Writing
Detect AI-generated text instantly
Paste text and get an AI probability score, human probability, suspicious sections, and rewrite suggestions.
For the best results: Paste the text you want checked. The AI rates the likelihood it was written by AI and explains the patterns that triggered it.
What is AI Detector?
AI Detector is a free AI writing tool that analyzes a block of text and returns an AI-probability score, flagged sections, and rewrite suggestions. Your brief is routed to a model suited to writing work and comes back as polished, original writing drafts tailored to your tone and purpose in seconds. No account stands between you and the draft, and what you write is cleared when you close the tab, not banked.
- ✦Write immediately, with no account standing between you and the draft
- ✦Every request is routed to a model suited to writing work
- ✦Drafts and prompts are cleared when you close the tab
Models: It routes across leading models including Gemini, Llama and Mistral families, picking the best available one per request. The exact model used is shown after every response.
See it in action
A uni tutor wants a second read on an essay that feels oddly smooth before raising anything with the student.
What you type
[Pastes three paragraphs of a first-year sustainability essay that reads very evenly, with no contractions and heavy use of "moreover" and "in conclusion"]
What you get
Overall AI-probability: 78% (likely AI-assisted) Flagged: paragraph 2 — uniform sentence length, "it is important to note that" x2, zero concrete examples. Lower risk: paragraph 3 — a specific anecdote and a misspelling read as human. Suggestion: ask for a short section rewritten by hand on a named case study; genuine detail is hard to fake on the spot.
Tip: Treat the score as a flag, not a verdict — a confident percentage is not evidence. The genuinely useful part is the flagged sections, so read those against what you know of the writer's normal voice rather than acting on the headline number alone.
Use cases
What people use it for
Check a freelancer's submitted article before you pay the invoice, when the tone feels slightly off.
Screen a student or trainee submission for machine-written sections before deciding whether to raise it.
Test your own writing before submitting it somewhere that runs its own AI detection.
Who uses AI Detector?
Commissioning editors
screening submitted drafts before spending time on a piece that was quietly generated
Careful students
checking their own work reads as human before handing it to a tutor who screens for AI
Hiring recruiters
sanity-checking whether a written application was actually authored by the candidate themselves
How it works
- 1Describe what you need written, with tone and audience.
- 2A writing-tuned model drafts it to your brief.
- 3Copy the draft, or ask for a tighter, longer, or different-tone version.
Tips for the best results
- Paste a decent block of text; very short snippets give the score too little to judge.
- Read the flagged passages rather than fixating on the headline percentage.
- Treat the result as a signal, not a verdict, since genuine human writing can read as AI-like.
- Use the highlighted sections to find the flat, patterned sentences and rewrite them in your voice.
- Re-check after editing to see whether your changes actually shifted the assessment.
FAQ
Frequently asked questions
How much should I trust the AI-probability score?
Treat it as a signal, never as proof. No detector, this one included, can be definitive: human writing that's formulaic or heavily edited can score high, and AI text that's been reworked can score low. Use the score to decide where to look closer, and never accuse someone on the number alone.
What do the flagged sections actually show me?
They mark passages carrying patterns common in machine-generated text: uniform sentence rhythm, stock transitions, hedged conclusions, an evenness human writers rarely sustain. Flags are where to concentrate your own reading, not a verdict. A flagged paragraph set beside an author's known writing often settles the question faster than any score.
Does it work on short pieces of text?
The shorter the sample, the weaker every signal, because the patterns detectors rely on need room to show up. A single sentence can't meaningfully be scored. Paste the full passage, or ideally the whole document, and weight the verdict on longer sections more heavily than on fragments.
Can it tell me which AI tool wrote the text?
No. It estimates how likely the text is to be machine-generated at all; attributing it to a particular tool isn't possible with any reliability, and anything claiming to do so is overreaching. Different AI systems produce increasingly similar prose, and light human editing blurs the trail further.
Is the text I paste in kept anywhere afterwards?
Nothing persists once you close the tab: sessions aren't stored and aren't used for training. Processing happens through third-party AI providers under their own terms, which is worth knowing if you're checking unpublished manuscripts or student work. For genuinely sensitive documents, paste the passages in question rather than the whole file.
Is the AI detector free with no sign-up?
Yes. Paste text and get an AI-probability score with flagged sections at no cost and with no account. Run as many checks as you need and nothing is held back behind a paid plan. Copy your text in, read the result, and adjust from there.
Does it work on text in other languages?
It works best on English, where the patterns it looks for are clearest. You can paste other widely used languages, but treat the score with more caution there, since the signals of machine-written text are less reliable outside English. Use it as a guide, not a verdict.
How do I lower my AI detection score?
Rewrite the flat, evenly-paced sentences the tool flags, varying their length and adding specific detail only you would know. Break up predictable structure, cut hedging filler, and let your natural voice show. Re-check afterwards, and remember genuine human writing can still read as AI-like.
What are the usage limits?
Writing tools are unmetered during the current free launch phase, draft, redraft, and polish without counting requests. Only a short per-minute anti-abuse limit applies, which normal writing never touches. Paid plans with higher limits and priority model access are coming soon.
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