Text Diff Checker
Compare two texts side-by-side and see exactly what changed. Green highlights for additions, red for deletions. Word or line mode.
How to use the Text Diff
Line-by-line diff
The tool compares the two texts line by line. Identical lines show in grey, removed lines (only in A) in red, added lines (only in B) in green. The algorithm finds the longest common subsequence between the two — the same approach Unix diff uses.
Common uses
Comparing two versions of a document, finding what changed in copied-and-pasted email threads, spotting differences in configuration files, reviewing edits to legal text. For source code, your editor probably has a better diff view than this — but this works anywhere, with no software needed.
Frequently asked questions
Is the Text Diff free to use?
Yes, the Text Diff is completely free. There is no sign-up, no account required, and no limit on how often you can use it.
Is my text private when using the Text Diff?
Yes, all text processing happens in your browser. Your text is not sent to any server and is not stored anywhere outside your device.
What devices does the Text Diff work on?
The Text Diff works on any device with a modern web browser — desktop, laptop, tablet, or phone. It is mobile-friendly and works offline once the page has loaded.