Compare PDF visually
Compare two PDF documents side by side with synchronized navigation and highlighted pixel differences. Local processing without uploads.
Select exactly two PDF files to compare.
Drop your files here
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PDF · 25 MB per file · 10 files / 60 MB per batch · 300 pages total
Visual comparison at 72 DPI, matching pages by their position. Red highlights mark RGB differences above 24/255. Missing pages are shown by page count; insertions can shift comparisons. This does not establish semantic equivalence or detect every small change. Maximum comparison canvas: 4 megapixels.
How to use this tool
Select your files. They remain on your device.
Review the preview and choose the options below it.
Process locally, preview the result and download a new copy.
When to use it
Review visual changes between document versions. Pages are matched by position, without semantic analysis.
Limits and privacy
Visual comparison at 72 DPI, matching pages by their position. Red highlights mark RGB differences above 24/255. Missing pages are shown by page count; insertions can shift comparisons. This does not establish semantic equivalence or detect every small change. Maximum comparison canvas: 4 megapixels.
PDF parsing keeps the document in memory. Limits of 25 MB per PDF, 60 MB per batch and 300 pages help bound memory on mobile devices. Rendering is limited to 16 megapixels per page, and exports to 120 MB. Very complex files can still exceed device memory.
Questions and answers
Are my documents uploaded?
No. Processing and preview run in your browser. Reloading or starting again releases the session. Nothing is saved to a user account.
Why are there technical limits?
PDF parsing keeps the document in memory. Limits of 25 MB per PDF, 60 MB per batch and 300 pages help bound memory on mobile devices. Rendering is limited to 16 megapixels per page, and exports to 120 MB. Very complex files can still exceed device memory.
Is the original replaced?
No. FIXLY downloads a new file. Keep the source and check the exported pages, fonts, links and layout before relying on it.