Code Diff Tool - Compare Code Online with Syntax Highlighting

About Code Diff Tool

Our free online Code Diff Tool allows you to compare two code snippets with syntax highlighting for over 20 programming languages. Whether you're reviewing code changes, debugging, or comparing different versions of your code, this tool provides a clear visual representation with GitHub-style diff highlighting. All processing happens in your browser - your code never leaves your device.

How to Use

Select the programming language from the dropdown menu.
Paste or type the original code in the left editor panel.
Paste or type the modified code in the right editor panel.
Click 'Compare' to see the differences highlighted below.
Toggle between 'Side by Side' and 'Unified' view modes.
Use 'Export HTML' to save the diff result as an HTML file.

Frequently Asked Questions

What programming languages are supported?

This tool supports 20+ programming languages including JavaScript, TypeScript, Python, Java, Go, Rust, C++, C#, PHP, Ruby, Swift, Kotlin, SQL, HTML, CSS, JSON, YAML, XML, Markdown, and Shell/Bash.

What's the difference between Side by Side and Unified view?

Side by Side view shows the original and modified code in two columns, making it easy to compare line by line. Unified view shows all changes in a single column with additions and deletions marked inline, similar to git diff output.

Is my code secure when using this tool?

Absolutely! All code comparison is performed entirely in your browser using JavaScript. Your code is never sent to any server, ensuring complete privacy and security.

Can I export the diff result?

Yes! You can export the diff result as an HTML file that includes the syntax highlighting and diff styling. This is useful for sharing or documentation purposes.

Code Diff