AI vocabulary and stock phrases
Finds words and phrases that AI writing tools overuse, such as “delve”, “crucial” and “it’s important to note”, and lists every one it found.
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AI writing detection
Free AI Content Detector: Check If Text Is AI-Generated
Paste an essay, article or blog post and find out if it reads like ChatGPT or another AI writer. Textgrain scores 19 writing patterns, highlights the sentences that look machine-written and explains every result.
- Free, unlimited checks
- No sign up or account
- Your text never leaves your device
- Every flagged sentence explained
AI text checkerPaste at least 250 words of English text
0 of 250 words minimum. Add 250 more.
How to check if text is AI-generated
Checking an essay or article for AI writing takes less than a minute.
- 1
Paste your text
Copy at least 250 words of the essay, article, blog post or email you want to check and paste it into the box.
- 2
Run the AI check
Select Check for AI. The text is analysed in your browser in about a second and never leaves your device.
- 3
Read the AI score
See whether the writing is likely human, mixed or likely AI-generated, with a pattern score from 0 to 100 and a confidence level.
- 4
Review flagged sentences
Sentences with AI writing patterns are highlighted. Select one to see exactly why it was flagged, then open each signal for the evidence.
What the AI detector checks
Instead of a black-box percentage, Textgrain measures the specific habits of AI-generated text and shows its working.
Sentence rhythm and burstiness
Measures how much sentence length varies. People mix long and short sentences, while AI text tends to keep a steady, even rhythm.
Hedging and vague generalities
Counts phrases like “can change”, “may vary” and “the relevant details” that make AI content sound careful but say little.
Lack of concrete specifics
Checks how many distinct names, numbers, dates and places the writing contains. Generic AI filler tends to stay abstract.
Template structure
Spots AI article outlines: many subheadings, one or two sentences per section, and headings that do not match the text below them.
Contrast framing and question bursts
Detects “not X, but Y” constructions and runs of rhetorical questions, two habits of recent AI models.
Formatting left over from chatbots
Flags markdown bold, bullet lists, “Label: description” lines and emoji that often come from text copied out of a chat window.
Sentence-by-sentence highlights
Marks the sentences with the strongest AI writing signals and explains each one, so you can see why the score is what it is.
How accurate are AI detectors?
Every AI checker, free or paid, makes mistakes. Knowing where they go wrong helps you use the result well.
AI detectors look for patterns, and both people and AI models can write in the same way. Text straight out of ChatGPT, Gemini or Claude usually shows many AI writing patterns at once, which is why unedited AI content tends to score high. Once AI text is edited, paraphrased or prompted to sound casual, those patterns fade and any detector becomes less certain.
The opposite error matters just as much. Careful, formal writing, such as academic papers, news reports, legal text and essays by non-native English speakers, can share traits with AI output. Textgrain counts formal style as one signal rather than several, and gives real names, numbers and dates credit as signs of human writing, to keep these false positives down.
How to read your result
- Likely human-written: few AI patterns. It does not prove a person wrote it.
- Mixed signals: the text could go either way. This is common for edited AI text and formal human writing.
- Likely AI-generated: many AI patterns agree. Review the highlighted sentences before drawing any conclusion.
Never use an AI detection score as the only evidence in a decision about grades, jobs or publication. Look at drafts, version history and other writing by the same person as well.
Who uses an AI text checker
Anyone who needs to know whether writing was produced by a person or an AI tool.
Teachers and educators
Check essays and assignments for AI writing patterns before talking with a student about their work.
Students
Run a self-check on your own essay so formal writing does not get mistaken for AI text.
Editors and publishers
Screen freelance articles and guest posts for unedited AI content before publishing.
SEO and content teams
Review blog posts and product pages for generic AI writing that adds little value for readers.
Hiring and HR
Look over cover letters and written responses, keeping in mind that a score is never proof.
Writers
See which of your own sentences read as robotic and rewrite them in your own voice.
A free, private alternative to paid AI detectors
How Textgrain compares with typical online AI detection services.
| Compared on | Textgrain | Typical AI detector |
|---|---|---|
| Price | Free, unlimited checks | Free tier with limits, or paid plan |
| Account needed | No | Often required |
| Where your text goes | Stays on your device | Uploaded to the vendor’s servers |
| Explains the result | Every signal and sentence explained | Usually a single percentage |
| How it works | Transparent statistics and rules | Hidden AI model |
| Minimum length | 250 words | Varies |
| Languages | English | Often several |
More free online tools
Other browser-based tools from Entertainment Couch. No sign up for any of them.
Frequently asked questions
Is the Textgrain AI detector free?
Yes. The AI content detector is completely free, with no sign up, no daily limit on checks and no paid tier.
Can it detect ChatGPT, Gemini and Claude?
It checks for writing patterns that are common in text from ChatGPT, Gemini, Claude, Copilot and other AI writing tools, such as overused words, stock phrases, uniform sentence rhythm, vague hedging and template-style headings. It does not identify which model wrote a text.
How accurate is this AI checker?
No AI detector is 100% accurate, including paid ones. Textgrain reports how strongly a text matches common AI writing patterns, not proof of authorship. Unedited AI text usually scores high, but edited or paraphrased AI text can score lower, and very formal human writing can score higher. Use the result as a reason to look closer, never as the only evidence.
Why do I need at least 250 words?
Writing patterns only become measurable over a longer sample. Short texts do not contain enough sentences to judge rhythm, vocabulary or structure reliably, so the checker requires a minimum of 250 words. Results become more reliable above 400 words.
Is my text uploaded or stored?
No. The text is analysed entirely inside your web browser. It is not sent to a server, saved or used to train anything.
Does Textgrain use AI to detect AI?
No. It uses transparent statistics and fixed rules, so every result can be explained. Each signal shows what was measured and which words or sentences triggered it.
Can human writing be flagged as AI-generated?
Yes, this is called a false positive. Formal, academic, technical and non-native English writing shares some traits with AI text. The tool is tuned to avoid this, but a high score alone should never be treated as proof that someone used AI.
Can AI-generated text pass the detector?
Sometimes. AI text that has been heavily edited, paraphrased or prompted to sound casual can avoid many patterns. This is true of every AI detection tool.
Which languages does it support?
The AI text checker is designed for English. Results for other languages are not reliable.
Should teachers use it to prove a student cheated?
No. An AI detection score is not evidence on its own. Use it to start a conversation, and look at drafts, version history and the student's other work before drawing any conclusion.