AI Text Detector
Check if text was written by AI
🔒 100% free · no signup · files never leave your device
Since ChatGPT made machine-written text ubiquitous, educators, editors and publishers have needed a quick signal about whether a document came from a person. AI text detectors work on statistical cues: language models pick high-probability words, which produces unnaturally uniform sentence lengths, low lexical variety, repetitive transitions and a kind of polished blandness that human writing rarely sustains. These heuristics are genuinely informative — but no detector is infallible, and false positives are a real risk, especially with non-native writers whose prose can be formulaic.
This free AI content detector analyzes text locally in your browser using perplexity-style statistical signals: repetition patterns, sentence-length variance, phrase predictability and vocabulary distribution. It returns a score with a signal-by-signal breakdown so you can see *why* a passage looks machine-generated rather than trusting a bare percentage. Paste at least 100 words for a meaningful reading. Treat the result as one indicator among several — useful for triage, never as standalone proof of misconduct.
Why use AI Text Detector
Screening student submissions
Teachers can triage a pile of essays to see which deserve a conversation — paired with drafts and writing history, not as sole evidence.
Vetting freelance and guest content
Editors check whether paid submissions are genuinely human-written before publishing under their brand.
Auditing your own AI-assisted drafts
Writers who use AI for outlines check the final text to confirm their editing left a human fingerprint.
Quality control on content pipelines
SEO teams spot-check bulk content for the uniformity patterns that search engines increasingly discount.
Pro tips
- Use at least 100–150 words; short excerpts don't give statistical methods enough material and swing wildly.
- A high score is a prompt to look closer, not a verdict — formulaic human writing (legal text, technical reports) often trips detectors.
- Check the signal breakdown: uniformly medium-length sentences plus repeated connectors ('moreover', 'in conclusion') are stronger evidence than the score alone.
- Compare against a known-human sample from the same author; deviation from someone's normal style is the most reliable signal of all.
How to use AI Text Detector
- 1Paste at least 50 words of text
- 2Click Analyze
- 3Review the score and signal breakdown
Frequently Asked Questions
How accurate is it?▾
It uses statistical signals (perplexity-style heuristics) — a helpful indicator, but no detector is 100% accurate. Use it as one signal, not proof.
Is my text sent anywhere?▾
No — analysis runs entirely in your browser.
What text length works best?▾
At least 100 words. Longer texts give more reliable scores.