Plagiarism Checker Plus, where you already write
Check for plagiarism and AI writing, and cite your sources, without copying between tabs — with our Chrome extension, Google Docs add-on and API.
Pick where you want to check
Your text is only sent when you ask for a check.
Check and cite anywhere you write
A Check button in the text box you are writing in, a check bar for any text you highlight, results in a side panel, and one-click APA, MLA, Chicago or Harvard citations for the page you are reading.
Check your document without leaving Docs
Check a whole document or a selection for plagiarism and AI writing, see matches highlighted right in your doc, leave out quotes and your reference list, and insert citations at your cursor.
Add plagiarism and AI checks to your own app
Submit text from your own code and get a plagiarism score with matching sources and an AI score with per-sentence verdicts back as JSON. Included in every paid plan.
POST /api/public/v1/scans
{
"text": "The text you want to check…",
"tools": ["plagiarism", "ai_detect"]
}
202 Accepted
{ "id": "3f6c1e2a-…", "status": "processing" }Prefer the browser? Use the web app.
Paste or upload your text at app.plagiarismcheckerplus.com, or read the Help Center for step-by-step guides.