Choose two versions
Choose the old PDF, then the new version to review.
Processed locally · No upload
Visual PDF Version Comparison
Choose old and new PDFs to review each original page and a colour-coded overlay: red is removed, blue is added, and purple is a colour or content change. Different page counts are supported, and the full report can be exported.
1. Old PDF
2. New PDF
Red: removedBlue: addedPurple: colour/content change
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Tune tolerance
Lower it for tiny edits or raise it to ignore scan noise.
Review and export
Review every page and build a shareable difference PDF.
How should I read the result?
The tool compares final rendered pixels, so it can detect changes to text, images, layout, and colour, as well as pages present in only one file. It cannot decide whether an edit is legally or commercially meaningful, and scan movement, font rendering, or compression noise can create differences. Use the threshold to reduce noise and confirm important changes against the two originals.
Frequently asked questions
Are the PDF files uploaded?
No. Both PDFs are parsed, rendered, compared, and turned into a report entirely in your browser.
Why do similar scans show many differences?
Scan movement, compression noise, and font antialiasing alter pixels. Raise the threshold gradually and confirm important changes against both originals.
Can it decide whether a change is important?
No. It marks visual changes in the final pages but does not understand legal or business meaning. Important conclusions still require human review.