Compare Two PDF Files
Review two PDFs side by side with synchronized scrolling and visual page differences.
Upload
Drop the left PDF
Upload the older or baseline version.
Upload
Drop the right PDF
Upload the revised or review version.
How it works
- Upload the left and right PDFs.
- Render both documents side by side.
- Inspect the highlighted differences.
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FAQ
How are the differences calculated?
Each page is rendered in the browser with PDF.js, normalized to the same canvas size, and compared pixel by pixel. Changed pixels are highlighted in red on the diff pane.
Is this tool private?
Yes. For this workflow, file processing happens securely and the document is not uploaded to ScrollPDF during the tool operation.
What file size limit applies?
ScrollPDF currently validates files up to 100 MB per file in the browser UI.
Why can the output look different from the source file?
PDF structure, fonts, compression, form fields, and embedded assets vary between files, so exported results can differ slightly depending on the operation and the original document.
Do I need to create an account to use this tool?
No. Core ScrollPDF tools remain available without an account. Accounts are for profile, auth, and future saved-file features.