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Handy Browser Tools

Text Diff Checker

Compare two versions of text and see which lines were added or removed.

How to use
Private by default: processing stays on your device
YOUR TEXTS

Two versions to compare

Spot every change.

Compares line by line as you type; large inputs update on demand.

Differences

Good to know

Each side is limited to 3,000 lines. Copy matches exactly what is shown: added lines start with “+”, removed with “−”. Everything runs in your browser.

How to use this tool

  1. Paste your original text and your revised text into the two boxes.
  2. Review the added and removed lines; select Compare after larger edits.
  3. Select Copy differences to copy the comparison.

Example

Input

Left: cat
dog
bird - Right: cat
fish
bird

Output

  cat
- dog
+ fish
  bird
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Frequently asked questions

How does the comparison work?

The tool computes a longest-common-subsequence diff line by line (the same approach used by git), so unchanged lines stay aligned and only real changes are highlighted.

Is my text uploaded to compare?

No, the diff is computed entirely in your browser, so your text is not uploaded anywhere. Drafts are saved in this browser's localStorage as you type, so avoid sensitive text on shared devices.

Is there a size limit?

Automatic comparison runs up to 20,000 combined characters; for larger text, select Compare to update the differences. Each side is also capped at 3,000 lines. Beyond that, the tool shows an error instead of a truncated result.

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