Overall signal
A quick view that shows where to start.
Free to use. No sign-up.
GPT Zero,the free AI detector
GPT Zero checks whether text appears to be AI generated. Paste an essay, article, or draft to see its AI score and the sentences that show signs of generated writing.
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Up to 45,000 characters
No account needed
Sentence-level detail
Up to 45,000 characters
How it works
What the score is looking at
The detector compares patterns, not ideas or intent. It looks for several signals across the passage and weighs them together.
01
Word choice
Generated text often stays close to the most likely next word. Less predictable wording can point the other way.
02
Sentence rhythm
People tend to change pace, length, and structure. Generated passages often settle into a steadier pattern.
03
The passage as a whole
The service combines those signals across the full sample. No single word or sentence decides the result.
What the check includes
More than one percentage
The detector gives you several views of the same passage so you can understand the result and decide what deserves another read.
Sentence detail
See where the signal changes inside the passage.
Word choice
Notice wording that follows highly predictable choices.
Sentence rhythm
Compare changes in length and structure.
Current model families
Review patterns associated with ChatGPT, Gemini, Claude, Llama, and similar tools.
Human review
Use the result with context, sources, and the writing process.
Coverage
Built for writing from the AI tools people use most
We check patterns commonly found in text from ChatGPT, Claude, Gemini, Llama, and similar tools. Model families change often, so we do not pretend a score can name the exact model with certainty.
ChatGPT
Claude
Gemini
Llama
Jasper
Use it free
Free to use, without a sign-up wall
Paste a draft, run the check, and read the result. You do not need a card or an account to start.
- No account required
- No card required
- Up to 45,000 characters per check
Example result
Reading the result
43%
AI signals
More human-like pattern
Mixed pattern
More predictable pattern
More human-like pattern
Reading the result
One number is not the whole answer
The overall score tells you where to start. The sentence view shows where the signal changes and which paragraphs deserve a second read.
How to read a scoreReading the signals
The score looks at patterns, not intent
Human and generated writing can share traits. The useful move is to look at several signals together and return to the context before drawing a conclusion.
Signals that often vary in human writing
- Natural changes in sentence length
- Unexpected wording or personal turns of phrase
- A tone that shifts with the idea or the moment
Signals that can appear in generated writing
- Highly predictable wording from sentence to sentence
- A similar rhythm across whole paragraphs
- Repeated connectors and an unusually even structure
Inside the check
Read the result sentence by sentence
Each sentence receives a signal so you can see where the pattern changes. Many documents mix original writing with a few edited or generated paragraphs; the detail shows you what deserves a closer look.
Learn how it worksWhy use it
A useful check without turning it into a verdict
The page does a few important things and keeps the limits in plain sight.
Find the paragraph worth rereading
Sentence-level detail helps you spot a shift in style without rewriting the whole document.
Start without making an account
Open the page, paste the text, and run the check. There is no registration form before the result.
Read the reason, not just the percentage
The result separates word choice, rhythm, and structure so you can see where the signal comes from.
Keep the limits in view
A detector can be wrong, especially with short, technical, or second-language writing.
Students and educators
Check your own draft before you hand it in
Formal academic writing can look predictable even when it is original. See which sentences might raise a question, then decide whether they still sound like you.
- Look at the exact sentences, not only the overall score
- Discuss the writing before making a claim about its author
Writers and editors
Know what arrived in the draft
If you work with contributors, a quick check can point to the paragraphs worth questioning, verifying, or editing before publication.
- Spot a change in rhythm or voice within one document
- Use the signal to start a conversation, not an accusation
A necessary note
Useful signal. Not proof.
AI detection is probabilistic. Human writing can score high, and generated writing can pass unnoticed. Do not use one score to punish a student, reject a candidate, or accuse a writer. Read the passage, ask for context, and combine more than one kind of evidence.
Read our methodologyCommon questions
Clear answers before you paste a draft
Is the detector free?
Yes. You can use the checker on this page without an account or credit card.
How reliable is an AI score?
It is an estimate, not a certainty. Results are usually more useful for several paragraphs and can vary by language, subject, and writing style.
Is the text I paste stored?
Your text is sent to the detection service to produce a result. Do not paste private information, personal data, or confidential material. See the privacy policy for details.
Can I check Spanish writing?
Yes, although performance can vary across languages and types of writing. Use a complete passage and always review the context.
Does a high score prove someone used AI?
No. A score can justify a closer read or a conversation, but it cannot prove authorship on its own.
How much text can I check?
The form accepts between 50 and 45,000 characters per check.
Have a draft ready?
Paste it above and check the parts that deserve a second look.