🔀 Text Diff Checker
Paste an original and a changed version to get a line-by-line diff, with additions in green and deletions in red. Optionally ignore whitespace or letter case. Everything is compared in your browser.
🔒 Runs 100% in your browser. Your data never leaves your device.
How to use
- Paste the original text on the left and the changed text on the right.
- The diff appears below: green lines were added, red lines were removed.
- Turn on ‘Ignore whitespace’ or ‘Ignore case’ if those differences do not matter.
FAQ
How is the diff computed?
With a longest-common-subsequence algorithm on lines — the same idea behind git diff. Very large inputs are trimmed to 4,000 lines so your browser stays responsive.
Is my text uploaded?
No. Both texts are compared entirely in your browser and never sent to a server.
Can it diff word by word?
Not yet — this compares line by line, which is what you want for code, config files and documents.