Free AI Content Detector
Get an AI likelihood reading. Up to 300 words a day, free, no account.
How to check text for AI
You do not need an account, a card or an email address. A check takes about a minute.
- Paste at least 50 words of English into the box. The checker reads up to 300 words a day for each network.
- Select the Check for AI button. A short human check runs first, then your text goes to our detection provider for scoring.
- Read the AI likelihood and the band next to it. The number runs from 0 to 100, and a higher number means detectors read the text as more machine-written.
- Decide what to do next. If the reading is high, edit the passage yourself or try a rewrite, then paste the new version to see how the reading moved.
What your result means
The result is one number called AI likelihood, from 0 to 100. It shows how likely detectors are to read your text as AI-generated, so a lower number is better if you want writing that reads as human.
There are three bands, and each one has a text label as well as a color. Under 50 reads as human. A reading from 50 to 60 is possible AI, which means the text sits close to the line. Over 60 is likely AI.
Sample
- Reads as human
- under 50
- Possible AI
- 50 to 60
- Likely AI
- over 60
A sample reading. It shows what a result looks like, not a measured outcome.
A reading is a reading of the text, not a verdict on the author. It comes from a multi-detector model, so it is an estimate, and another detector can read the same text differently. We do not publish an accuracy figure and we do not guarantee any result.
Length matters. Under 200 words, detectors have less to go on, so the page marks the reading as less reliable. For a steadier reading, check 200 words or more.
Who checks text for AI, and why
People check text for AI for different reasons. Writers and students run their own drafts through a detector before they send or publish them, so a stiff or over-polished passage does not come as a surprise later. Editors and content teams use a reading as one input when they review a freelancer's article or an agency draft, next to the usual checks on sources and facts. Anyone who works with AI drafts can paste a rewrite to see how it changed the reading. In every case the reading is a prompt to look again, not a ruling. It cannot show how a text was made, so it should not be the only reason to accept or reject someone's work.
What counts toward your free words
The free allowance is up to 300 words a day for each network, counted across all of your checks. A network is the connection your device uses to reach the internet, so people on shared Wi-Fi, such as a campus or an office, share one allowance.
Readings under 200 words are less steady, so one check of 200 words or more tells you more than several short ones. If you have a longer piece, paste the passage you are least sure about, or a representative middle section, rather than the introduction.
- Only the words that get checked count. If you paste more than you have left, the page checks the first part and tells you how many words that was.
- A check needs at least 50 words. If fewer than 50 words are left for the day, they cannot be used.
- The allowance resets every day at 00:00 UTC. The page shows that time in your own time zone when you reach the limit.
- If a check fails on our side we restore the words, up to three times a day for each network.
- The checker reads English only.
Free checks and paid checks
The free page is a short version of the detector in the app. Here is how the two compare.
- Free page
- Up to 300 words a day for each network. No account and no card. You get the AI likelihood and its band.
- Paid plans
- Check up to 30,000 words at a time. Basic allows 20 checks an hour, Standard 60 and Premium 120. The app adds more detail to each reading.
- What a paid check costs
- A paid check uses 10 percent of the words you check, rounded up to the nearest 10, with a minimum of 10. Checking 300 words uses 30 words from your plan.
- A free account
- An account on its own does not add detector checks. It includes one Humanize job of up to 300 words, which rewrites text instead of only measuring it.
How AI content detectors work
An AI content detector is a statistical model. It is trained on large samples of human writing and machine-generated writing, and it learns which patterns tend to separate the two.
Two patterns matter most. The first is predictability. Language models pick likely next words, so their text tends to be smoother and less surprising than a person's. The second is variation. People mix short and long sentences, change pace and reach for an odd word, while machine text often keeps an even, tidy rhythm. Detector write-ups call these perplexity (how predictable the words are) and burstiness (how much sentence length and structure vary).
The detector turns those signals into a likelihood, not a yes or no. A multi-detector model, like the one behind this page, combines several detectors and reports one number. That number is a statistical estimate, not proof of who or what wrote the text.
Because the signals are statistical, they are weakest when there is little text to measure. A single paragraph gives a model much less to work with than a full page, which is why the checker asks for at least 50 words and marks readings under 200 words as less reliable.
How accurate are AI detectors?
No AI detector is fully accurate, and none can tell what a writer intended or how a text was made. It only sees the finished words. Every detector makes mistakes in both directions: it can flag writing a person produced, and it can miss text a model produced. We do not publish an accuracy figure for this checker and we do not guarantee any result.
Some kinds of text make errors more likely.
- Short text
- With little to measure, a reading can swing a long way on a few sentences.
- Mixed or edited text
- A draft that was part machine-written and then reworked by hand has no single clean pattern, so the reading often lands in the middle.
- Formal, tightly edited writing
- Clear, careful prose can look statistically similar to machine output.
- Non-native English writing
- A 2023 Stanford study found that detectors flagged writing by non-native English speakers as machine-written more often than writing by native speakers.
Treat a reading as one signal, not a ruling. If a number surprises you, read the text again and look for the most generic passages. If you are judging someone else's work, a detector reading alone is not enough to decide anything.
