Text & Code Diff Checker Online

Quickly compare two blocks of text, code, or configuration files with visual highlighting of additions, deletions, and modifications. 100% in-browser.

Total Lines: 0 +0 added -0 removed ~0 modified

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How to use

  1. Paste the original text on the left and the modified text on the right (or upload files).
  2. Switch between "Split View (Side-by-Side)" or "Unified View" based on your preference.
  3. Review line additions and deletions, toggle whitespace sensitivity, or swap sides in one click.

FAQ

How does the diff highlighting work?

Additions are highlighted in green with a plus (+), deletions in rose-red with a minus (-), and identical lines remain neutral.

Is it safe to compare confidential source code or keys?

Yes, 100%. The Longest Common Subsequence (LCS) algorithm runs client-side in your browser. No data ever leaves your computer.

What file formats can be loaded?

You can load any plain text files including .txt, .js, .ts, .json, .py, .html, .css, .md, .yml, and .env configs.

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