Sitemap
Every page on this site, grouped by what it is for.
Detector and tools
- Is this AI written? Check any text, free.The free AI detector: paste any text, no word limit, no sign-up.
- Invisible character removerFind and remove zero-width spaces, look-alike letters and hidden Unicode characters from any text. Free, no sign-up, runs in your browser.
- An AI detector for essays, with a sentence-by-sentence mapCheck an essay for AI free, with no sign-up or word limit. See which passages read most like AI, what a result can't tell you, and what to do if flagged.
- An AI detector for long documents, up to whole booksCheck a novel, thesis or manuscript for AI in one go: no word limit, a chapter-by-chapter view and a narrative fingerprint for fiction. Free and private.
- ChatGPT detector that also checks Claude, Gemini and DeepSeekFree ChatGPT detector that also checks Claude, Gemini and DeepSeek text. No sign-up, no word limit, and your text never leaves your browser.
- A free AI detector with no sign-upA free AI detector with no sign-up: no email, no login, no credits or daily cap. Paste text, ask “is this AI?” and get the full report.
- A private AI detector you can check for yourselfA private AI detector that runs in your browser: nothing is uploaded, and you can confirm it in DevTools. Plus what other detectors do with your text.
Use cases
Head-to-head comparisons
Alternatives
Best AI detectors, ranked
Guides and questions
Spotting AI
Em dashes don't prove AI wrote it
Spotting AI
How AI fiction differs from human stories
School and work
Wrongly flagged by an AI detector? What to do next
Methodology and company
- How the detector works, and how we test itHow the detector works and how it is tested, with the open benchmark.
- About IsThisAiWrittenWhy IsThisAiWritten exists, how it is built, and what it will and won't claim. A free AI detector with no sign-up that runs in your browser.
- ContactHow to reach IsThisAiWritten: corrections, questions about results, press and partnership requests.
- Cookies and browser storageEvery cookie and browser-storage item IsThisAiWritten uses: what sets it, why, and how long it lasts. The detector itself sets no cookies.
- DisclaimerWhat IsThisAiWritten's results, articles and comparisons can and can't be relied on for, plus how ads and outside links on the site work.
- Editorial policyHow IsThisAiWritten writes comparisons and articles: sourced and dated facts, our own tool disclosed, no paid placements, and how corrections work.
- Luis, founder of IsThisAiWrittenLuis founded IsThisAiWritten, the free AI detector that runs in your browser. Who is behind the site and the articles published on it.
- Terms of useThe terms for using IsThisAiWritten, a free AI detector that runs in your browser. Results are estimates, provided as is.
- Your text never leaves your browserWhat runs where, what gets downloaded and what stays on your device.
Is this AI written? Check it now.
Free, no sign-up, no word limit. The check runs in your browser, so your text never leaves your device.
Check text free