// free · runs in your browser · nothing uploaded
Text Diff Checker
Free online diff checker: paste two versions of a text, code or config and see added, removed and changed lines side by side, with options to ignore spaces and case.
📚 Official sources: GNU diffutils
We build every tool from the official rules and re-check them when they change. Always confirm with the official source before you rely on a result.
🛠️ Spotted a mistake or an out-of-date rule? Tell us
Questions people ask
What does a diff checker do?+
It compares two texts line by line and shows which lines were added (green, +) and removed (red, −), the same way git diff does.
Can it ignore spacing changes?+
Yes. Tick “Ignore spaces” to treat lines that differ only in spaces or tabs as the same, and “Ignore case” for upper and lower case.
Is my text uploaded?+
No. The comparison runs in your browser, so it is safe for private code or documents.