Free AI checker
Free AI Checker
Paste your text and analyze AI-writing signals in seconds.
- No sign-up needed
- Sentence-level highlights
- Text never used for training
Minimum 80 words. Your text is analyzed securely and never used for AI training.
Privacy-first
Anonymous scans are never stored. Your text is never used to train AI.
Secure processing
Encrypted in transit, isolated per account, keys never exposed to the browser.
Fast analysis
Results in seconds, with sentence-level scoring for every scan.
Transparent scoring
Likelihoods and confidence levels — never an absolute verdict.
A quick check before you hit publish, submit or send
Centixio's AI checker gives you a fast second opinion on any piece of writing. Paste an essay, blog post, cover letter or email and you'll get an overall AI likelihood, a confidence level, and a highlighted view of the sentences that read most like machine-generated text.
It's built for quick, everyday checks: no account is required for your free daily scan, results arrive in seconds, and nothing you paste is stored when you're not signed in.
How it works
Three steps, a few seconds
- 1
Paste at least 80 words
Copy the text straight from Google Docs, Word, email or a web page. Formatting is ignored.
- 2
Click “Check Text”
The text is analyzed by a dedicated detection model — not a chatbot asked for its opinion.
- 3
Review the highlights
See the overall likelihood, then scan the highlighted sentences to understand where the signal comes from.
Use cases
Who uses it
Before submitting
Check that your own drafting — including text you revised with AI help — reads as your voice.
Freelance deliverables
Spot-check articles and copy you've commissioned before you publish them.
Job applications
Make sure a cover letter sounds personal, not templated.
Limitations you should know
- Short texts under ~150 words carry less signal; results are shown with lower confidence.
- Human writing that is very formal or formulaic can be over-flagged.
- Paraphrased or heavily edited AI text may score lower than its origin suggests.
AI detection systems can produce false positives. Use results as one signal rather than definitive proof, and never as the sole basis for academic, employment or disciplinary decisions.
How we handle your text
- No training. Your text is never used to train AI models — ours or anyone else's.
- Anonymous = not stored. Scans without an account are analyzed and discarded.
- Private history. Signed-in scans are visible only to you, and can be disabled or deleted.
- Never public. Scans and reports are never indexed or shared.
FAQ
Frequently asked questions
Is this AI checker really free?
Yes. You get 1 free check per day of up to 2,500 words, with no credit card. Paid plans add document uploads, history and detailed reports.
Do I need to create an account?
No. Your free daily scan works instantly without an account. A free account keeps your recent results and usage in one place.
What does the percentage mean?
It's the estimated likelihood that the text was AI-generated, based on detection signals. 72% means the text shows strong AI-associated patterns — not that 72% of it was written by AI, and not proof either way.
Is my text saved?
Not when you're signed out — it's analyzed and discarded. Signed-in users can keep a private history and delete it at any time. We never train AI on your text.