Text Comparison Tool
Compare two texts, highlight differences, and merge text with powerful comparison features.
Comparison Options
Original Text
Modified Text
Text Comparison Guide
Intelligent diff tool for comparing two text versions with highlighted changes. Perfect for code review, document version control, translation proofreading, and content revision tracking.
Pull Request Code Review
Scenario: Reviewer needs to quickly spot changes in a config file PR.
Solution: Paste old version (left) → Paste new version (right) → Check "Ignore whitespace" → Compare
Result: Found 3 changes in 5min (70% faster), caught 1 critical bug before merge.
Contract Document Review
Scenario: Legal team needs to verify all changes in revised contract.
Solution: Compare original vs revised → Review each highlighted change
Result: Found 7 modifications including 2 critical clause changes, protected company interests.
API Documentation Updates
Scenario: Backend updated API, frontend needs to identify breaking changes.
Solution: Compare v1.0 vs v2.0 docs → Identify removed fields (red) and new required params (green)
Result: Identified all breaking changes, prepared frontend adaptation, avoided runtime errors.
FAQ
What do red and green highlights mean?
Red: Deleted in new version. Green: Added in new version.
What algorithm powers the comparison?
Classic diff algorithm based on Longest Common Subsequence (LCS) - same algorithm used by Git and SVN.
Maximum text size?
Recommended: <5000 lines per side (<1s). Acceptable: 5K-10K lines (2-3s). Very large files: use specialized diff tools.
🔒 Technology & Privacy
Algorithm
- • LCS (Longest Common Subsequence)
- • Smart move/modify/delete detection
- • Dynamic programming optimization
- • Pure frontend JavaScript
Privacy
- • Local processing only
- • Safe for confidential documents
- • No traces after closing
- • Open source algorithm
Performance: Compare 1000 lines <200ms, 5000 lines <1s. Supports line/word/character-level diff.