Compare PDF
Compare two PDF files side-by-side and highlight differences
Original PDF
Drop first PDF here
or click to upload
Modified PDF
Drop second PDF here
or click to upload
How to Compare PDF Files Online
Comparing two PDF documents to find differences is essential for reviewing contracts, tracking document revisions, and verifying changes. Our free PDF comparison tool lets you upload two PDFs, view them side-by-side, overlay them, or highlight all differences automatically in red.
Comparison Process:
- Upload PDFs: Drag and drop both PDF files you want to compare
- Choose View Mode: Select side-by-side, overlay, or difference highlighting view
- Review Differences: Navigate through pages to see all changes between documents
- Analyze Changes: Identify text modifications, additions, and deletions visually
Why Compare PDF Documents?
✓ Three View Modes
Side-by-side, overlay, and difference highlighting views for comprehensive comparison.
✓ Visual Differences
Automatically highlight all changes in red for instant identification of modifications.
✓ Contract Review
Compare contract versions to verify all requested changes were made correctly.
✓ Version Control
Track document revisions and see exactly what changed between versions.
✓ Page-by-Page
Navigate through all pages to review differences throughout entire documents.
✓ 100% Free
Unlimited comparisons without registration, watermarks, or hidden costs.
Frequently Asked Questions
What does each view mode show?
Side-by-side shows both PDFs together, overlay superimposes them with transparency, and difference view highlights changes in red.
Can I compare different page counts?
Yes, you can compare PDFs with different numbers of pages. Navigation adjusts to the longest document.
Does it show text-level differences?
The tool performs visual comparison, highlighting any pixel differences including text, images, and formatting.
How accurate is the comparison?
Very accurate - even small changes in text, spacing, or images are detected and highlighted.
Can I compare scanned PDFs?
Yes, visual comparison works with any PDF type including scanned documents and images.
Is there a file size limit?
We support large PDFs, though very large files may take longer to process and compare.