Diff Checker

Paste two texts; compare them line by line. Added and removed lines are shown both marked and colored in a single unified view.

Runs 100% in your browser — your texts are never sent anywhere.
Enter two texts and click Compare to see the difference.

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Frequently Asked Questions

It finds the line-by-line difference between two texts or pieces of code: it shows which lines were added and which were removed. Useful for reviewing code changes, comparing contract/text revisions, or quickly seeing the difference between two versions of a file.

It works smoothly on texts up to a few thousand lines. Since the comparison runs entirely in your browser using your own device's processor, very large files (tens of thousands of lines) may take longer to compute and the tab may slow down temporarily — in that case, it's recommended to split the text and compare it in chunks.

No. The comparison, including the jsdiff library that computes the differences, runs entirely in your browser; the text you paste is never sent to any server.

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