Compare PDFs Online
Upload two PDF documents and see exactly what changed between them. Compare contracts, proposals, reports, and any document revision with a visual side-by-side viewer that highlights every difference.
When you receive a revised contract, updated report, or edited proposal, you need to know exactly what changed. PDF Compare uploads two PDF documents, renders each page, and compares them pixel by pixel — highlighting every difference in red so you can review revisions confidently.
- ✓ Pixel-by-pixel visual comparison
- ✓ Side-by-side, overlay, and diff views
- ✓ Downloadable comparison report
- ✓ Works on any device — browser-based
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Contract & Legal Revisions
Compare original and revised contracts to catch changes in terms, pricing, dates, and legal language before signing.
Report & Data Updates
Compare financial reports, project updates, or compliance documents to see which data points, charts, or sections changed between drafts.
Design & Layout Review
Compare PDF proofs, brochures, or marketing materials to check for layout shifts, font changes, image swaps, and visual differences.
How It Works
Upload two PDFs
Original and modified version
Choose view mode
Side-by-side, overlay, or diff
Review and download
See differences and get a report
Frequently Asked Questions
How does PDF Compare work?
Upload two PDFs — an original and a modified version. The tool renders each page and compares them pixel by pixel. Differences are highlighted in red so you can see exactly what changed between the two documents.
What view modes are available?
Three view modes: Side by Side shows both documents next to each other, Overlay blends them together with transparency, and Differences highlights changed areas in red against a dimmed background.
Can I compare PDFs with different page counts?
Yes. If one PDF has more pages than the other, the tool compares pages that exist in both documents and marks extra pages as 100% different.
Does PDF Compare detect text changes?
PDF Compare performs a visual pixel-by-pixel comparison. It detects any visible change on the page including text edits, moved elements, added or removed content, image changes, and formatting differences.
Is PDF Compare free?
PDF Compare is available as a Business plan feature for $13.99/month. It includes the comparison tool along with other Business tools like Workflow Automation, PDF Redaction, eSign, and Table Extraction.
Can I download a comparison report?
Yes. Click the Report button to download a text summary showing the difference percentage for each page, categorized as Identical, Minor changes, Moderate changes, or Major changes.