Diff Checker
Compare two texts line-by-line with an LCS diff.
Original text
Changed text
Diff result
Line, word or character comparison using LCS
About the Diff Checker
Compare two blocks of text line by line using a longest common subsequence algorithm, viewable as a unified or side-by-side diff, with options to ignore whitespace and case differences.
Examples
Compare lines
line1\nline2Output
line1\nline2 (changed)Keyboard shortcuts
- Copy the main outputCtrl / ⌘ + Shift + C
- Download the resultCtrl / ⌘ + S
- Share this toolCtrl / ⌘ + Shift + S
- Reset the inputsAlt + R
- Open the tool search paletteCtrl / ⌘ + K
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Frequently asked questions
Read more
- Line diff is not enough: word and character diffs for prose, config and JSON
Line-based diffs mark a whole paragraph as changed when one word moved. Word and character granularity, unified patches and side-by-side views each solve a different problem.
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Version 1.0.0 · Updated 2026-08-06 · Runs entirely in your browser