Compare PDF

Compare PDF finds the differences between two versions of a PDF document, both in the text and on the rendered page. Load the original as A and the revised version as B. Pages are matched either by content, so inserted or deleted pages are recognized and the following pages still line up, or simply page by page. A list then marks each page pair as the same, changed, added or removed.

Each page can be inspected side by side with the changes marked, as a colored overlay where content found only in A is red and content found only in B is green, with a slider that reveals one version over the other, or as a text diff. Pixel tolerance, ignore whitespace and ignore case reduce noise from rendering or formatting differences. You can jump from change to change, download the overlay as a PNG and save a text report of all differences.

Typical uses are checking what changed in a revised contract, reviewing edits to a manuscript, a specification or a drawing, confirming that a re-exported document still matches the approved version, or producing a quick redline of two PDFs. Both files are compared in your browser and are not uploaded.