When You Want to Compare Scanned PDFs

Published: Oct 19, 2026 | Updated: Oct 19, 2026 | About (Japanese)

A scanned PDF is a picture and has no text, so Compare Two PDFs (Find Differences) cannot compare it as it is.

Steps

1. Read the text of each file with Read Text from Images and PDFs (OCR).
2. Save the text and compare the contents.

Use "Compare Two PDFs (Find Differences)" (free)

Tools that go well with this

• Extract Text from PDF: Pull the text out of a PDF to copy or save.
• Merge PDFs: Combine several PDF files into one, in the order you choose.
• Read Text from Images and PDFs (OCR): Turn text in images and scanned PDFs into text.

More guides for this tool

• How to Compare Two PDFs (Free, Phone OK)
• How to Check the Changes in a Contract
• Compare Versions of a Résumé or Application
• What PDF Comparison Can and Cannot Do
• If No Differences Appear, or Too Many Do
• How Your PDFs Stay on Your Device When Comparing

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