Free Text Diff Checker Online
Compare two blocks of text and see added, removed, and unchanged lines highlighted. Runs in your browser - no upload.
How to use
- 1
Paste your original text
Enter the first version of your text in the left panel.
- 2
Paste your modified text
Enter the updated version in the right panel.
- 3
See the diff highlighted
Added lines are shown in green, removed lines in red, and unchanged lines in grey.
Why use this tool?
- Line-by-line diff with clear colour coding
- Runs entirely in your browser - documents never leave your device
- Handles large texts efficiently
- Ideal for comparing code, documents, config files, and articles
Frequently asked questions
- Is my text sent to a server?
- No. The diff is computed entirely in your browser using a JavaScript diff library. Nothing is uploaded.
- What kind of diff does it show?
- A line-by-line diff. Each line is classified as added (green), removed (red), or unchanged (grey).
- Can I compare code?
- Yes, any plain text works including code, prose, config files, and JSON.
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