How to use this PDF tool
- Select exactly two PDF files.
- Review the selected filename and run the tool.
- Check the results, then download the new file or report.
- Open the download separately to verify it.
What this tool does
Compare two PDFs page by page using rendered pixel differences, report changed pages and similarity, and download a CSV comparison report.
Practical limit: This is a visual comparison. It does not prove semantic equality, and small font-rendering differences may affect the score.
Supported formats and limits
Input: standard PDF files readable by PDF.js. Output: a locally generated inspection report. Encrypted, damaged, or XFA-heavy files may not work.
Tips for better results
- Keep an untouched backup of the original.
- Process large documents on a desktop browser with free memory.
- Verify sensitive documents in a second PDF reader.
FAQ
Does compare two pdfs upload my document?
No. Processing runs in your browser. The page does not send the selected PDF to a document-processing server.
Can this tool open a password-protected PDF?
No. Remove the password with the correct credentials before using this page. Encrypted files may fail during parsing.
Will the downloaded result preserve every advanced PDF feature?
Standard pages are supported, but complex XFA forms, unusual embedded objects, and vendor-specific metadata may not be preserved.
What should I do with a very large PDF?
Try a smaller file or split the document first. Browser memory limits vary by device, page count, and image resolution.
How can I verify the result?
Open the downloaded file in a separate PDF reader and inspect the relevant pages or properties before sharing it.
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Processing notes
This is a visual comparison. It does not prove semantic equality, and small font-rendering differences may affect the score.