AI Detector: Was This Text Written by AI?
Paste a text of 200 to 10,000 characters: the tool estimates how likely it is to have been written by AI, highlights the sentences that look the most like it and explains why. A reading aid that is upfront about its limits: a clue, never proof.
- Score from 0 to 100%
- Highlighted sentences
- Up to 10,000 characters
- Free, no sign-up
Your text is sent for analysis — To be analyzed by the AI, the text you paste is sent to our server. It is used only to produce the result and is not kept afterwards. Avoid including highly sensitive information.
How can you tell if a text was written by AI?
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Paste the text
Copy the text you want to check into the box: 200 characters at least (two or three sentences) and 10,000 at most, which is about 1,600 words. The longer the text, the more meaningful the estimate.
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Run the analysis
Click “Analyze text”. The AI reads the text the way a careful proofreader would: style, structure, repetitive phrasing. Allow 5 to 25 seconds.
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Read the result
You get an AI probability percentage and a verdict, the text highlighted sentence by sentence, the clues that shaped the estimate and a few writing-style stats. Tap a sentence to see its own score.
A detailed result, with explanations
A clear score and verdict
A 0 to 100% gauge shows how likely the text is to come from AI, with three verdicts: probably human (under 35%), mixed or edited (35 to 64%), probably written by AI (65% and above).
The text, sentence by sentence
The most “machine-like” sentences are highlighted in red, the doubtful ones in orange, and the rest are left alone. Hover over or tap a sentence to see its percentage: ideal for spotting a pasted passage in an otherwise personal text.
The clues, explained
The tool gives you more than a number: it lists 2 to 5 concrete clues (stock transitions, an even tone, no personal example, sentences of the same length…) so you can judge for yourself.
Writing-style stats
Word and sentence count, average sentence length, shortest and longest sentence, regularity: these measures are calculated right in your browser and complete the analysis.
How does this AI content detector work?
A text generated by AI often has a “signature”: sentences of very similar length, predictable connectors (“moreover”, “furthermore”, “in conclusion”), smooth vocabulary, ideas laid out in balanced lists, few first-hand examples and almost no hesitation. This free AI detector has your text read by an AI trained to spot those marks, the way an experienced reader would. It gives an overall score, a score for each sentence and the clues that guided it. At the same time, your browser calculates simple statistics, including how regular the sentences are: people naturally alternate short and long sentences, while generated text is often very even. The detector analyzes the text in its original language, whether that is English or another language.
Are AI detectors accurate?
Let's be honest: no AI detector is 100% accurate, ours included. It produces an estimate, not proof. False positives happen: a very formulaic essay, a paper that follows a memorized outline to the letter, text written by someone who is not a native English speaker, or a very short text can be flagged as “AI” even though it was written by hand. Conversely, a generated text that has been reworked well can pass as human. That is why the score should never be used on its own to punish anyone, whether a student, a job applicant or an employee. Use it as a starting point for a conversation: ask for drafts, the version history, or have the person explain the content out loud.
How to read the analysis result
Look at the verdict first, then at the details. A high overall score with nearly every sentence in red points to a text that closely resembles AI output. A mid-range score with a few highlighted sentences here and there suggests a mixed text: partly written by a person and partly with AI, or generated and then edited. The listed clues tell you what tipped the scales, so check them against the text. Finally, the writing-style stats give you an objective benchmark: sentences that all run 18 to 22 words are unusual for a person. If the text is under 200 characters, the analysis does not run: with two sentences, no serious estimate is possible.
What is an AI text detector used for?
There are plenty of uses. A student can proofread an essay, term paper or thesis before handing it in and spot the passages that sound too “machine-made”, for instance after using AI to help with an outline or a rewrite. A teacher can get a first impression of a paper while keeping the tool's limits in mind. A recruiter can look at a cover letter, an editor at a submitted article, a shop owner at customer reviews that all sound alike. And anyone can check a text received by email or read online. If the result looks too artificial for your own text, the “Humanize this text” button sends it to our tool, which rewrites it in a more natural style.
Frequently Asked Questions
Is the AI detector really free?
Yes. The detector is free and needs no sign-up: paste your text, click “Analyze text” and the result appears in a few seconds. You can analyze several texts in a row.
Does the result prove a text was written by AI?
No. No detector can prove it: this is an estimate based on the style of the text. False positives are possible, especially for very formulaic texts, short texts and texts written by people who are not native speakers of the language. Never punish anyone on this result alone.
Why is my handwritten text flagged as AI?
A very structured text with neutral vocabulary and even sentences looks like what an AI produces, even when a person wrote it. This is common for papers that follow a strict method. Look at the clues provided: adding personal examples, varying sentence length and avoiding stock phrases makes a text more personal.
How long does the text need to be?
At least 200 characters, which is two or three sentences, and at most 10,000 characters, about 1,600 words. For a thesis or a long report, analyze it in parts: you will also see which parts raise questions.
Does the detector work in languages other than English?
Yes. The text is analyzed in its own language (French, Spanish, German…) and the explanations appear in the language of the page. The principle and the limits stay the same.
Can I check an image or a PDF file?
No, this tool only analyzes text. For a PDF or a Word document, copy the text and paste it into the box. For a scanned PDF, run it through a text recognition (OCR) tool first.