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Free Online Text Diff Checker & Comparison Tool

Paste two versions of any text to instantly see the differences between them. Additions are highlighted in green, deletions in red, and modifications are clearly marked. Compare code versions, document revisions, configuration files, or any two text blocks. The comparison runs entirely in your browser — nothing is uploaded to any server.

Original text

Modified text

+2added

−2removed

2unchanged

Original (removals)

1 The quick brown fox

2−jumps over the lazy dog.

3 This line is unchanged.

4−This line will be removed.

Modified (additions)

1 The quick brown fox

2+jumps over the lazy cat.

3 This line is unchanged.

4+This is a new line.

Common questions

How does the diff algorithm work?

The tool uses a line-by-line comparison algorithm. Each line in both texts is compared, and differences are highlighted: green for added lines, red for removed lines. Lines present in both versions are shown unchanged.

Can I compare code files?

Yes. The diff checker works with any text including source code, configuration files, JSON, XML, and plain text. It preserves whitespace and indentation for accurate code comparison.