG File Size Without Quality Loss
Learn SVG optimization techniques and best practices.
XPath Tester: Query XML Documents with XPath
Master XPath expressions for navigating XML data.
JSON Sorter: Organize JSON Keys Alphabetically
Learn why sorting JSON keys improves readability and diffs.
.env Validator: Check Environment File Syntax
Validate your .env files and catch common configuration mistakes.
CORS Headers Generator: Fix Cross-Origin Errors
Understand CORS and generate the correct headers for your API.
Network Port Reference: Common TCP and UDP Ports
Browse the essential network ports every developer should know.
Typing Speed Test: Measure Your WPM and Accuracy
Test and improve your typing speed with real-time feedback.
Character Counter: Count Characters, Words & Check Platform Limits
Learn how character counting works, why platform limits matter, and how to optimize your text for Twitter, SMS, and meta descriptions.
Base58 Encoding: Bitcoin Addresses, IPFS, and Beyond
Learn how Base58 encoding works, why it removes ambiguous characters, and where it is used in cryptocurrency and distributed systems.
Data URI Generator: Embed Files Inline as Base64
Data URIs let you embed file content directly in URLs. Learn when inline encoding improves performance and how to create them.
JSON Repair: Fix Broken JSON from APIs and LLMs
Repair malformed JSON with trailing commas, single quotes, missing brackets, and truncated LLM output.
JavaScript Playground: Run JS Code Online
Write and run JavaScript in your browser with zero setup. Learn how the sandboxed playground works.
Docker Run to Compose: Convert Commands to YAML
Learn why Docker Compose beats long docker run commands and how to convert any command to a compose file instantly.
Certificate Decoder: How to Inspect SSL/TLS Certificates
Learn how SSL/TLS certificates work, what PEM encoding contains, and how to decode certificates to inspect subject, issuer, SANs, and validity.
Code Screenshot: Turn Code into Beautiful Shareable Images
Create polished code screenshots with syntax highlighting, themes, and custom styling for social media, docs, and presentations.
Cron Expression Builder: Create Schedules Without Memorizing Syntax
Build cron expressions visually with a point-and-click interface. Preview upcoming runs and generate crontab-ready syntax.
Env Editor: Edit .env Files Safely with Validation
Edit environment files with a structured interface that catches syntax errors, validates keys, and keeps your configuration clean.
HTTP Header Analyzer: Inspect and Debug Response Headers
Analyze HTTP response headers for security, caching, and performance issues. Identify missing headers and get actionable recommendations.
Regex Cheat Sheet: The Complete Quick Reference for Developers
A searchable reference covering character classes, quantifiers, anchors, groups, and lookarounds. Find the regex syntax you need in seconds.
Diff Checker: Compare Text and Code Side by Side
Learn how to compare two texts instantly, spot every insertion and deletion, and use diff views effectively for code reviews and content editing.
Mermaid Preview: Render Diagrams from Text in Real Time
Design flowcharts, sequence diagrams, and more using Mermaid syntax with a live preview. Export as SVG or PNG for documentation.
JSON Data Validator: Check Syntax and Structure Instantly
Validate JSON for syntax errors with precise line and column reporting. Catch trailing commas, unquoted keys, and structural issues before they reach production.
Color Converter: HEX, RGB, HSL — Convert Any Color Format
Color formats vary by tool and context. Learn the differences between HEX, RGB, HSL, and how to convert.
Case Converter: camelCase, snake_case, PascalCase and More
Different coding conventions use different case styles. Learn all the formats and convert between them instantly.
URL Encoding & Decoding: Make URLs Web-Safe Instantly
Special characters break URLs. Learn how percent-encoding works and when to encode or decode your strings.
HTML Entity Encoding: Prevent XSS and Display Special Characters
Unescaped HTML is a security risk. Learn how entity encoding protects your site and renders special characters.
Slug Generator: Create SEO-Friendly URLs From Any Text
Clean URL slugs improve SEO and readability. Learn what makes a good slug and how to generate them.
