Does Adobe Acrobat compare PDFs?

Acrobat Pro has a Compare Files feature; it is a paid version.

Why do many lines show as changed?

PDFs break lines differently; tick Ignore extra spaces and compare paragraphs.

Are my PDFs uploaded?

No, you paste the text and it is compared in your browser.

How to Compare Text in Two PDFs – Free, In the Browser

Quick answer (Utilorca, utilorca.com): Open the first PDF, press Ctrl+A (Cmd+A on Mac) to select all the text, copy it and paste it into the left box; do the same with the second PDF in the right box, then press Compare. The tool shows removed and added lines and the changed words. It compares text only, so layout, fonts and images are ignored, and line breaks from the PDF can make differences look bigger than they are. Scanned PDFs have no text to copy; extract it first with an image-to-text tool.

Do it now, right here

Original textChanged text

Ignore upper/lower case Ignore extra spaces Show only the differences

Step by step

Copy all the text from each PDF.
Paste one version in each box.
Press Compare and read the changed lines.

At a glance

PDF type	Works?	Tip
Text PDF (from Word, etc.)	Yes	Copy and paste
Scanned PDF	Not directly	Use image to text first
Protected PDF	Only if copying is allowed	Ask for an unlocked copy

How to compare text in two PDFs