Compare PDFs
Put two versions of the same PDF side by side and see exactly what changed. Compare the extracted text line by line, or overlay both pages pixel by pixel to catch layout, image and font edits. Both documents stay on your device.
How it works
- 1
Load A and B
A is the original, B is the revised version — drop or pick each file.
- 2
Choose how to compare
Text finds wording changes; visual finds anything that looks different.
- 3
Review page by page
Jump between pages, read the counts, and export the text diff as a report.
Your privacy is the point
This tool runs entirely in your browser using WebAssembly and Canvas. Your file is never uploaded to a server, never stored and never seen by anyone but you.
Frequently asked questions
Can I compare scanned PDFs?+
Visual comparison works on any PDF because it compares rendered pixels. Text comparison needs an embedded text layer — for a scan, run OCR first or stay in visual mode.
Why does a page look identical but still show differences?+
The files may have been re-saved with different image compression or a different producer, which changes individual pixels. Pages are compared at up to 900 px wide, so very faint anti-aliasing differences can register.
Are the PDFs uploaded to compare them?+
No. Both files are read by your browser, rendered on canvases and compared in memory. Nothing is sent anywhere, and closing the tab clears it.
Related tools
All toolsEverything runs locally. No uploads, no server-side copies.