If your text reads as AI
A high reading does not mean you did something wrong. It means the text has the even, generic texture that detectors look for. If you wrote it yourself, formulaic or over-polished phrasing is a common cause. If a model drafted it, a few changes can make it your own.
- Add specifics only you know: a number, a name, a place or an example from your own work.
- Vary your sentences. Mix short and long ones, and cut filler openers and stock phrases.
- Replace general statements with your actual position, in the words you would say out loud.
- Keep your drafts and version history. Dated drafts show how you wrote something better than any score can.
Then paste the new version to see how the reading moved, while you have free words left. If your school or workplace has a policy on AI tools, follow it.
AI detector and humanizer: check, then rewrite
This page only checks. TurnItHuman's other tool, Humanize, rewrites AI-generated text in a more natural voice, then shows you the new AI likelihood so you can see what changed. It also lists numbers, names and citations that look altered, so you can compare them with your original. Use it on text you have the right to edit.
A common flow is to check a passage here, edit or humanize it, and check it again. A free account includes one Humanize job of up to 300 words, so you can try a rewrite on the same passage before you decide whether you need a plan. Read the result before you use it, and do not treat any score as a promise of how another detector will read the text.
What happens to the text you paste
Your text is sent to our detection provider to produce the score. We do not store it and we do not keep the score. The provider handles submitted text under its own policy, so do not paste anything confidential.
To enforce the daily limit we keep a keyed hash of your network address, not the address itself, with a word count for up to 3 days. Nothing we keep links that address to what you pasted, because we keep neither the text nor the result.
FAQ
Free AI detector questions
Is there a truly free AI content detector?
Yes. You can check up to 300 words a day for each network with no account and no card. Each check calls a paid detection service, so the free allowance is limited. Plans cover longer texts and more checks.
Is there an AI content detector with no sign up?
Yes. This one needs no account for up to 300 words a day. Longer texts and more checks need a plan.
How do AI content detectors work?
Detectors are trained on large samples of human and AI-generated text. They look at patterns such as how predictable each word is and how much sentence length and structure vary, then return a likelihood that the text was machine-written. That is a statistical estimate, not proof of who wrote it.
How accurate is this AI detector?
It is an estimate. Our score comes from a multi-detector model, and every detector makes mistakes in both directions. It can flag human writing and miss edited AI text. Short texts are the least reliable, which is why we mark anything under 200 words. We do not publish an accuracy figure and we do not guarantee any result.
Why is my own writing flagged as AI?
Clear, formal and tightly edited writing can look statistically similar to AI output. A 2023 Stanford study found that detectors flagged writing by non-native English speakers more often. If a detector flags your own work, keep your drafts and notes, since version history is stronger evidence than any score.
Coverage of the Stanford study on detector bias (opens in a new tab)What does the AI likelihood score mean?
It is how likely detectors are to read your text as AI-generated. A reading below 50 reads as human, 50 to 60 is possible AI, and above 60 is likely AI. It is a reading of the text, not a verdict on the author.
Can I check my text against Turnitin for free?
No. Turnitin does not provide a public API, so this detector cannot run your text through it and does not measure Turnitin. Be careful with any site that claims to show your Turnitin score. We do not guarantee any detector result.
How many words can I check for free, and what happens after?
Up to 300 words a day for each network, counted across all your checks. If you paste more, we check the first part and tell you how many words that was. The allowance resets at 00:00 UTC. To keep checking beyond it, sign up and choose a plan. A free account alone does not add detector checks: it includes one Humanize job of up to 300 words. If a check fails on our side we restore the words, up to three times a day for each network.
What is the catch? Why is it free?
Each check costs us money because it calls a paid detection service. The free allowance lets you try the detector before you decide whether you need a plan. There is no card to enter.
Is my text stored?
We do not store the text you paste here. It is sent to our detection provider to produce the score, and the provider handles it under its own policy, so do not paste anything confidential. We keep a keyed hash of your network address with a word count for up to 3 days to enforce the daily limit.
Read the privacy policyIs an AI detector the same as a plagiarism checker?
No. A plagiarism checker looks for text copied from existing sources. An AI detector estimates whether the writing pattern looks machine-generated. A text can be original and still be flagged, or copied and not flagged.
What should I do if my text is flagged?
Read it again and edit it in your own voice: add specific details, vary your sentences and cut filler. Keep drafts and version history of your work. If you want help rewriting, Humanize edits the text and shows you the new AI likelihood. A free account includes one job of up to 300 words.
Can this tell if ChatGPT wrote my text?
It estimates whether text reads like machine-generated text. It cannot name the tool that produced it or prove who wrote it, and edited or mixed text is harder to read reliably.
What about AI-generated text and Google?
Google's published guidance focuses on whether content is helpful rather than on how it was produced. Read Google's own page for the details.
Google's guidance on AI-generated content (opens in a new tab)Need to check longer texts?
Plans check up to 30,000 words at a time, with more detail in the app. Want to rework a passage first? A free account includes one Humanize job of up to 300 words.
No card needed to start. Free checks reset every day at 00:00 UTC.