How to use this PDF tool
- Select the before and after PDF files.
- Review the available settings and choose values for your job.
- Run the tool and inspect the result summary.
- Download the newly generated report.
PDF Before and After Preview
Compare two PDFs page by page with synchronized before-and-after previews and a downloadable comparison report.
PDF Tool
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What this tool does
Compare two PDFs page by page with synchronized before-and-after previews and a downloadable comparison report.
The source remains unchanged. Browser checks are practical screening aids, not a substitute for certified prepress validation.
Supported formats
Standard PDF files supported by PDF.js and pdf-lib. Encrypted, damaged, XFA, and unusually complex files may not load.
Tips for better results
- Save a backup before changing print order or layout.
- Test one or two sheets before a long print run.
- Use a desktop browser for image-heavy PDFs.
FAQ
Can PDF Before and After Preview process password-protected PDFs?
No. Remove the password with the document owner's permission before using this browser-based tool.
Does PDF Before and After Preview upload my document?
No. Processing runs locally in your browser; the page does not send the selected PDF to a server.
Why can browser PDF inspection differ from a prepress application?
Browser libraries expose common page, font, image, and drawing data, but they do not perform full PDF/X or RIP validation.
What happens with a very large PDF?
Large or image-heavy files can use substantial memory. Close other tabs and process a smaller page range if the browser becomes slow.
Will PDF Before and After Preview preserve links, forms, and annotations?
Inspection tools do not modify the source. Layout tools preserve visible page appearance, but interactive features may not remain interactive.
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Processing notes
Progress and errors appear in the output panel. Reset releases generated download URLs and clears the selected files.