ChatGPT detector
What the ChatGPT detector does
The ChatGPT detector is a free ChatGPT AI detector: paste in a paragraph, essay, email or comment, and it checks the writing against habits typical of ChatGPT, OpenAI's assistant. It answers the question people type into a search bar, is this written by ChatGPT, with a plain-language list of what it found and why, not a single score dressed up as a verdict.
This is a server tool, not a browser script. Your text is sent to our AI server to be scored; you get 5 free checks in any rolling 24 hours. There's no account to create, and no text you paste is needed twice.
What comes back is a list, not a verdict. A detector that returns a bare number asks you to trust it blind; this one names each pattern it found (a scene-setting opener, a tricolon, an unusually tidy structure).
How it works
How to check text for ChatGPT writing in three steps
It takes less time than reading the result does. There's no file upload, no formatting to strip out first, and nothing to configure before you run the check: paste, run, read.
- Step 1
- Paste the text you want checked. A paragraph is enough to run; a full page gives the check more to work with.
- Step 2
- Press Check text. It goes to our AI server once, gets scored against ChatGPT's writing patterns, and the result comes back to the page.
- Step 3
- Read each flagged signal and the reason behind it, then judge for yourself. The detector explains its reasoning; it doesn't hand down a ruling.
ChatGPT's writing patterns
How ChatGPT's writing actually differs
ChatGPT's training and instruction-following habits leave a recognisable shape behind, distinctive enough to look for on purpose. None of these prove anything alone: stacked across a page, they're what a ChatGPT checker reads for.
- Scene-setting openers
- “In today's fast-paced world” and its relatives. A first sentence that would fit almost any topic is a sentence a model wrote.
- The tricolon reflex
- Three items in a row, almost by rule, “clear, concise and effective,” even where two would say it.
- The negation pivot
- “It's not just X. It's Y.” Sharp once, comical three times on a page, and ChatGPT reaches for it often.
- Borrowed vocabulary
- Delve, tapestry, realm, testament, landscape. Fine alone; a signature when clustered.
- Numbered-list instinct
- A tendency to answer even a simple question with a tidy numbered list, whether the content calls for structure or not.
- A closing summary paragraph
- A wrap-up that restates the piece, common in ChatGPT's default long-form answers and rare in ordinary human writing.
Straight answer
Can you tell which AI model wrote something?
Not with certainty. ChatGPT, Claude and Gemini train on overlapping data and keep converging on similar phrasing, so the tells that separate them are a matter of degree, not a fingerprint.
A system prompt changes almost everything, too: tell a model to write short, blunt sentences with no hedging, and most of its default profile disappears. That's why this tool reports patterns typical of ChatGPT's default voice, not a claim about which model, or which person, wrote a piece of text. Treat a match as a lead worth a closer look, never an answer on its own.
Why flags happen
Why false positives happen
The patterns a ChatGPT checker looks for are also, in places, just good writing. A tricolon is a legitimate rhetorical device that plenty of human writers reach for on purpose. A rigid house style that favours tidy structure and numbered lists reads the way ChatGPT does, for reasons that have nothing to do with a model.
Second-language writers get flagged often, and it isn't fair. Formal connectors and clear, structured prose are exactly what an ESL course teaches, and what a good editor asks for. A false positive here isn't a flaw in the writer; it's a flaw in treating tidy, structured prose as proof of anything by itself.
If you're flagged
What to do if you're accused of using ChatGPT
A flag is a signal, not a verdict; no one should treat it as one on its own. If someone has raised it against your work, the strongest response is evidence of your process, not an argument about the detector.
- Keep your drafts
- Earlier versions, outlines and notes are the plainest evidence a piece grew, rather than appearing whole.
- Keep version history on
- Google Docs, Word and most editors log revisions automatically. Don't clear it while a question is open.
- Be ready to talk through the work
- Someone who wrote a piece can usually explain a specific choice in it. That's harder to fake than the prose itself.
- Ask what the flag actually found
- A named signal (a tricolon, a cluster of borrowed vocabulary) can be discussed on its merits. A bare score can't.
Who uses it
Who uses the ChatGPT detector, and when
Same tool, several reasons to open it.
- Editors and publishers
- Screening submissions for signs of an unedited ChatGPT draft before it reaches a human editor's time.
- Teachers
- Getting a second opinion on writing that reads unusually polished, as one input among several, not a grading tool.
- Hiring teams
- Checking a writing sample or cover letter for a voice that doesn't match the interview.
- Writers checking their own work
- Running a draft through before submitting it, to see whether their own habits read as machine-made.
- Community moderators
- Getting a quick read on a wall of posts that all arrived sounding oddly alike, before deciding whether to look closer.
Free checks
How many free ChatGPT detector checks you get, and why
This is a server tool: your text travels to our AI server to be scored against ChatGPT's writing patterns, then the result travels back. That round trip makes the check possible, and it's why there's a limit on it.
You get 5 free checks in any rolling 24 hours, tracked without an account. No plan to buy, no signup wall, just a ceiling that resets on a rolling clock, not a fixed hour each day.
Five is enough for most real uses of a ChatGPT detector: one submission, one email, one flagged paragraph at a time. If you're checking dozens of pieces in a single sitting, spread them out: the window rolls forward continuously, not in a fresh batch of five at midnight.