Whether you are reviewing a revised contract, checking a reprinted document, or auditing PDF changes, a visual before/after comparison shows every difference instantly.
Navigate to the compare tool. Upload the before (original) PDF as File A and the after (revised) PDF as File B.
Click Compare. Use Side by Side to view both versions simultaneously. Use Overlay to switch between versions on the same canvas. Use Diff view to see only the changed pixels highlighted in red.
Tip: Diff view is the fastest way to find what changed — changed pixels appear in red against a greyscale background, making even subtle differences obvious.
Click Download All Pages as PDF to export a full comparison report showing all highlighted changes.
Yes. Pages are compared by position — if File B has more pages, the extra pages are shown as entirely new content.
Yes — completely free at pdfeditor.onl/compare-pdf with no login required.