Text Diff Checker

Compare text online to find additions, removals, and changed lines. Load plain-text files, copy the unified diff, or download the diff for review. This browser-based diff checker works for documents, code snippets, Markdown, JSON, emails, configuration files, and revision reviews.

How to compare text

  1. Paste the original text into the first editor.
  2. Paste the changed text into the second editor.
  3. Load text files or paste content into both editors.
  4. Choose options like ignore whitespace or case.
  5. Review, copy, or download the side-by-side or unified diff output.

Side-by-side and unified diff

Side-by-side diff makes visual comparison easy. Unified diff is compact and useful when you need to copy a review-friendly change summary.

Private text comparison

Your text is compared locally in this browser. There is no backend and no analytics. AdSense may show a consent prompt for ads.

Example diff

- old heading text + updated heading text unchanged paragraph text