Diff Checker
Compare two texts line by line with a clear diff view.
developer utilities · client-side · works offline
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Compare two texts online, privately
Paste two versions of any text - code, config, prose, JSON - and this diff checker highlights exactly which lines were added and removed, using the same Myers algorithm that powers git diff. Line numbers for both versions make it easy to trace a change back to its source, and a one-click copy gives you a unified-diff-style summary for a commit message or code review.
Diffing happens entirely in your browser, which matters when you're comparing things you shouldn't paste into random websites: contracts, .env files, API responses with tokens. Nothing is uploaded, nothing is stored, and the tool keeps working offline after the page loads.
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