Unix Timestamp Converter: Human Dates ↔ Epoch Time
Unix timestamps are standard in programming but hard to read. Learn to convert between epoch and human dates.
Number Base Converter: Binary, Hex, Octal & Custom Bases
Learn how number base conversion works and convert between binary, decimal, hexadecimal, and any base instantly.
Date Calculator: Find Days Between Dates & Add/Subtract Days
Learn how date calculations work and find the difference between dates, add days, and determine weekdays instantly.
JSON to YAML Converter: Transform Data Formats Instantly
Learn how to convert between JSON and YAML formats, understand the differences, and transform data losslessly.
How to Convert JSON to TypeScript Interfaces
Generate TypeScript interfaces or type aliases from any JSON structure automatically.
Byte Converter: Convert Data Sizes Instantly
Convert between bytes, kilobytes, megabytes, gigabytes, and more. Understand the difference between decimal (SI) and binary (IEC) units.
Aspect Ratio Calculator: Find Perfect Dimensions
Calculate aspect ratios, find missing dimensions, and explore common presets for video, photography, and web design.
Text to Binary: How Character Encoding Really Works
Understand how text is converted to binary, hexadecimal, octal, and ASCII. A practical guide for developers and students.
Morse Code: History, How It Works & Translator Guide
Learn Morse code basics, the international alphabet, and how to translate text to dots and dashes with audio playback.
Duplicate Line Remover: Clean Up Text Data Instantly
Learn how to remove duplicate lines from text, logs, and data exports to get clean, unique content.
Line Sorter: Alphabetize and Organize Text Lines Instantly
Learn how to sort text lines alphabetically, numerically, or in reverse order for clean, organized data.
Text Reverser: Reverse Strings, Words, and Lines Online
Learn how to reverse text by characters, words, or lines for data processing, puzzles, and encoding tasks.
XML to JSON Converter: Transform XML Data Instantly
Learn how to convert XML documents to JSON format, understand the structure mapping, and handle attributes, arrays, and nested elements.
YAML to JSON Converter: Transform YAML Data Instantly
Learn how to convert YAML files to JSON format, understand the syntax differences, and handle common conversion scenarios.
Markdown to HTML Converter: Transform Markdown Instantly
Learn how to convert Markdown to clean HTML, understand the syntax mapping, and handle common formatting scenarios.
HTML to Markdown Converter: Transform HTML Content Instantly
Learn how to convert HTML to clean Markdown, preserve formatting, and handle tables, links, and nested elements.
Unit Converter: Length, Weight, Temperature & More
Convert between metric and imperial units instantly. Learn about unit categories, conversion formulas, and precision handling.
Age Calculator: Exact Age in Years, Months & Days
Calculate your exact age in years, months, days, and more. Discover your zodiac sign, birth weekday, and next birthday countdown.
BMI Calculator: Calculate Your Body Mass Index
Calculate your BMI instantly with metric or imperial units. Understand BMI categories, health implications, and limitations.
Tip Calculator: Calculate Tips & Split Bills Easily
Calculate tips instantly, split bills among friends, and learn tipping etiquette for different countries and situations.
Scientific Calculator: Trig, Log, Powers & More
Use our free online scientific calculator for trigonometry, logarithms, exponents, and more. Supports degrees/radians and expression history.
Discount Calculator: Compute Sale Prices and Percentage Savings
Calculate discounts quickly. Learn about stacking discounts, reverse calculations, and smart shopping math.
Roman Numeral Converter: Rules, Conversion, and Common Uses
Convert between Roman and Arabic numerals. Learn the rules, subtractive notation, and where Roman numerals are still used.
Number to Words: Converting Digits to Written Form in Multiple Languages
Convert numbers to words in English, French, Spanish, and more. Learn about language-specific rules and use cases.
Compound Interest Calculator: Understand How Your Money Grows
Learn the compound interest formula, compare compounding frequencies, and project investment growth over time.
