Free Online Diff Tools
Compare data side by side with visual, color-coded diffs. Every tool runs 100% in your browser — nothing is uploaded to any server.
Diff & Compare Tools
Array Diff
Compare arrays and JSON arrays side by side. Works with Python lists, JavaScript arrays, and any JSON-serializable data.
Most PopularJSON Diff
Compare two JSON objects or documents. See added, removed, and changed keys with path-based highlighting.
NewText Diff
Compare plain text, code, or config files line by line. Supports side-by-side and unified views with word-level highlighting.
NewCSV Diff
Compare CSV or TSV files with a table-based view. Supports custom delimiters and key column matching.
NewEncode / Decode / Format
JSON Formatter
Format, beautify, minify, and validate JSON. Customizable indentation with optional key sorting.
NewBase64 Encode/Decode
Encode text to Base64 or decode Base64 back to text. Full UTF-8 support with swap functionality.
NewURL Encode/Decode
Encode URLs with encodeURI or encodeURIComponent. Decode percent-encoded strings back to readable text.
NewJWT Decoder
Decode JSON Web Tokens to view header, payload, and signature. Shows expiry status and human-readable timestamps.
NewAll Tools Are
All processing in your browser. No uploads.
No registration, no limits, no paywalls.
Zero dependencies. Loads and runs instantly.
Works on any device with a modern browser.