Compare documents with confidence
Find differences between two documents quickly and securely. All processing happens in your browser.
Example comparison
Preview only. Start comparing to add files.
Original document
Revised document
Privacy-first design
Your documents never leave your device
Private by default
All comparisons are done locally in your browser. No data is uploaded to servers.
Accurate results
Advanced diff algorithm detects even subtle changes in text, formatting, and structure.
Lightning fast
Process large documents instantly without waiting for server responses.
Zero-upload architecture
Document tools often send sensitive files to a remote server. DocDiff runs extraction and comparison in your browser memory, so review data stays on your device.
Intelligent diff algorithm
The engine aligns paragraphs, ignores optional whitespace and case, and keeps context visible across contracts, product copy, and spreadsheet text.
Simple workflow
1. Upload or paste
Select two documents or paste text content to compare.
2. Customize options
Choose comparison settings like case sensitivity and whitespace handling.
3. Review changes
See a detailed view of all additions, removals, and modifications.
Frequently asked questions
Is my data secure?+
Yes. All document processing happens locally in your browser. Your files never leave your device.
What file formats are supported?+
We support DOCX, XLSX, XLS, TXT, and Markdown files. You can also paste plain text directly.
Can I compare large documents?+
Yes. The tool is designed to handle large documents efficiently. Processing happens locally for optimal performance.
Is there a file size limit?+
There's no hard limit, but very large files (over 100MB) may take longer to process and could affect browser performance.