Diff Checker
Runs in browserCompare Text and JSON documents
How to Use
Paste text in original and modified fields to compare.
- Green for additions
- Red for removals
- Character-level highlights
Comparison Result
Comparison results will appear here
About Text Diff Checker
Text diff compares two text blocks and highlights the differences. Using the Myers diff algorithm, this tool identifies additions, deletions, and changes line by line — essential for code review, document comparison, and content management.
How It Works
- Myers Algorithm: Finds the shortest edit script between texts
- Line-by-line: Compares text as sequences of lines
- Color coding: Green for additions, red for deletions
- Inline changes: Character-level highlighting within changed lines
Common Use Cases
- Code review: Compare code versions
- Document editing: Track changes between revisions
- Configuration: Compare config files
- Data validation: Verify expected vs actual output
💡 Pro Tips
- Use JSON mode for semantic comparison that ignores formatting
- Git uses similar diff algorithms for version control
- This tool runs locally — your data stays in your browser
Further Reading
- An O(ND) Difference Algorithm (Myers) - The underlying algorithm paper.
- Git Diff Documentation - How diff is used in version control.