Loan Calculator: Understand Amortization and Monthly Payments
Calculate loan payments, understand amortization schedules, and learn how interest affects total cost.
JSON to XML: Convert Data Formats Easily
Convert JSON to XML with proper formatting and configurable root elements.
Text to Hex Converter: Encode and Decode Hexadecimal
Convert text to hexadecimal representation and back with various encoding options.
CSV to Markdown Table: Format Data for Documentation
Convert CSV data into beautifully formatted Markdown tables for README files and docs.
NATO Phonetic Alphabet: Spell It Out Clearly
Convert text to NATO phonetic alphabet for clear voice communication over radio or phone.
Time Zone Converter: Convert Times Across the World
Convert date and time between any two time zones with automatic DST handling.
Salary Calculator: Convert Between Pay Periods
Convert salary between hourly, daily, weekly, monthly, and annual amounts instantly.
Margin Calculator: Profit Margin and Markup Made Easy
Calculate profit margin, markup percentage, cost, and revenue from any two values.
VAT Calculator: Add or Remove VAT Instantly
Calculate VAT-inclusive and VAT-exclusive prices with any tax rate.
Punycode Converter: Internationalized Domain Names
Convert between Unicode and Punycode for international domains.
TOML to JSON Converter: Bidirectional Format Conversion
Convert between TOML and JSON configuration formats.
HTML to Text: Extract Clean Text from HTML
Strip tags and entities to get clean plain text from HTML.
TSV to CSV Converter: Tab to Comma Conversion
Convert between tab-separated and comma-separated formats.
Image to ASCII Art: Convert Pictures to Text Art
Transform images into ASCII and Unicode character art.
Binary Calculator: Bitwise Operations Explained
Perform binary arithmetic and bitwise operations across number bases.
HTML to JSX: The Complete Conversion Guide for React
Learn why HTML needs conversion for React, what gets transformed, and common gotchas when migrating HTML to JSX.
JSON to SQL Converter: Generate INSERT Statements
Convert JSON arrays to SQL INSERT statements for MySQL, PostgreSQL, and SQLite with type detection.
How to Convert JSON to Python Classes
Generate Python dataclasses, TypedDicts, or dict literals from any JSON structure automatically.
How to Convert JSON to Go Structs
Generate idiomatic Go structs with json tags, type inference, and pointer types from JSON data.
How to Convert JSON to Java Classes
Generate Java POJOs, Lombok classes, or Java 14+ records from JSON data with Jackson annotations.
How to Convert JSON to Kotlin Data Classes
Generate Kotlin data classes with null safety, serialization annotations, and Android-ready patterns.
How to Convert JSON to Dart Model Classes
Generate Flutter-ready Dart classes with fromJson/toJson factories, null safety, and nested model support.
JSON to C#: Generate .NET Classes from API Responses
Generate strongly-typed C# classes and records from JSON with PascalCase naming and serialization attributes.
JSON5 to JSON Converter: Clean Up Config Files Easily
JSON5 adds comments, trailing commas, and more to JSON. Learn where it is used and how to convert it to standard JSON.
Color Name Finder: Match Any Color to Its Closest Name
Finding the right color name improves design communication. Learn how color matching works and explore CSS named colors.
Electricity Cost Calculator: Estimate Your Energy Bill
Calculate how much any appliance costs to run. Enter wattage, usage hours, and your rate to see daily and monthly costs.
Fuel Cost Calculator: Estimate Trip Gas Expenses
Calculate fuel costs for any trip. Enter distance, fuel efficiency, and gas price to get a total cost estimate.
GPA Calculator: How to Compute Your Grade Point Average
Learn how GPA is calculated, understand weighted vs unweighted averages, and project your academic standing.
Text to ASCII Table: Generate Plain-Text Tables from Data
Convert delimited data into formatted ASCII tables for terminals, code comments, and plain-text documents.
