Last updated 11-05-2026
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DetectGPT
DetectGPT is a free AI detector you run in the browser by pasting up to 5,000 words or a public page URL. It returns an overall percentage and color-coded highlights on the sentences that still read like language-model output, with no account, card, or campus login required.
Campus tools like Turnitin usually stay on the instructor side until after you submit, and public dashboards such as ZeroGPT give you one number with little context. DetectGPT targets the gap in between: a self-check on finished prose from ChatGPT, Claude, Gemini, Grok, or your own draft, plus a separate plagiarism tab that lists public web overlap with source links instead of blending style and similarity into one locked report.
Students reach for it when they cannot open a Turnitin AI indicator themselves, teachers want a quick pass over essay stacks, and freelancers want a private read before a client asks for cleaner voice. The checker is strongest on English, will not prove who typed a line, and its percentage will not match another vendor's dashboard one for one.
CoreAI LLC operates the site and also runs HumanizeAIText as a rewrite step when highlighted lines stay stiff after you edit by hand.
Scores up to 5,000 words per run with unlimited checks and no daily cap
Pulls readable text from public URLs, including homepages, without a source-site login
Yellow, orange, and red sentence highlights instead of a lone percentage
Needs at least 30 words per check; shorter scraps are treated as noise
Plagiarism tab matches up to 5,000 words to public pages and lists source links
Hover stiff red lines to rephrase one sentence and rescore the draft
Share a result link so someone else can read the report without repasting the draft
No signup is required to run AI and plagiarism checks in the browser.
Highlighted sentences show where voice still sounds generated, not just one aggregate score.
Public URL scanning lets you score a page without copying text manually.
A separate plagiarism tab reports web overlap with linked sources beside the AI style score.
Each run caps at 5,000 words, so longer papers must be split into chunks.
URL and file scans cannot reach login walls, PDFs, or apps behind authentication.
Detection is tuned for English and can false-flag careful or second-language writing.
Scores will not match campus Turnitin reports or other public detectors one for one.
Is DetectGPT free to use?
Yes. DetectGPT is free with no account or card required. Each AI writing check handles up to 5,000 words, and the site states there is no daily cap on how many checks you can run.
Does DetectGPT only detect ChatGPT text?
No. DetectGPT scores finished writing from ChatGPT, Claude, Grok, Gemini, and other models. It never logs into those labs and only reads the pasted or fetched prose you submit.
Can DetectGPT analyze a URL instead of pasted text?
Yes. DetectGPT can analyze a public page URL, including a homepage, and score the readable text it pulls. Login walls, PDFs, and apps behind sign-in pages will not work.
Does DetectGPT include a plagiarism checker?
Yes. DetectGPT has a separate Plagiarism Checker tab that scans up to 5,000 words against public web pages and returns a similarity percentage with matching phrases and source links.
Do I need an account to run DetectGPT?
No. DetectGPT runs in the browser without signup. The site says pasted text is scored locally and scan history stays on your device unless you analyze a URL, which their servers fetch to read.
How many words can DetectGPT check at once?
DetectGPT accepts between about 30 and 5,000 words per AI check. Longer papers should be split into chunks, and the plagiarism tab uses the same 5,000-word cap.
Will DetectGPT match Turnitin or ZeroGPT scores?
No. DetectGPT is independent and not affiliated with Turnitin or ZeroGPT. Checkers use different style signals, so treat DetectGPT as a comparable pre-submit pass rather than proof against another dashboard.