Compare PDF
See the visual differences between two PDF files.
Original PDF
or drag and drop
Modified PDF
or drag and drop
Output is a 3-column PDF: Original · Modified · Diff (changes in red). Visual pixel diff only — not a text-level diff.
Files stay on your device
Upload two versions of a PDF and get a side-by-side comparison with a visual diff overlay. Changed areas are highlighted in red, unchanged areas are faded. Each page pair becomes one page in the output PDF — original on the left, modified in the middle, diff on the right. Useful for spotting edits in contracts, reports, or design files. Runs in your browser using pdfjs-dist.
How it works
How Compare PDF works
Upload both PDFs
Drop the original and the modified version of your PDF.
Click Compare
Each page is rendered and compared pixel by pixel. Changed areas are highlighted in red.
Download the comparison PDF
Each page shows original, modified, and diff side by side — saved to your device.
FAQ
Frequently asked questions
- No. Both PDFs are rendered and compared in your browser. Nothing is sent to a server.