Diff Checker
Compare two texts, line by line.
Runs entirely in your browser — nothing you enter is uploaded, logged, or tracked.
Paste two versions of any text to see exactly what changed — additions and deletions highlighted line by line, computed locally with a real diff algorithm and no upload or size limits.
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Frequently asked questions
Is there a size limit or paywall?
No. Unlike many diff sites, there’s no character cap, no account, and no upload — the comparison runs entirely in your browser, so you can diff anything privately.
How does it decide what changed?
It computes a longest-common-subsequence line diff (the same idea behind git diff), so matching lines line up and only the real additions and removals are flagged.