Text Diff Checker

Free text diff checker. Compare two text blocks line by line and highlight added and removed lines.

How the Text Diff Checker works

The tool splits both text inputs into arrays of lines and compares them using a longest-common-subsequence (LCS) algorithm. Lines present only in the original are marked as removed (red), lines present only in the modified version are marked as added (green), and matching lines are shown unchanged.

How to use the Text Diff Checker

  1. 1The text diff checker is designed to be simple and fast.
  2. 2Paste the original text.
  3. 3Paste the modified text.
  4. 4See added and removed lines.
  5. 5Your result is shown immediately.

Examples

  • Highlights added lines in green
  • Highlights removed lines in red

Benefits

  • Completely free with no signup required.
  • Runs entirely in your browser for instant results and privacy.
  • Works on mobile, tablet and desktop.
  • Results can be copied with one click.

Frequently Asked Questions

Is the text diff checker free to use?

Yes. The text diff checker is 100% free, with no signup, no watermark and no hidden limits.

Does the text diff checker store my data?

No. All calculations and processing happen locally in your browser. Nothing is uploaded to a server.

Does the text diff checker work on mobile?

Yes. The text diff checker is fully responsive and works on phones, tablets and desktop computers.

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