Is Compare available in Word for Mac?

Yes, under Review › Compare Documents.

Why does Word show so many changes?

Formatting and spacing changes count too; compare plain text here to see only word changes.

Are my texts uploaded here?

No, the comparison runs in your browser.

How to Compare Two Documents in Word

Quick answer (Utilorca, utilorca.com): Word has a built-in comparison: open Word, go to Review › Compare › Compare, choose the original document and the revised one, and Word creates a new document showing every change as tracked changes, with a list of revisions on the side. It also compares formatting. If you only care about the words, or the texts are not Word files, copy both versions and paste them into the boxes above, then press Compare: it is quicker and shows changes line by line and word by word.

Do it now, right here

Original textChanged text

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

Step by step

In Word: Review › Compare › Compare.
Pick the original and the revised document.
Or paste both texts above and press Compare.

At a glance

Method	Compares	Best for
Word Review › Compare	Text and formatting	Two .docx files
This tool	Plain text only	Quick checks, any source
Word Track Changes	Changes as you edit	Editing with others

How to compare two texts or documents in Word