DetectGPT is a free online AI writing detector and plagiarism checker designed to help students, teachers, writers, publishers and content creators evaluate written content.

Its AI detection tool analyses submitted text to identify writing patterns that may resemble AI-generated content. Users can paste their writing or enter a public webpage URL to receive an AI-writing percentage and a report highlighting passages that appear machine-generated.

The platform supports content produced by ChatGPT, Claude, Gemini, Grok and other large language models. It does not need access to the original AI conversation or writing prompt; it analyses the finished text supplied by the user.

DetectGPT also includes a plagiarism checker that searches for matching phrases across publicly available web pages and provides links to potential sources. This allows users to investigate similarities and review possible overlaps in their writing.

Additional features include color-coded passage highlighting, shareable reports, document uploads and an AI text humanizer for rewriting content that sounds overly generated.

The tool works directly in a web browser without requiring an account or institutional login. It is useful for students reviewing assignments, teachers examining written submissions, bloggers checking articles and professionals reviewing AI-assisted drafts before publication.

Importantly, DetectGPT's AI score is an indicator of writing patterns, not proof of authorship or academic misconduct. Its plagiarism checker is also a public-web similarity tool, not an institutional plagiarism database.

Free