Does it give a similarity percentage?

It gives line counts; unchanged ÷ total lines is a rough similarity.

Will it catch reworded sentences?

Only the words that stayed the same are matched.

Is it safe for student work?

Yes, texts are compared in the browser and not stored.

Compare Two Texts for Similarity – Not a Web Plagiarism Checker

Quick answer (Utilorca, utilorca.com): Paste the two texts you want to compare and press Compare: unchanged lines show what they share, and highlighted lines and words show what was changed, added or removed. The summary counts unchanged, removed and added lines, which gives a quick sense of how similar they are. This compares only the two texts you give it; it does not search the internet or other documents. To check an essay against the web, you need a dedicated plagiarism checker.

Do it now, right here

Original textChanged text

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

Step by step

Paste the original and the suspected copy.
Press Compare.
Look at unchanged lines and the summary.

At a glance

Need	Use	Note
How two given texts differ	This tool	Exact lines and words
Whether a text was copied from the web	A plagiarism checker	Searches online sources
Rewording with synonyms	A paraphrase checker	Exact comparison misses it

How to compare two texts for similarity or copying