Diff Checker
Free Online Diff Checker & Text Compare ToolCompare text differences instantly in your browser.
100% client-sidePrivacy-first
Format:
Original Text
Enter the original version of your text for comparison.
Drag & drop (.txt, .json, .xml, .js, .css, .html, .md)
Modified Text
Enter the modified version of your text for comparison.
Drag & drop (.txt, .json, .xml, .js, .css, .html, .md)
Diff Results
Deletions in red, additions in green, modifications in yellow.
Lines added: 0Lines removed: 0Lines modified: 0Characters changed: 0
Side-by-side
Inline/Unified
Run a comparison to see highlighted differences.
All processing happens locally in your browser.
How to Use & Features
How to Use the Diff Checker
- Paste or type your original text in the left panel
- Paste or type your modified text in the right panel
- Click "Compare Texts" to see highlighted differences
- Use options to customize comparison (ignore whitespace, etc.)
- Copy or download the results
Features
- Side-by-side comparison - View differences in parallel columns
- Character-level diff - See exact character changes, not just lines
- Multiple view modes - Switch between side-by-side and inline
- File upload support - Compare .txt, .json, .js, and more
- Privacy-first - All processing happens in your browser
Common Use Cases
- Compare code versions before and after changes
- Review document edits and track modifications
- Check configuration file differences
- Validate JSON or XML changes
- Spot differences in log files
After comparing your text, you might need to format JSON data or encode text to Base64.
Frequently Asked Questions
- Is my text uploaded to a server?
- No. All text comparison happens locally in your browser. Your data never leaves your device.
- What file types can I compare?
- You can compare .txt, .json, .xml, .js, .css, .html, .md files, and any plain text format.
- What's the file size limit?
- Each file can be up to 5MB. The tool handles large files efficiently in your browser.
- Can I compare code files?
- Yes! This tool is perfect for comparing code changes, configuration files, and any text-based code.