How it works
The tool finds the longest common sequence of lines and marks everything else as added (+) or removed (−), just like git diff.
Is my data safe?
Yes. Everything runs in your browser. Nothing you paste here is sent to any server.
Text diff checker
Paste the original on the left and the changed version on the right.
More to try
JSON Formatter
Format, validate and minify JSON with clear error messages.
Base64 Encode / Decode
Encode or decode Base64 with full UTF-8 support. Files to data URLs too.
URL Encode / Decode
Percent-encode or decode URLs and see every query parameter.
UUID Generator
Generate UUID v4 or time-ordered v7 in bulk.
Unix Timestamp Converter
Convert epoch seconds or milliseconds to dates and back.
Hash Generator
MD5, SHA-1, SHA-256, SHA-512 hashes of text or files.
JWT Decoder
Decode a JSON Web Token's header and payload, check expiry.
Regex Tester
Test JavaScript regular expressions with live highlighting and groups.
Color Converter
Convert HEX, RGB and HSL, and check contrast on white or black.
Password Generator
Strong random passwords with the options you need.