Code Difference Checker
Compare two code snippets side-by-side and visualize differences with syntax highlighting. Perfect for code reviews, debugging, and understanding changes between versions. See additions, deletions, and modifications at a glance.
Recommended Settings
Best Practices
- •Use split view for detailed side-by-side comparison
- •Use unified view for compact, Git-style diff output
- •Compare code at logical breakpoints (functions, classes)
Workflow Tips
- •Copy code from your editor for quick comparison
- •Swap sides to reverse the diff direction
- •Download diff results for documentation
Pro Tips
- •Green highlighting shows additions to the code
- •Red highlighting shows deletions from the code
- •All comparison happens client-side for privacy
Most Popular
Most users prefer split view for detailed code review
When to Use This Tool
Compare original code with modified versions during code reviews. Quickly identify what changed, review additions and deletions line-by-line, and provide targeted feedback on specific modifications.
Recommended: Development workflow
Identify differences between working and broken code versions. Track down regressions by comparing commits, understand what changes introduced bugs, and pinpoint exact lines that need fixing.
Recommended: Debugging
Visualize conflicting changes when merging branches. Understand what both sides changed, make informed decisions about which changes to keep, and ensure no important code is lost during merges.
Recommended: Git operations
How It Works
Paste your original code in the left panel
Paste your modified code in the right panel
Click 'Compare Code' to generate the diff
Review highlighted additions and deletions
100% Private
Files never leave your device. All processing happens locally in your browser.
Lightning Fast
Powered by Client-side JavaScript with react-diff-viewer-continued for optimal performance on modern browsers.
Open Source
Built with verified, open-source libraries. Fully transparent.
Frequently Asked Questions
What is a code diff?
A code diff (difference) shows the changes between two versions of code. It highlights additions (in green), deletions (in red), and modifications line-by-line, making it easy to see exactly what changed between versions.
What's the difference between split and unified view?
Split view shows both code versions side-by-side for easy comparison. Unified view combines both versions into a single column with + and - markers, similar to Git diffs. Split view is better for detailed comparison, while unified view is more compact.
Does this support syntax highlighting?
Yes! The diff viewer automatically detects common programming languages and applies appropriate syntax highlighting, making it easier to read and understand code changes across different file types.
Is my code safe and private?
Absolutely! All code comparison happens entirely in your browser using client-side JavaScript. Your code is never sent to any server, ensuring complete privacy and security for your sensitive code.
Can I compare code in different languages?
Yes, you can paste any code or text into either side. While mixing languages isn't typical, the tool will handle it. Syntax highlighting works best when both sides use the same language.