Developer tools
Free developer utilities that never send your data to a server: JSON formatter, Base64, JWT decoder, regex tester, hash generator, UUID, diff, timestamps and more.
JSON Formatter
Pretty-print, minify, validate and sort JSON, with exact error positions.
Base64 Encode & Decode
Encode text to Base64 or decode it back, with full Unicode and URL-safe support.
URL Encode & Decode
Percent-encode or decode URLs and query values.
Hash Generator
Compute SHA-256, SHA-512, SHA-384 and SHA-1 hashes of text.
UUID Generator
Generate random v4 or time-ordered v7 UUIDs in bulk.
JWT Decoder
Decode a JSON Web Token’s header and claims and see when it expires.
Regex Tester
Test JavaScript regular expressions with match positions and capture groups.
Text Diff
Compare two texts line by line and see what was added or removed.
Case Converter
Convert text to UPPER, lower, Title, camelCase, snake_case and more.
Word Counter
Count words, characters, sentences and reading time as you type.
Timestamp Converter
Convert Unix timestamps and ISO dates, with any time zone.
Color Converter
Convert HEX, RGB and HSL and check contrast ratios against white and black.
Password Generator
Generate strong random passwords with your browser’s secure random source.
QR Code Generator
Create QR codes for links and text; download as PNG or crisp SVG.