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Text Diff Checker
Compare two texts and see the differences.
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How to use the Text Diff Checker
- 1Paste your original text into the left box.
- 2Paste the changed text into the right box.
- 3Click Compare to see added, removed, and unchanged lines.
About the Text Diff Checker
Free online text diff checker to compare two texts line by line. Instantly highlight added and removed lines with counts. Fast, private, browser-based.
Part of our Developer Tools collection. Browse all tools.
Frequently asked questions
- How does the diff comparison work?
- It splits both texts into lines and runs a longest common subsequence (LCS) algorithm to find the minimal set of added and removed lines, then shows a unified, color-coded view.
- Is my text uploaded anywhere?
- No. The comparison runs entirely in your browser, so your text never leaves your device.
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