Tailwind to CSS: Convert Utility Classes to Standard CSS
Convert Tailwind utility classes to vanilla CSS. See what each class does and learn when to use plain CSS.
HTML Table Generator: Build Accessible Tables Visually
Generate semantic HTML tables with a visual editor. Configure rows, columns, headers, and export clean markup.
CSV Viewer: Open and Inspect CSV Files Without Excel
You don't need Excel to read CSV files. Learn how to open, inspect, and analyze CSV data in your browser.
CSV to JSON Converter: Transform Tabular Data in One Click
APIs expect JSON, spreadsheets produce CSV. Learn how to convert tabular data to structured JSON instantly.
JSON to CSV: Export Structured Data as a Spreadsheet
JSON data is great for APIs but hard to analyze in spreadsheets. Learn how to flatten and export it as CSV.
Excel Reader: View XLSX Files Directly in Your Browser
No Excel license? No problem. Learn how to open and inspect XLSX spreadsheet files directly in your browser.
Excel to CSV: Convert Spreadsheets to Universal Format
CSV is the universal data exchange format. Learn how to convert Excel spreadsheets to CSV without software.
CSV Diff: Compare Two CSV Files and Find Every Difference
Data pipelines can introduce subtle errors. Learn how to compare two CSV files and surface every change.
PDF Tools: How to Merge, Split & Compress PDFs in Your Browser
Learn how to merge, split, and compress PDF files using client-side tools — no upload required.
CSV to SQL: Convert Spreadsheet Data to Database INSERT Statements
Transform CSV files into SQL CREATE TABLE and INSERT statements with automatic column type detection.
JSON Flatten: Convert Nested to Flat and Back
Flatten nested JSON to dot-notation and unflatten flat paths back to nested objects.
File Hash Checker: Verify File Integrity
Compute MD5, SHA-1, SHA-256, and SHA-512 checksums for any file entirely in your browser.
CSV to JSONL Converter: Create JSON Lines Files
Convert CSV data to JSON Lines format for streaming, BigQuery imports, and machine learning datasets.
SQL to CSV Converter: Extract Data from SQL Dumps
Convert SQL INSERT statements to CSV format. Extract data from database dumps for spreadsheets and analysis.
Password Generator: Create Unbreakable Passwords Instantly
Strong passwords are your first line of defense. Learn what makes a password secure and how to generate one.
UUID Generator: Create Unique Identifiers for Any Project
UUIDs are the standard for unique IDs in modern software. Learn the different versions and when to use each.
Random Number Generator: Truly Unbiased Numbers Online
Not all random is equal. Learn the difference between pseudo-random and cryptographically secure randomness.
Lorem Ipsum Generator: Placeholder Text for Any Design
Every designer uses Lorem Ipsum. Learn its history, variations, and how to generate the right amount fast.
QR Code Generator: Create Scannable Codes in Seconds
QR codes bridge physical and digital worlds. Learn how they work and how to generate them for any use case.
Word Counter: How to Count Words, Characters & Reading Time
Learn how word counting works and how to analyze text length, character count, and reading time instantly.
Percentage Calculator: How to Calculate Percentages Instantly
Learn how percentage calculations work and calculate discounts, increases, and ratios instantly.
How to Generate Barcodes Online
Create barcodes in CODE128, EAN-13, UPC-A, and more — download as PNG or SVG.
How to Generate Mock Data for Testing
Learn to create realistic fake data for development and testing — names, emails, addresses, and more.
CSS Gradient Generator: Create Beautiful Gradients Visually
Learn how to create stunning CSS gradients with our visual builder. Linear, radial, and conic gradients with color stops and presets.
Box Shadow Generator: Design CSS Shadows Visually
Build complex CSS box shadows with a visual editor. Multiple shadow layers, presets, and instant CSS output.
Color Palette Generator: Build Harmonious Color Schemes
Generate beautiful color palettes using color harmony rules. Complementary, analogous, triadic, and split-complementary schemes.
