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Text Diff Checker

Compare two texts line by line in your browser and clearly label unchanged, added, removed and adjacent replacement lines. Unicode, emoji, line breaks and special characters are never uploaded.

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Compare two texts

Enter text on either side to see a line-level comparison here.

What does a text diff checker do?

A text diff checker helps review copy revisions, product specifications, tag lists and configuration files. It compares both versions by line, presents adjacent removals and additions as an explicit replacement, and leaves other changes as additions or removals so version changes are quick to review.

Comparison logic

The tool normalizes CRLF, CR and LF line endings, then uses a longest-common-subsequence comparison to find retained lines. It calls a change only when adjacent removals and additions can be paired one-to-one, showing both the deleted and inserted text. Moves separated by unchanged content are not mislabeled as replacements.

Revision example

When “Free shipping over 999” changes to “Free shipping over 799”, the result shows a changed segment with the old line removed and the new line inserted. A separate new line such as “Taiwan mainland only” remains an addition.

How to use

  1. Paste the original version on the left and the revised version on the right.
  2. Choose Compare text to see which lines are unchanged, added, removed or changed.
  3. Review and copy the plain-text summary, or reset to compare another pair of versions.

Frequently asked questions

Does it compare characters or lines?

It currently compares lines. That is practical for versioned copy, lists and configuration text; a small edit inside one line appears as a clear replacement segment.

Is a moved line called a change?

Not automatically. Only adjacent removal and addition runs are paired as changes. A move separated by unchanged lines stays represented as its own removal and addition.

Can I compare Chinese, emoji and special characters?

Yes. The tool retains each original Unicode line, including Chinese, emoji, blank lines and common special characters.