The Problem
You used ChatGPT to draft an essay, blog post, or cover letter. It reads fine. But you have no idea what score it would get on Turnitin, GPTZero, or Originality.ai — and you're about to hit submit.
Getting flagged by an AI detector after submission means awkward conversations, rejected invoices, or academic integrity meetings. By then it's too late to fix anything.
What GPTZero Online Does
Paste your text and instantly see:
- AI probability score — how likely detectors would flag your writing
- Sentence-level highlights — exactly which lines look most AI-generated
- Signal breakdown — what patterns (predictability, sentence uniformity, formulaic structure) are triggering the score
Who It's For
- Students checking essays before Turnitin flags them
- Freelance writers verifying articles before clients run Originality.ai
- Job applicants making sure cover letters don't sound like ChatGPT templates
- SEO teams confirming content reads as human before publishing
Why Not Just Guess?
We tested 6 AI detectors on 20 writing samples. Key finding: 20% of human-written text gets falsely flagged. You can't tell by reading alone whether your text will pass — the patterns detectors measure (perplexity, burstiness) are invisible to human readers.
Free, Instant, No Signup
Paste → check → fix the flagged sentences → re-check. No account, no credit card, no word limits that matter for a single essay or article.
