Compare anything. Miss nothing.
Diff text, code, JSON, spreadsheets, images, and documents side by side, in your browser. Nothing uploads unless you share it.
Diffing, done properly.
Split and unified views, precision control, syntax highlighting, and per-chunk merging, live as you type.
Split & unified views
Compare side by side or in a single unified stream, and switch anytime.
Live as you type
Every keystroke re-runs the diff instantly. No button to press.
Word, line, or character precision
Zoom into exactly the level of change that matters.
Ignore whitespace, case, or regex
Filter out the noise before you filter out the signal.
Per-chunk merge & revert
Pull a change from either side without leaving the editor.
Export a unified patch
Copy or download a .patch file ready for git apply.
Built around how you actually work.
Review code without leaving the browser.
Paste two versions of a file, or drop them in, and get syntax-highlighted, per-chunk diffs with word-level precision.
- 40+ languages recognized automatically
- Unified patch export for git apply
- Ignore regex-matched noise like timestamps and UUIDs
Five ways to compare.
Bring whatever you're working with.
Text, code, JSON, spreadsheets, images, and documents are ready today.
Common questions.
Does anything get uploaded?
No. Every diff runs in your browser using JavaScript. Nothing is sent anywhere unless you explicitly choose to share a link.
What's the difference between word, line, and character precision?
Line precision highlights whole changed lines, word precision highlights individual words, and character precision zooms in to the exact letters that changed.
Can I ignore things like timestamps or whitespace?
Yes. Turn on ignore whitespace or ignore case, or supply a regular expression, and matching text is excluded from the comparison entirely.
Which languages get syntax highlighting?
Over 40, including JavaScript, TypeScript, Python, Go, Rust, Java, SQL, and YAML, detected automatically from the file name.
Is DiffLab free?
Yes. There's no account, no paywall, and no limit on how many diffs you run.