What diff algorithm is used?

The tool uses a Myers diff algorithm implementation in JavaScript to compute the longest common subsequence and generate accurate line-by-line diffs, the same approach used by Git.

What languages are supported for syntax highlighting?

The language selector provides visual categorization and label context. The diff logic itself is language-agnostic and works with any plain text, code, or configuration file.

What is unified diff / patch format?

Unified diff format (used by Git and the Unix patch command) shows changed lines with + and - prefixes along with context lines. It can be applied directly to source files using the 'patch' command-line tool.

Can I compare files from my computer?

Yes. Click the file upload buttons next to each panel to load a local text or code file directly from your computer into the diff viewer.

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Code Diff Viewer

Side-by-side code diff with syntax highlighting and patch export

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关于此工具

Compare two code snippets side by side with a clear, color-coded diff. Added lines are highlighted in green, removed lines in red, and changed lines in orange. Line numbers are shown for both sides. Select the programming language for syntax-aware display. Export the diff as a standard unified patch file that can be applied with the patch command.

使用方法

1 Paste the original (old) code into the left panel.
2 Paste the new code into the right panel.
3 Select the programming language from the dropdown for context.
4 The diff updates instantly — green lines are additions, red are removals, orange are changes.
5 Scroll both panels simultaneously to compare large files.
6 Click 'Copy Patch' to copy the unified diff to your clipboard.
7 Use 'Load File' buttons to compare files from your computer.

关于此工具

使用方法

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