Compare PDF

Compare PDF shows what changed between two versions of a document: a contract before and after the other side's edits, two drafts of a report, or a quote that was revised. You choose the original and the changed PDF, and the tool compares page 1 with page 1, page 2 with page 2, and so on.

For every page you get three views. Text shows the page's words with additions highlighted in green and deletions struck through in red, from a word-by-word comparison of the text in each PDF. Overlay draws both versions on top of each other: ink only in the original shows in red, ink only in the changed version in green, and everything the same in light gray, which catches moved images, changed logos, signatures and layout shifts that have no text. Side by side shows the two pages next to each other. A summary counts the pages with changes and the words added and removed, and you can download the whole comparison as a self-contained HTML report that opens in any browser and can be printed to PDF.

Limits: pages are matched by position, so a page inserted in the middle makes every later page show as changed. Scanned PDFs have no text layer, so only the visual overlay shows their changes. The visual overlay covers the first 150 pages.

Reading two versions of a contract line by line is slow, and small edits to a figure, a date or a clause are easy to miss. A side-by-side comparison points straight at them. Comparing in your browser matters for exactly these documents: unsigned contracts and draft reports should not be uploaded to a third party.