How does the comparison work?

Text is compared line by line using a longest-common-subsequence algorithm, so unchanged lines stay aligned.

Is there a size limit?

There is no fixed limit, but very large inputs take longer because the diff is computed in your browser.

No. The comparison runs entirely on your device.

Compare two blocks of text line by line and highlight what was added and removed. Runs entirely in your browser — no uploads.

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Paste text into both boxes to see the differences.

Compare two blocks of text line by line and highlight additions and removals — a quick way to spot what changed.