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Compare Two PDFs Side by Side - Free Diff Viewer

Spot changes between two versions with synced side-by-side viewing and a pixel difference overlay.

Find Every Change Between Two Versions

A contract came back "unchanged"? Verify it. AiLoveKit's PDF comparison tool loads two versions and shows them in synced side-by-side view, or switches to a pixel-diff overlay where any changed pixel glows red. It's the fastest way to audit revisions of contracts, layouts, drawings, and reports - without sending either file anywhere.

Two Comparison Modes

Frequently Asked Questions

How does the difference overlay work?

Both pages are rendered at the same size and compared pixel by pixel; changed areas light up in red on the overlay.

Can the PDFs have different page counts?

Yes. Navigation covers both documents; pages missing on one side are shown as blank placeholders in diff mode.

Are my documents uploaded for comparison?

No - both files render locally in your browser, so confidential contracts can be diffed safely.