Text Diff Checker

Compare two texts and see exactly what changed, line by line

How to use this tool

Follow these steps to compare two blocks of text:

  1. Paste the original text into the left box
  2. Paste the changed version into the right box
  3. Click "Compare Text" to see line-by-line differences
  4. Review the highlighted lines — green for added, red for removed

All comparison happens locally in your browser — neither text is sent anywhere.

Best for these scenarios

This diff checker is particularly useful in these common situations:

  • Editing review — See exactly what an editor or collaborator changed in a document
  • Contract comparison — Spot changes between two versions of an agreement or policy
  • Config or log comparison — Compare two versions of a config file or log output
  • Content revisions — Check what changed between draft and final copy before publishing
  • Translation QA — Confirm only the intended lines changed between text versions

Whether you're a writer, editor, or developer, this tool makes changes between two texts easy to spot.

Tips and limitations

To get the most out of this diff checker, keep these points in mind:

  • Line-based comparison — Differences are detected per line, not per word or character
  • Whitespace matters — A line that only differs by trailing spaces will still show as changed
  • Browser compatibility — Works in all modern browsers (Chrome, Firefox, Safari, Edge)
  • Privacy — All comparison happens locally; no text is sent to servers
  • Large documents — Very long texts may take a moment to process in your browser

For word-level or character-level diffs of source code, a dedicated code diff tool may give more precise results.

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FAQ

How does the text diff checker compare text?

It compares the two texts line by line and highlights lines that were added, removed, or left unchanged, using a standard line-diff algorithm.

Does it detect changes within a line, like a diff for code?

This tool compares whole lines rather than individual words or characters. If a single word changes, the entire line is marked as changed so you can spot it quickly.

Is my text uploaded anywhere?

No. The comparison runs entirely in your browser with JavaScript. Neither text is sent to a server.

Can I compare large documents?

Yes, though very large texts (thousands of lines) may take a moment to process since everything runs in your browser rather than on a server.