Diff Checker
Compare files online with a visual difference checker. Upload files, paste text, and see every change highlighted side-by-side in seconds.
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Start Comparing Files
Upload files or paste text to see differences highlighted side-by-side
Diff Checker
Paste text or load two files to compare changes side-by-side.
How to Use Diff Checker
- 1
Add Your Text
Paste or type text into both the 'Original' and 'Modified' text areas. You can also load text files using the 'Load File' buttons.
Tip:The tool works great with code, documents, configuration files, or any text content you want to compare. - 2
View Differences
The tool automatically highlights differences between the two texts. Red indicates removed content, green shows added content, and yellow highlights modified lines.
Tip:Line numbers help you quickly locate specific changes in your files. - 3
Navigate Changes
Scroll through both panels simultaneously to review all changes. The side-by-side layout makes it easy to understand what was modified.
Tip:Use the scroll bars or mouse wheel to navigate through longer files while keeping both versions aligned. - 4
Load Files
Click 'Load File' buttons to upload text files directly from your computer. Supports various text formats and encoding.
Tip:Files larger than 10MB are rejected to ensure good performance. The tool also detects and rejects binary files.
Features & Benefits
Side-by-Side Comparison
View both versions simultaneously with synchronized scrolling for easy navigation through changes.
Visual Diff Highlighting
Clear color coding shows additions (green), deletions (red), and modifications (yellow) at a glance.
File Upload Support
Drag and drop or browse to upload text files directly from your computer for comparison.
Line Number Navigation
Quickly locate specific changes with line numbers and synchronized scrolling between panels.
Privacy-First Processing
100% client-side processing ensures your files never leave your browser - complete data privacy.
Large File Support
Handle files up to 10MB with efficient diff algorithms designed for performance and accuracy.
Frequently Asked Questions
What file types can I compare?
You can compare any text-based files including code files (.js, .py, .html, .css), documents (.txt, .md), configuration files (.json, .xml, .yml), and more. Binary files are automatically rejected.
Is there a file size limit?
Yes, files larger than 10MB are rejected to ensure good performance and user experience. This limit accommodates most text files and code documents.
Are my files uploaded to a server?
No, all text comparison happens entirely in your browser. Your files and text content never leave your device and are not stored anywhere.
How accurate is the diff algorithm?
We use a professional-grade line-based diff algorithm that's similar to what's used in version control systems like Git. It accurately identifies additions, deletions, and modifications.
Can I compare code with syntax highlighting?
The current version focuses on text comparison with clear visual indicators for changes. Syntax highlighting may be added in future updates based on user feedback.
Does it work with different text encodings?
Yes, the tool automatically detects and handles various text encodings including UTF-8, ASCII, and most common character sets used in text files.
Use Cases & Applications
Code Reviews
Compare different versions of source code to review changes, bug fixes, or feature additions.
Document Revisions
Track changes in documents, contracts, or written content between different versions.
Configuration Files
Compare configuration files to identify changes in settings, parameters, or system configurations.
Content Updates
Review changes in website content, blog posts, or marketing materials before publishing.
Database Schema Changes
Compare database schemas, SQL scripts, or migration files to track structural changes and ensure consistency.
Legal Document Review
Review contract changes, policy updates, or legal document revisions with precise line-by-line comparison.