Free developer tools

A growing toolbox of encoders, hashes, generators, validators and converters — every one runs entirely in your browser, nothing is uploaded. Need them as an API? Pick a tool to learn more.

Encoding & Crypto

Base64, hashing, HMAC, JWT and checksums.

Base64 Encode / Decode URL Encode / Decode HTML Entity Encode / Decode Hex Encode / Decode Base58 Encode / Decode Base32 Encode / Decode Hash Generator (MD5, SHA-1, SHA-256)HMAC Generator CRC32 Checksum JWT Decoder JWT Verifier (HS256/384/512)

Generators

UUIDs, passwords, tokens, IDs and placeholder text.

UUID Generator (v4)ULID Generator Nano ID Generator Password Generator Random Token / API Key Generator Lorem Ipsum Generator

Text

Slugs, case conversion, stats and similarity.

Slugify — URL Slug Generator Case Converter Word & Character Counter Levenshtein Distance Calculator

Validators

Cards, IBAN, email, barcodes and identifiers.

Credit Card Validator IBAN Validator Email Validator EU VAT Number Validator SWIFT / BIC Validator ABA Routing Number Validator Crypto Address Validator ISBN Validator EAN / UPC Barcode Validator IMEI Validator ISIN Validator URL Validator & Parser IP Address Validator Postal Code Validator UUID Validator

Convert & Calculate

Units, colour, dates, cron, geo and lookups.

Unit Converter Data Size Converter Number Base Converter Roman Numeral Converter Number to Words Converter Unix Timestamp Converter Date Difference Calculator Age Calculator Cron Expression Parser Color Converter (HEX, RGB, HSL)Color Contrast Checker (WCAG)Distance Between Coordinates Geohash Encoder / Decoder HTTP Status Code Lookup MIME Type Lookup

Network & DNS

DNS records, SPF and DMARC checks.

DNS Lookup SPF Record Checker DMARC Record Checker

Validate IBANs by country

Dedicated pages with the exact length, structure and a valid example IBAN for all 79 IBAN countries. Browse IBAN by country →