DetectGPT is a free AI writing checker that analyzes text from ChatGPT, Claude, Gemini, Grok, and other AI models. Users can paste up to 3,000 words or scan a public URL to get an AI writing score and highlighted passages. It also includes a plagiarism checker for finding matching phrases on public webpages.

• AI Content Detection: Checks whether written content shows signs of AI generation from ChatGPT, Claude, Grok, Gemini, or other language models.
• No Account Required: Run an AI check without creating an account or signing in through a school or campus login.
• 3,000-Word Limit: Scan up to 3,000 words in a single check, with the option to divide longer content into multiple scans.
• URL Analysis: Analyze readable text directly from public webpages, including homepages, articles, and public posts.
• AI Writing Score: Receive a percentage score indicating how much of the text appears machine-written, along with highlighted passages for closer review.
• Highlighted AI Passages: Easily identify which sections triggered the detector to see which sentences may need rewriting.
• Fast Results: Scan up to 3,000 words in under a minute.
• Works with Any LLM Draft: Check finished text from various AI writing tools without needing access to the original AI account or prompt.
• Private Self-Checking: Text pasted directly into the checker is scored in the browser, whereas URL scans require DetectGPT's servers to fetch the public page.

• Free to Use: DetectGPT offers AI detection without requiring an account, subscription, or school login.
• No Signup Required: Users can paste text and run a check directly in their browser.
• Works with Major AI Models: It checks writing produced by ChatGPT, Claude, Grok, Gemini, and other language models.
• Easy-to-Read Reports: Results include an AI writing percentage alongside highlighted passages that may sound machine-generated.
• URL Checking: Users can analyze text from public webpages without copying the entire article into the checker.
• Plagiarism Checking: A separate checker scans for matching phrases across public webpages and provides source links.
• Simple Results: Reports provide an AI writing percentage and highlighted lines that are easy to review.

• 3,000-Word Limit: Longer documents must be split into smaller sections.
• Not Proof of AI Use: The score indicates writing patterns and cannot prove who wrote the content.
• False Positives Can Occur: Formulaic writing, short text, and second-language writing may trigger AI signals.
• Limited File Support: It does not scan images, slides, or scanned PDFs directly.

• Students: Check essays and assignments before submission, especially when AI tools were used during drafting.
• Bloggers and Content Writers: Find sections that sound machine-written and rewrite them in a more natural voice.
• Marketers: Review website copy, articles, and marketing drafts before sending them to clients or publishing them.
• Editors: Quickly identify passages that may need a more natural writing style during content reviews.
• Second-Language Writers: Use the score as a writing aid to spot stiff or repetitive phrasing, while keeping in mind that false positives can occur.
• Website Owners: Check public webpages by URL to review how published content reads from an AI-detection perspective.