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Compare PDF (Visual Diff)

Spot every change between two PDFs with a red diff overlay on each page. Great for contracts and drafts — 100% local.

How this works— tap to see the steps

1
Drop two PDFs
Load an original and a revised copy. The tool aligns them page by page.
2
See what changed
Added text is highlighted one colour, removed text another — no more squinting at revisions.
3
Export the diff
Save a marked-up PDF you can share with your team or client.

Watch: differences light up between two inputs

Original (A)

Drop original PDF

PDF

Tip: you can also paste an image with ⌘V / Ctrl V

Revised (B)

Drop revised PDF

PDF

Tip: you can also paste an image with ⌘V / Ctrl V

Sensitivity (24)

Lower catches subtle changes; higher ignores anti-aliasing noise.

Drop both PDFs and compare to see a red-highlighted diff for every page.

How this works — and why it's private

Both PDFs are rendered locally with pdfjs at matching resolution — nothing is uploaded.
Pixels are compared per page. Pixels that differ beyond your sensitivity are painted red on top of a dimmed background.
Toggle between Diff, Original and Revised, or download any page's diff as a PNG for review.

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