Compare Two PDFs Online Free
Spot every difference between two PDF versions. Upload an original and a changed file to see them side by side with changed pixels highlighted — all in your browser, nothing uploaded.
Frequently Asked Questions
Are my PDFs uploaded to a server?
No. Both files are rendered and compared entirely in your browser with pdf.js. Nothing is uploaded.
How does the comparison work?
Each page of both PDFs is rendered to an image and compared pixel by pixel. Differences are highlighted in red in a third panel so changes are easy to spot.
Does it compare text or appearance?
It compares the visual appearance of each page, which catches text edits, moved elements, and formatting changes alike.
What if the PDFs have different page counts?
You can still step through every page. Pages that exist in only one document are flagged instead of diffed.
Is it free?
Yes — completely free, no account, no watermark, no limits.