Check if AI wrote this text.

How do I check if AI wrote it?

Paste the passage into the detector tool at the top of this page. You get a named verdict — Human-Written, AI-Assisted, or AI-Generated — and a score on every sentence. That is the practical way to check if AI wrote it: look at the lines, not just the headline percentage. Around fifty words is the floor. Confidence rises with length.

How do I check for AI generated text?

Use this page as an AI detection tool, not as a plagiarism checker. A plagiarism checker looks for overlap with existing sources. Checking for AI generated text asks whether the writing reads as generated text from a language model. Fully original AI generated content often matches nothing in a corpus, which is why a clean plagiarism report does not mean the draft is human written.

Can I check if the answer is AI generated?

Yes. Paste the answer — a chatbot reply, an essay paragraph, a support email — and run the scan. Checking if the answer is AI generated is the same job as checking any other passage: the detector scores generative AI patterns from AI models such as ChatGPT and Gemini, then shows you which sentences carried the signal. It will not name the model. It estimates whether the writing reads as AI written.

Was this AI generated text — can a detector actually tell?

Sometimes, and never as a courtroom finding. Asking "was this AI generated text" is a reasonable question about a draft you are holding. The honest answer is a probability plus the sentences behind it. AI detector tools disagree with each other. Short passages, non-native English, and heavily rewritten drafts are the hard cases. Treat the report as evidence to weigh, not as proof of authorship.

What is an AI detector?

An AI detector — sometimes called an AI checker or AI content detector — reads a piece of writing and estimates how likely it is to have been generated by a model such as ChatGPT, Claude, or Gemini. markhuman returns an overall probability, a plain-language verdict, and sentence-level highlights showing what the call was based on, so you can weigh the finding rather than take a number on faith.

How does the markhuman AI detector work?

It scores joint lexical and structural patterns across the document rather than relying on perplexity and burstiness alone, which are the two signals older detectors use and the two that a single paraphrasing pass defeats. Scores are produced for the whole document and for each sentence, then reconciled into one verdict. That is why a mixed document — some passages written by a person, some by a model — shows up as mixed or AI-assisted rather than collapsing to a single misleading average.

Does it catch humanized or paraphrased AI text?

That is the case it is specifically trained for. The training set includes AI text pushed through commercial humanizers and paraphrasers, mirrored against human originals, because that is the evasion route people actually use. It is still the hardest category — treat a borderline result on heavily rewritten text with more caution than a clean one. A synonym pass is much easier to call than a genuine structural rewrite.

How accurate is it?

It is tuned to minimise false flags on genuine human writing while still catching machine drafts, and it performs best on longer text. No detector is perfect, and we do not publish a headline accuracy figure because we have no third-party-verified number to stand behind. Treat the report as evidence to weigh — especially on short passages, non-native English, and heavily edited drafts — not as proof on its own.

What does the percentage mean?

It is the confidence that the text came from a model, not the share of AI words. Above roughly 70% reads as AI-generated, below about 30% reads as human, and the band in between is genuinely mixed — which is what the AI-Assisted verdict exists to describe. The verdict is calibrated per length band, so the same percentage on a 90-word snippet and a 700-word essay is not the same finding.

Is my text stored?

No. Text is processed in memory to produce the score and discarded when the response returns. Nothing is retained, nothing is used for training, and no account is needed to run a scan. The privacy policy in the footer is the longer version of that sentence.

Can I use a report as proof that someone used AI?

No, and please don't. A report is a probability estimate about a piece of text, not a finding about a person. Do not use it as the sole basis for an accusation, a grade, a disciplinary outcome, or a hiring decision. Weigh it against drafts, version history, and a conversation with the writer. The FAQ at /faq covers this in more depth.

The consequences of a false positive fall on a named person. The consequences of a missed draft are usually diffuse. That asymmetry is why process has to carry decisions. Teachers have a dedicated page for the sequence between a flag and a referral. Editors and hiring managers should apply the same caution: a short passage is a weak sample, and AI-Assisted is a description of a draft, not a character judgement.

Is the detector free, and do I need an account?

Yes, and no. 50 scans a day at up to 2,500 words each, no email and no card. Around fifty words is the floor. An account exists so a monthly word pool can follow you across devices, not as a gate on the tool. Unused words do not roll over. Signing in is not a trial that expires after a paragraph.

Will this match Turnitin, GPTZero, or Originality.ai on the same essay?

Not reliably, and no two detectors will. Different training data, different thresholds, different calibration — disagreement is a normal property of the field, not evidence that either tool is broken. We do not publish head-to-head pass rates because we have not measured them. If you need a specific scanner's read, run that scanner. Where tools split, look at the sentences; that is the tiebreaker we can actually offer.