How to Write a Privacy Policy: A Complete Generator Guide
Generate a GDPR and CCPA compliant privacy policy for your website. Step-by-step guide with our free generator.
Word Frequency Counter: Analyze Text for Keyword Density and Patterns
Count word occurrences in any text. Learn about frequency analysis, stop words, and content optimization.
List Randomizer: Shuffle Items Fairly with Fisher-Yates Algorithm
Randomize any list of items with a proven fair algorithm. Learn about shuffling, sampling, and random ordering.
Crontab Generator: Build Cron Expressions for Scheduled Tasks
Master cron syntax for scheduling recurring tasks. Learn common patterns, pitfalls, and debugging tips.
robots.txt Generator: Control Search Engine Crawling for Your Site
Learn robots.txt syntax, create rules for search engines and AI crawlers, and avoid common SEO mistakes.
.gitignore Generator: Create the Perfect Ignore File
Generate a .gitignore file from curated templates for any language or framework.
Placeholder Image Generator: Custom Sizes and Colors
Generate placeholder images with custom dimensions, colors, text, and format.
Color Shades Generator: Tints, Shades, and Tones
Generate a full palette of tints, shades, and tones from any base color.
DMARC Generator: Protect Your Email Domain
Generate a DMARC DNS record to prevent email spoofing and improve deliverability.
SPF Generator: Authorize Email Senders
Generate an SPF DNS record to specify which servers can send email for your domain.
Terms of Service Generator: Create Legal Pages Fast
Generate a Terms of Service document with configurable company details and clauses.
Sitemap XML Generator: Improve Search Engine Indexing
Create valid sitemaps to help search engines discover your pages.
.htaccess Generator: Apache Configuration Made Easy
Build .htaccess rules for redirects, caching, and security.
UTM Link Builder: Track Campaign Performance
Build UTM-tagged URLs for Google Analytics campaign tracking.
Text to ASCII Art: Create ASCII Banners and Signs
Generate eye-catching text banners with figlet-style fonts.
HTTP Security Headers: Protect Your Website
Configure essential security headers for your web server.
README Generator: Create Professional Project Documentation
Generate well-structured README.md files for your projects.
JSON Schema Generator: Create Schemas from Examples
Generate JSON Schemas automatically from sample data.
Pomodoro Timer: Boost Productivity with Focus Sessions
Use the Pomodoro technique to manage work and break intervals.
Fancy Text Generator: Unicode Styles for Social Media
Learn what Unicode text variants are, how to generate bold, italic, and script text, and where to use fancy text online.
WiFi QR Code Generator: Share WiFi Instantly
Create a QR code for your WiFi network. Guests scan and connect automatically without typing passwords.
ICS Generator: Create Calendar Event Files That Work Everywhere
ICS files are the universal format for sharing calendar events. Learn how to create them with reminders and recurrence.
CSS Text Shadow: Create Stunning Text Effects
Build neon glow, embossed, and 3D text effects with CSS text-shadow using visual controls.
CSS Filters: Visual Effects for Images and Elements
Create blur, brightness, contrast, and Instagram-style photo effects with the CSS filter property.
CSS Border Radius: Rounded Corners, Circles, and Shapes
Create rounded corners, pill shapes, circles, and complex organic shapes with CSS border-radius.
Cubic Bezier Generator: CSS Animation Easing Made Visual
Cubic bezier curves control how CSS animations feel. Learn how control points shape motion and create custom easing.
Dockerfile Generator: Create Optimized Container Images
Generate production-ready Dockerfiles with multi-stage builds, proper layer caching, and security best practices.
Nginx Config Generator: Build Server Configurations
Create Nginx server blocks for reverse proxy, static hosting, SSL termination, and load balancing with valid syntax.
SSH Key Generator: Create Ed25519, ECDSA & RSA Keys
Generate SSH key pairs in your browser. Learn about key types, security best practices, and how to deploy public keys.
