What diff algorithm does this use?

The tool uses a standard line-by-line diff algorithm similar to Unix diff. It finds the longest common subsequence to minimize the number of reported changes, giving you the most meaningful comparison.

Can I compare code files?

Yes. The diff checker works with any text content — source code, JSON, XML, configuration files, prose, CSV data, etc. Whitespace and indentation differences are detected and highlighted.

Does it detect moved lines?

The diff algorithm detects additions and deletions. A line that moves from position A to position B appears as a deletion at A and an addition at B. It doesn't explicitly label moves, similar to how git diff works.

Is there a size limit?

The tool handles texts up to several thousand lines efficiently in your browser. For very large files (10,000+ lines), processing may slow down. Consider using command-line tools like diff or git diff for massive files.

Diff Checker | Any-Tools.net

About This Tool

Compare two blocks of text and highlight the differences line by line. The diff checker shows added, removed, and modified lines with color coding — green for additions, red for deletions. Useful for comparing code versions, configuration files, document drafts, or any two text blocks to spot changes.

How to Use

Paste the original text in the left panel.
Paste the modified text in the right panel.
Click Compare to highlight all differences between the two texts.
Review the color-coded diff: red = removed, green = added, yellow = modified.

Frequently Asked Questions

What diff algorithm does this use?: The tool uses a standard line-by-line diff algorithm similar to Unix diff. It finds the longest common subsequence to minimize the number of reported changes, giving you the most meaningful comparison.
Can I compare code files?: Yes. The diff checker works with any text content — source code, JSON, XML, configuration files, prose, CSV data, etc. Whitespace and indentation differences are detected and highlighted.
Does it detect moved lines?: The diff algorithm detects additions and deletions. A line that moves from position A to position B appears as a deletion at A and an addition at B. It doesn't explicitly label moves, similar to how git diff works.
Is there a size limit?: The tool handles texts up to several thousand lines efficiently in your browser. For very large files (10,000+ lines), processing may slow down. Consider using command-line tools like diff or git diff for massive files.

Diff Checker

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