Compare Code
Paste your original code on the left and the modified code on the right to see the differences.
How to Use
- Paste or type your original code in the "Original Code" field
- Paste or type the modified version in the "Modified Code" field
- Select the programming language for proper syntax highlighting
- View the diff output with additions highlighted in green and deletions in red
- Switch between side-by-side and unified view modes
- Copy the diff output or download it for sharing
Features
Syntax-Aware Comparison
Compare code with proper syntax highlighting for multiple programming languages including JavaScript, Python, Java, and more.
Multiple View Modes
Choose between side-by-side comparison or unified diff view, similar to Git diff output formats.
Line-by-Line Analysis
See exactly which lines were added, removed, or modified with clear line numbers and change indicators.
Ignore Options
Optionally ignore whitespace changes, case differences, or blank lines to focus on meaningful code changes.
Common Use Cases
- Code Review: Compare pull request changes or different code versions
- Debugging: Find differences between working and broken code versions
- Refactoring: Verify changes made during code refactoring
- Merge Conflicts: Understand differences when resolving merge conflicts
- Learning: Compare your solution with reference implementations
- Documentation: Generate diff output for code change documentation
Frequently Asked Questions
What is Code Diff Tool?
Compare two code blocks and highlight the differences line-by-line or word-by-word. It shows additions in green and deletions in red, similar to Git diff output, making it easy to identify exactly what changed between two versions of code.
What programming languages are supported?
The Code Diff Tool supports syntax highlighting for many popular languages including JavaScript, TypeScript, Python, Java, C++, Go, Rust, HTML, CSS, SQL, and many more. The diff comparison works with any text-based code.
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 visually. Unified view combines both versions into a single view with +/- indicators, similar to Git unified diff format.
Is my code secure?
Yes! All code comparison happens directly in your browser. Your code is never sent to any server or stored anywhere. Everything is processed locally on your device.