Compare two texts and highlight the added and removed lines, instantly and in your browser.
How to use the Diff Checker
Paste the original text on the left and the changed text on the right.
Optionally ignore case or whitespace differences.
Read the line-by-line diff: green is added, red is removed.
Frequently asked questions
It compares the two texts line by line using a longest-common-subsequence diff, the same approach Git uses, so you get the smallest set of changes.
No. The comparison runs entirely in your browser; nothing is sent to a server.
Yes. Line-based diffing works well for source code, config files, logs and prose alike.
A text diff checker that compares two blocks of text and shows exactly which lines were added or removed, with optional case and whitespace insensitivity.
Everything runs client-side, so it is fast and private, suitable even for sensitive documents.
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