Compare PDFs
Compare two PDF documents side by side to detect visual differences and layout shifts. Highlight modified page regions with an intuitive magenta pixel overlay.
Your files never leave your device. All processing happens locally in your browser with no file uploads or account required.
How to use compare pdfs
- 01
Select two PDFs
Choose original document A and revised document B to compare.
- 02
Examine differences
Navigate matching pages using side-by-side view or magenta visual difference highlighting.
- 03
Inspect changed pages
Jump directly between detected differences to verify additions, deletions, or subtle moves.
Important details & limitations
Choose exactly two PDFs, ordered A then B. Compare matching page numbers side by side or with a magenta pixel-difference overlay. Different page dimensions and missing pages are flagged; pages are not automatically realigned.
Frequently asked questions
What should I know before using compare pdfs?+
Choose exactly two PDFs, ordered A then B. Compare matching page numbers side by side or with a magenta pixel-difference overlay. Different page dimensions and missing pages are flagged; pages are not automatically realigned.
Where are my files processed?+
All document contents remain on your device. Browser JavaScript and WebAssembly perform the work; no files are sent to a conversion service.
What files does compare pdfs support?+
Use unencrypted PDFs; Unlock PDF can first remove encryption using a known password. Up to 100 MB total. Malformed, unusually large, or complex PDFs may exceed browser limits. Editing a signed PDF changes the document and can invalidate its signature.