Compare two PDFs
Two versions of the same document, side by side, page by page: what changed shows. Both files stay on your device.
Free · 100% local — nothing is uploaded- 1Open the first version.
- 2Point to the second: the comparison runs page by page.
- 3Walk through the differences found.
How to compare two PDFs and see the differences
Open the first version, point to the second, and the comparison runs page by page: what has been added, removed or moved is picked out in color, and you step from one difference to the next without rereading the whole document. The comparison works on matched text, not on a stack of images: a paragraph moved lower down is recognized as moved, not as deleted and then rewritten — that is what separates a real comparison from a mere overlay. You also get a summary of the changes, to add to the file. Both documents stay on your device: reading a contract against its counter-proposal, a quote against its revised version, a dissertation against its correction does not force you to entrust both to a server. The summary exports as a PDF, to be added to the file or passed to the next reviewer.
Two versions that do not have the same number of pages
That is the usual case when a paragraph has been added: the pagination shifts, and the whole rest of the document would look changed. Matching works on content, so an inserted page is flagged as inserted and the pages that follow are not counted as changed. A scanned version and its digital one can be compared too, provided the scan goes through character recognition first.
Frequently asked questions
Does the comparison work on the text or on the image?
On what the page shows: visual differences are reported, a layout that has shifted included — and not only a word that changed.
Do both files need the same number of pages?
No. Pages are compared in order, and a difference in length is flagged rather than ignored.
Are my two documents sent anywhere?
No. The comparison happens entirely inside your browser.
Can I compare a contract with its signed version?
Yes, that is the commonest case: the comparison reports, page by page, what changed on screen between the two versions — a word, a clause, a layout that moved.
Can I compare a scan with its digital version?
The comparison works on what the page shows, so yes — but a scan brings its own grain and slight offset, and most of the differences found will be those of the paper, not of the text.