Plagiarism Checker Plus checks your Google Docs™ document for plagiarism and AI-written text, then highlights the matching passages right in your doc so you can fix them before you submit.

WHAT IT DOES
• Plagiarism check: a similarity score plus the matching web sources, grouped by site with how much of your document each one covers.
• AI detection: an overall AI score and the passages most likely written by AI, marked Highly likely, Likely or Possible.
• Highlight in document: turn on highlighting to colour matched or AI-likely passages in the doc. Clear removes only our highlights.
• Click any result to jump to that text in your document.
• Check the whole document or just the part you've selected.
• Leave out quotations and your reference list so properly quoted text isn't counted against you. Excluded text isn't sent or charged.
• Cite a source: look up a web page, DOI or ISBN, choose APA, MLA, Chicago, Harvard, IEEE or another style, then insert the citation at your cursor.
• If you edit the document after a check, the add-on tells you and offers a re-check.

HOW TO USE IT
1. Install the add-on, open a document and go to Extensions > Plagiarism Checker Plus > Check this document.
2. Sign in to your free Plagiarism Checker Plus account.
3. Choose plagiarism, AI detection or both, and click Check.
4. Review the results in the sidebar and turn on highlighting.

PRIVACY
The add-on reads only the document it's opened in. Your text is sent to our servers only when you click Check, and it is not sold or used to train AI models. Sign out from the sidebar at any time, or remove access at myaccount.google.com/permissions. Full details: plagiarismcheckerplus.com/privacy

A NOTE ON RESULTS
No detector is perfect. Treat scores as a guide for reviewing your writing, not as proof of misconduct, and always read the matched sources yourself.

Free to start; paid plans add more words per month.

Google Docs™ is a trademark of Google LLC.