Original PDF
Drop first PDF here or click to browse
Modified PDF
Drop second PDF here or click to browse
Comparison Results
Side-by-Side View
Compare documents in parallel with synchronized scrolling. See both versions simultaneously for easy review.
Text Highlighting
Added, deleted, and modified text is highlighted in different colors for quick identification of changes.
100% Private
All comparison happens in your browser. Your documents never leave your device - complete confidentiality guaranteed.
No Registration
Start comparing immediately without creating an account. Completely free with no hidden limitations.
How to Compare PDF Files
Upload the Original PDF
Click or drag the first PDF file (the original or older version) into the left upload area.
Upload the Modified PDF
Upload the second PDF file (the modified or newer version) into the right upload area.
Choose Comparison Mode
Select Visual Comparison for layout differences, Text Comparison for content changes, or Overlay Mode to see changes superimposed.
Click Compare
Click the "Compare PDFs" button to start the analysis. Results appear in seconds.
Review Differences
Navigate through highlighted differences. Added content appears in green, deleted in red, and modified in yellow.
When to Use PDF Comparison
Contract Review
Compare contract versions to ensure no unauthorized changes were made. Essential for legal document verification before signing.
Document Revisions
Track changes between document drafts. Perfect for editors, writers, and teams collaborating on reports or proposals.
Quality Assurance
Verify that PDF exports match source documents. Ensure no content was lost or altered during conversion.
Regulatory Compliance
Compare policy documents to identify updates. Track regulatory changes and ensure compliance documentation is current.
Academic Work
Compare thesis drafts, research papers, or assignment versions. Track feedback implementation and revision progress.
Invoice Verification
Compare invoice versions to detect discrepancies. Ensure quoted prices match final invoices before payment.
Frequently Asked Questions
How does PDF comparison work?
Our PDF comparison tool analyzes both documents page by page, extracting text and visual elements. It then identifies differences in text content, formatting, images, and layout, highlighting changes for easy review.
Can I compare scanned PDF documents?
Yes, you can compare scanned PDFs using visual comparison mode. For text-based comparison of scanned documents, we recommend using our OCR tool first to make the text searchable.
Is there a file size limit for comparison?
Since all processing happens in your browser, there's no server-imposed limit. The practical limit depends on your device's memory. Most devices can handle PDFs up to 100MB each.
Are my documents secure during comparison?
Absolutely! Your files never leave your device. All comparison processing happens locally in your browser, ensuring complete privacy and security for sensitive documents.
Can I compare PDFs with different page counts?
Yes, you can compare PDFs with different numbers of pages. The tool will compare matching pages and clearly indicate any added or removed pages between the two versions.
What types of differences can be detected?
The tool detects text additions, deletions, and modifications. Visual mode also identifies layout changes, image differences, and formatting variations between documents.