See Exactly What Changed Between Two PDF Versions
Quickly spot revisions in legal contracts, architectural drafts, financial estimates, and modified corporate agreements.
Quick Definition & Overview
PDF Diff renders each page pair side-by-side, analyzing layout shifts, font modifications, and paragraph replacements.
- Side-by-side page alignment with header notes
- Identifies added, deleted, and altered pages
- Outputs an easy-to-read comparative PDF report
Input
2 PDF Files
Output
Diff Report PDF
Privacy
Auto-Cleaned
Cost
100% Free
How to use Compare PDFs
- Upload Both FilesSelect Document A (Original) and Document B (Revision).
- Verify OrderConfirm which file is the source and which is the revision.
- Generate DiffClick 'Process Compare PDFs' to create the side-by-side report.
- Download ReportReview and save your comparative diff document.
Frequently Asked Questions
How does PDF comparison work?
SmartAssPDF renders each page pair at high resolution and computes visual and textual delta masks to highlight additions, deletions, and layout modifications side-by-side.
Can I compare PDFs with different page counts?
Yes. The comparison tool aligns common pages and flags appended or excised pages in the final comparison diff report.
How are differences highlighted in the comparison report?
Added content is highlighted in green, deleted content in red. The report renders matching pages side-by-side with pixel-level delta analysis to show both visual and textual differences.