Text Diff Checker
Paste an old and a new version of any text and see exactly which lines changed - great for essays, code and notes.
Original
Changed
− The quick brown fox + The quick brown cat jumps over the lazy dog
How it works
Paste the original text on the left and the changed text on the right.
Read the highlighted diff - green for added, red for removed.
Spot edits in essays, notes or code without scrolling.
Why use this tool?
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The comparison is line-by-line using a longest-common-subsequence algorithm.
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It runs locally, so your text never leaves the browser.
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Use it for drafts, assignments and config or code snippets.
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Counts of added and removed lines update as you type.
Frequently asked questions
Is this word-level or line-level?
It is line-level: whole changed lines are marked added or removed. Edits within a line show the whole line as changed.
Can I diff code?
Yes - paste two versions and changed lines are highlighted, which is handy for quick config or snippet checks.
Is my text uploaded?
No. The diff is computed in your browser as you type.
Why use this instead of git?
For a quick, sign-up-free check of two pasted snippets without opening a terminal or repo.
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