Free Online Diff Checker
Compare two texts and see the differences line by line. Find added, removed, and...Compare two texts and see the differences line by line. Find added, removed, and unchanged lines instantly with color-coded results.
Comparison Features
Why Use Free Online Diff Checker?
Line-by-Line Comparison
See exactly which lines were added, removed, or remain unchanged with accurate line numbers for both versions.
Flexible Options
Ignore whitespace or case differences based on your needs. Perfect for comparing code with different formatting.
Color Coded Results
Green for additions, red for deletions, with clear visual indicators. Understand changes at a glance.
100% Private
All processing happens in your browser. Your text data never leaves your device or gets stored anywhere.
Common Uses for Diff Checker
Code Review
Compare code versions to review changes before merging or deploying.
Document Revision
Track changes between document drafts and identify what was modified.
Merge Conflicts
Understand and resolve merge conflicts by comparing conflicting versions.
Config Comparison
Compare configuration files between environments to spot differences.
How It Works
Paste Your Texts
Enter the original text in the left box and the modified version in the right box. You can compare code, documents, or any text content.
Configure Options
Use "Ignore whitespace" to skip indentation differences or "Ignore case" for case-insensitive comparison.
Review Differences
See the color-coded diff result below. Green lines are additions, red lines are deletions, and white lines are unchanged.
Tips for Better Comparisons
Use Load Sample
Click 'Load Sample' to see how the diff checker works with a real code example before using your own text.
Ignore Whitespace for Code
When comparing code from different editors or formatters, enable 'Ignore whitespace' to focus on actual content changes.
Large Files
For very large files (10,000+ lines), the comparison may take a moment. Consider breaking large comparisons into smaller sections.