Online Validators

Check if an email address is real and deliverable — syntax, domain, and MX record checks in one click.

Paste any IBAN and instantly verify its checksum, format, and bank identification — before sending a payment.

Verify a BIC or SWIFT code to confirm the bank and country before an international transfer.

Validate any phone number worldwide, identify the country and carrier, and confirm the correct format.

Look up and verify any EU VAT number against the VIES database to confirm a business is registered.

Verify and standardize postal addresses across 240+ countries to make sure they actually exist.

Parse, validate, and inspect URLs — check protocol, domain, path, and query parameters.

Validate IPv4 and IPv6 addresses, check ranges, subnets, and geolocation data.

Test password strength in real-time — entropy, common patterns, and breach database checks.

Validate, format, and convert between JSON, YAML, and XML with instant syntax highlighting.

Upload a CSV file and run sequential validation checks — encoding, headers, rows, quoting, and data types.

Verify card numbers using the Luhn algorithm and detect card type.

Validate YAML syntax with line-level error reporting.

Validate HTML markup for syntax errors, unclosed tags, and deprecated elements.

Check CSS syntax for property errors, unclosed brackets, and malformed selectors.

Validate XML documents for well-formedness, unclosed tags, and encoding issues.

Check SQL query syntax with support for MySQL, PostgreSQL, and SQLite dialects.

Validate Markdown syntax for broken links, unclosed emphasis, and formatting issues.

Validate UUID format, detect version (v1-v5), variant, and identify nil/max UUIDs.

Verify ISBN-10 and ISBN-13 check digits and convert between formats.

Validate EAN-8, EAN-13, and UPC-A barcode numbers with check digit verification.

Validate MAC address format and look up the vendor via OUI database.

Validate semantic version strings per semver.org spec and compare versions.

Validate domain names for RFC compliance with IDN and punycode support.

Validate postal/ZIP codes against country-specific format patterns.

Verify 15-digit IMEI numbers with Luhn check digit validation.

Validate Vehicle Identification Numbers with check digit, manufacturer, and year decode.

Validate International Securities Identification Numbers with Luhn check digit.

Verify International Standard Serial Numbers with modulo-11 check digit.

Validate Legal Entity Identifiers with MOD 97-10 check digit verification.

Validate dates and times in ISO 8601, RFC 2822, Unix timestamp, and more formats.

Validate HEX, RGB, HSL, and HWB color codes with preview swatch.

Validate JSON Lines format with per-line error reporting and statistics.

Look up MIME types by file extension or find extensions for a MIME type.

Validate Content Security Policy headers with security risk detection.

Validate robots.txt files for syntax errors and directive conflicts.

Validate XML sitemaps for schema compliance, URLs, and metadata.

Validate JWT tokens for structure, claims, expiration, and algorithm.