RSA Key Generator: Create RSA Key Pairs Online
Generate RSA key pairs in PEM or JWK format. Understand key sizes, output formats, and when to use RSA encryption.
CSS Glassmorphism Generator: Create Frosted Glass Effects
Generate beautiful frosted-glass CSS with live preview. Adjust blur, opacity, and borders to create modern glassmorphism panels for your UI.
CSS Loader Generator: Create Pure CSS Loading Animations
Generate customizable CSS spinners, dots, and bar loaders. Copy production-ready code with keyframe animations.
Email Template Builder: Design Cross-Client HTML Emails
Build HTML email templates that render correctly in Gmail, Outlook, and Apple Mail. Visual editor with table-based output.
Image Compression: Reduce File Size Without Losing Quality
Learn how lossy and lossless compression work, and how to shrink images instantly in your browser.
Image Resizing: Change Dimensions with Lanczos3 Quality
Resize images to exact pixel dimensions or percentages using high-quality Lanczos3 resampling.
Image Format Conversion: PNG, JPEG, and WebP Explained
Convert images between PNG, JPEG, and WebP. Learn when to use each format for optimal results.
Image Cropping: Interactive Crop with Aspect Ratio Presets
Crop images with interactive controls and preset aspect ratios for profile photos, thumbnails, and social media.
Background Removal: AI-Powered, Private, and Free
Remove image backgrounds with AI running entirely in your browser. No upload, no signup required.
Image to PDF: Combine Images Into a PDF Document
Learn how to merge multiple images into a single PDF with custom page size, orientation, and margins.
PNG to JPG: Convert PNG Images to JPEG Online
Learn the differences between PNG and JPEG, and convert PNG images to smaller JPEG files instantly.
JPG to PNG: Convert JPEG to Lossless PNG Online
Learn why and when to convert JPEG images to lossless PNG format for editing and archiving.
Image to WebP: Convert Any Image to WebP Format
Learn about the WebP format and convert images to WebP with lossy or lossless compression.
Image to Base64: Encode Images as Base64 Strings
Learn what Base64 image encoding is, when to use it, and encode any image to a Data URI.
Add Watermark to Images: Text & Image Overlays
Learn how to add text or image watermarks to photos with adjustable opacity, position, and tiling.
Rotate & Flip Images: 90°, 180°, Custom Angle
Rotate images by any angle and flip them horizontally or vertically — free, in your browser.
Blur Images: Gaussian Blur & Pixelation Effects
Blur photos with Gaussian smoothing or pixelation effects for privacy, censoring, or design.
Favicon Generator: Create Icons for Every Browser
Generate favicons in all standard sizes from a single image with ready-to-use HTML and manifest code.
Pick Colors from Any Image: HEX, RGB & HSL
Click any pixel to extract its color in HEX, RGB, and HSL formats — build palettes from photos.
Color Palette Extractor: Pull Colors from Any Image
Extract dominant colors and full palettes from any image. Learn how the palette extractor works and when to use it.
SVG to PNG Converter: Convert Vector to Raster Online
Convert SVG vector files to high-quality PNG images at any resolution. Learn why and when to convert SVG to PNG.
HEIC to JPG Converter: Convert Apple Photos Online
Convert HEIC and HEIF photos from iPhone to universally compatible JPG or PNG. Learn about the HEIC format and conversion options.
GIF to PNG Converter: Extract Static Frame from GIF
Convert GIF images to high-quality static PNG files. Learn when and why to extract frames from animated GIFs.
Image Metadata Viewer: Read EXIF, IPTC, XMP Data
View complete image metadata including EXIF camera settings, GPS coordinates, and editing history. Learn what metadata reveals about your photos.
Color Blindness Simulator: Design for Accessibility
Test how your designs appear to people with color vision deficiencies.
Image Flip: Mirror Images Horizontally & Vertically Online
Learn what image flipping does, how to flip photos horizontally or vertically, and practical use cases for mirroring images.
