Upload Two PDFs to Compare
Original PDF
Drop PDF or click to upload
Comparing PDF
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Why Compare PDFs with PanaPDF?
Side-by-Side Comparison
Compare two PDF files page by page in a clear side-by-side layout. Instantly see content differences between the original and modified documents
Overlay Comparison Mode
Stack two PDFs on top of each other with adjustable opacity. Slide the transparency to reveal exactly where changes were made between versions
Pixel-Level Difference Detection
Automatically detect every visual difference between two PDF documents. Changed pixels are highlighted in red so you never miss a single edit
100% Browser-Based Privacy
Your PDF files never leave your device. All comparison processing happens locally in your browser — no uploads, no data stored, complete privacy guaranteed
How to Compare Two PDFs Online
Find every difference between two PDF documents in 4 simple steps — completely free
Upload Both PDFs
Upload the original PDF and the modified version. Drag and drop or click to browse — supports files up to 100 MB each
Choose Comparison Mode
Select Side by Side for a clear dual-pane view, Overlay to stack documents, or Difference to auto-detect pixel-level changes
Navigate & Inspect
Browse through pages using navigation controls. Zoom in on specific areas and use overlay opacity to pinpoint exact differences
Review All Changes
The diff mode shows a percentage of changed pixels per page, helping you quantify exactly how much has been modified between versions
Perfect for Every Workflow
Compare PDF documents to verify edits, track changes, and ensure document accuracy across revisions
Legal & Contract Review
Compare PDF contracts, agreements, and legal documents to verify that only agreed-upon changes were made between drafts. Catch unauthorized modifications instantly
Design & Publishing
Compare PDF proofs, layouts, and design files to spot visual differences. Verify that revisions match the requested changes before final production
Quality Assurance
Compare PDF reports, manuals, and documentation to ensure updates were applied correctly. Identify unintended changes across document versions
Trusted by:
- Lawyers reviewing contract revisions
- Editors checking document updates
- Designers verifying layout changes
- QA teams auditing document versions
The Easiest Way to Compare PDF Files Online Free
Need to find differences between two PDFs? PanaPDF lets you compare PDF documents visually — side by side, overlaid, or with automatic pixel-level difference detection — directly in your browser. Upload two PDFs, navigate page by page, and see every change highlighted instantly. Completely free, no account required, and your files never leave your device.
Compare PDFs online — works entirely in your browser
Three comparison modes: side-by-side, overlay, and diff
100% private — files never uploaded to any server
Supports all PDF documents up to 100 MB
Compare PDFs Free On Any Device
Find differences between PDF documents using any modern web browser — desktop, tablet, or phone
Mobile Friendly
Compare PDF files on iPhone, Android, or iPad. The responsive interface adapts to your screen for easy mobile document comparison
Desktop Optimized
Full-featured PDF comparison tool for Windows, Mac, and Linux. Side-by-side mode works best on wider screens for maximum detail
Cross-Platform
Works on Chrome, Firefox, Safari, and Edge. Compare PDF documents from any operating system, anywhere
Frequently Asked Questions
Everything you need to know about comparing PDF documents online