QBMFX Compare two PDFs visually
Compare two versions of a PDF using rendered page pixels and inspect a page-level report. The workflow can reveal changed page artwork, moved text or added marks without sending the documents to an outside comparison service. Review each reported difference because a visual change is not automatically a meaningful editorial or legal change. Book centers, freelancers and developers can use this free local workspace without a login or paid conversion API. Keep the original and inspect the downloaded result.
Choose your files and review the settings.
Keep originals and inspect the result before printing. File changes clear previous downloads. Heavy image and OCR work can take longer on a phone.
Using Compare two PDFs visually
- Choose the earlier PDF first and later PDF second.
- Set rendering resolution and the pixel difference threshold.
- Create the reports and inspect the changed pages.
Behind the result
Corresponding pages are rendered at bounded resolution and compared pixel by pixel. The report summarizes changed area and page-count differences.
Free tools for everyday work
Book centers, photocopy shops, freelancers and developers can use this workspace without a paid plan or account. Files are processed locally. Prepare website resources from offline setup before disconnecting; Urdu/OCR also needs the separate pack above.
The Windows app currently includes the original four tools. The expanded tools are available on the website; app and extension updates will be separate releases.
Answers and practical details
Invisible differences
Hidden metadata, attachments and content outside the rendered view are not fully described by a pixel comparison. Use document inspection when those details matter.
Price and accounts
This website workflow is free without a login, subscription or paid conversion tier. Your browser supplies the processing memory and CPU.
Local file handling
Selected documents and generated results are processed on your device. QBMFX does not upload them to a conversion server or save them in a customer database. Hosting, advertising and opening external links are separate network activity.
Offline preparation
Prepare the supported website resources while connected, wait for the ready status and test the workflow before disconnecting. OCR, advanced PDF processing or fonts can need an additional local resource pack. Browser cleanup can remove saved resources.
Installed app availability
The Microsoft Store app and Edge package currently contain the original four tools. Website additions require a separate installed-package release and do not update those packages automatically.