Image Noise Generator: Create Grain and Texture Effects
Generate customizable noise textures for web backgrounds, graphic design, and image processing experiments.
Image Grayscale and Sepia: Convert Photos to Monochrome
Learn how grayscale, sepia, and custom tint effects work and when to use monochrome image conversion.
Image Color Invert: Full, Channel, and Luminosity Modes
Learn how color inversion works across full, per-channel, and luminosity modes for creative and practical effects.
Image Posterize: Reduce Colors for Bold Poster Effects
Learn how posterization reduces color levels to create pop art, flat design, and screen print effects.
Image Pixelate: Block Mosaic for Privacy and Retro Art
Learn how pixelation creates mosaic effects for privacy censoring, retro aesthetics, and creative design.
Image Adjustments: Brightness, Contrast, Saturation Controls
Learn how brightness, contrast, saturation, hue, and temperature sliders correct and enhance photographs.
Image Sharpen: Enhance Detail with Unsharp Mask
Learn how unsharp mask sharpening enhances image detail and clarity with adjustable radius and amount.
Image Duotone: Two-Color Photo Mapping Effects
Learn how duotone effects map image luminance to two colors for bold, branded visual styles.
Image Gradient Map: Multi-Stop Color Tone Mapping
Learn how gradient mapping recolors images by mapping luminance to custom multi-stop color gradients.
Image Color Replace: Selective Recoloring with Tolerance
Learn how to replace specific colors in images using click-to-sample and adjustable tolerance matching.
Image Halftone: Dot Pattern and CMYK Print Effects
Learn how halftone dot patterns create print-style effects with circle, square, and diamond shapes.
Image Dithering: Floyd-Steinberg and Retro Pixel Effects
Learn how dithering algorithms simulate colors with limited palettes for retro computing aesthetics.
Image Glitch: Chromatic Aberration and Digital Distortion
Learn how glitch effects like chromatic aberration, scan lines, and data bending create digital art.
Screenshot Beautifier: Device Frames and Gradient Backgrounds
Learn how to wrap screenshots in browser, macOS, and mobile device frames with attractive backgrounds.
Image Border Generator: Solid and Gradient Frames
Learn how to add solid color or gradient borders with configurable width and padding to any image.
Image Round Corners: Per-Corner Radius with Transparency
Learn how to round image corners with independent per-corner control and transparent PNG export.
Image Shadow Generator: Drop Shadow with Transparent Export
Learn how to add customizable drop shadows with offset, blur, spread, and color to any image.
Image Text Overlay: Multi-Layer Typography on Photos
Learn how to add styled text layers with font, color, rotation, and shadow controls to images.
OG Image Generator: Social Media Preview at 1200x630
Learn how to generate Open Graph images for social media link previews with custom titles and backgrounds.
Image Overlay Blend: Multiply, Screen, and More Modes
Learn how blend modes combine two images with effects like multiply, screen, overlay, and soft light.
Aspect Ratio Crop: Precise 16:9, 4:3, 1:1 Cropping
Learn how aspect ratio cropping locks images to exact proportions for social media, video, and print.
Image Collage Maker: Grid Layouts with Custom Spacing
Learn how to create photo collages with grid layouts from 2x1 to 3x3 and customizable gaps.
Image Grid Splitter: Split into Tiles with ZIP Download
Learn how to split images into grid tiles from 2x2 to 10x10 for Instagram grids and print production.
CSS Sprite Sheet Generator: Combine Images with CSS Code
Learn how to create sprite sheets with auto-generated CSS background-position code for web optimization.
Image Comparison Slider: Interactive Before-After Viewer
Learn how to compare two images with an interactive before-after slider in horizontal or vertical mode.
EXIF Stripper: Remove Photo Metadata for Privacy
Learn how EXIF stripping removes GPS coordinates and camera data to protect your privacy when sharing photos.
Image Filters: One-Click Effects with Live Previews
Learn how image filter presets apply combined adjustments for quick photo styling with visual thumbnails.