Developer Tools
Diff Checker
Compare two texts and highlight the differences line by line.
Free foreverRuns in your browserNo sign-up
About the Diff Checker
Paste or upload two versions of any text or code and instantly see what changed, with additions and removals highlighted line by line and word by word.
Switch between a side-by-side split view and a combined unified view, ignore whitespace or letter case, and jump between changes with previous and next.
Everything runs in your browser, so your files are never uploaded, making it safe for private code, configs and documents.
Key features
- Side-by-side split view and unified view
- Line and word level highlighting
- Open a file or paste text directly
- Ignore whitespace or case, jump between changes
How to use
- 1Paste or open a file in the Original and Changed boxes.
- 2Click Find difference to compare them.
- 3Use Previous and Next to move between changes.
Frequently asked questions
- Are my files uploaded anywhere?
- No. The comparison runs entirely in your browser, so your text and files never leave your device.
- What is the difference between split and unified view?
- Split view shows the original and changed text side by side in two columns. Unified view combines them into a single column with plus and minus markers, like a code review diff.
- Can I compare code and JSON?
- Yes. It works with any plain text including code, JSON, CSV, YAML and configuration files, and highlights the exact words that changed.