to/human

Free AI Detection Checker — Is Your Text Detectable?

Paste your text below to check if AI detectors will flag it. If it is, humanize it instantly with ToHuman.

100% private — runs in your browser No signup required Instant results

Paste at least 50 characters and 2 sentences for an accurate analysis. Longer text = more accurate score.

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How the checker works

Eight signals — analyzed entirely in your browser

Real AI detectors score text on the same kinds of linguistic patterns this checker measures. Burstiness, vocabulary diversity, transition phrases, and passive-voice usage are the bread and butter of every commercial detector — including the ones used by universities. We don't send your text anywhere; the analysis runs as JavaScript on this page.

Burstiness

Sentence-length variance. Humans burst between short and long; AI is uniform.

Vocabulary richness

Type-token ratio. Low diversity = AI; humans substitute words naturally.

AI-favored words

Counts known LLM tells like 'leverage', 'delve', 'tapestry', 'pivotal'.

Formulaic transitions

'Moreover', 'Furthermore', 'It is important to note' — classic AI starters.

Hedging language

'May', 'might', 'could' — AI hedges far more than human writers do.

Passive voice

AI defaults to passive constructions where humans use active verbs.

Contractions

Humans use them, AI strips them. Low contraction count is a strong signal.

Sentence starters

Repeated first words across sentences — formulaic, machine-like rhythm.

Why AI detectors flag human writing too

AI detectors are pattern-matchers, not lie detectors. They score text on the same linguistic signals this checker uses — and they get it wrong, often. Independent research published in 2026 found false-positive rates of up to 61% for non-native English speakers, and 15–26% for native speakers depending on the tool.

That's why over 25 universities — including MIT, Yale, NYU, UC Berkeley, and Johns Hopkins — have banned or restricted AI detection in undergraduate courses. UCLA refused to adopt Turnitin AI detection at all.

What this means for you: a HIGH score on this checker doesn't mean your text is AI-generated — it means a real detector will probably think it is. That's enough to get a student flagged or a piece of content rejected. The fix is the same either way: humanize the text so the patterns disappear.

Read: AI Detection False Positives in 2026 Read: Universities Banning AI Detection View pricing (free during launch)

Frequently asked questions

Need something else? Email [email protected].

How does this AI detection checker work?
It runs a linguistic heuristic analysis right in your browser — no server call, no signup. The checker measures sentence-length variance (burstiness), vocabulary diversity (CTTR), AI-favored vocabulary frequency, formulaic transition phrases, hedging language, passive-voice ratio, contraction usage, and repetitive sentence starters. These are the same signals real AI detectors like GPTZero and Originality.ai score on. Your text never leaves your device.
Is this AI detection checker accurate?
It's a strong directional indicator. Heuristic checkers like this one catch the same patterns commercial detectors look for, so a HIGH risk score here usually means a HIGH risk score on Turnitin, GPTZero, or Originality.ai. That said, no AI detector — ours or theirs — is perfect. Independent research shows commercial detectors flag human writing as AI up to 61% of the time for ESL students. Use this tool to check your text before submission, then humanize it if it scores high.
Will my text be saved or shared?
No. The entire analysis runs in your browser using JavaScript — your text is never sent to our servers. We don't store it, log it, or share it. Close the tab and it's gone. This is different from server-side AI detectors that upload your content for analysis.
What is a good AI detection score?
Anything below 30% (LOW risk) generally reads as human-written and should pass most detectors. Between 30–60% is MEDIUM risk — some detectors will flag it, others won't, depending on their sensitivity. Above 60% (HIGH risk) means strong AI signals are present and most detectors will flag the text. If your score is HIGH, humanize the text with ToHuman to rewrite the patterns that detectors look for.
How can I make my AI text undetectable?
Run it through an AI humanizer like ToHuman. A humanizer rewrites the text at the sentence-structure level — varying sentence length, breaking up uniform rhythm, swapping AI-favored vocabulary, and adding natural human patterns like contractions. This is more effective than manual rewriting because humanizers are trained specifically on the signals detectors look for. Paste your text into the checker above to see your score, then click 'Humanize this text' to rewrite it. Free during launch, no signup required for the first 700 characters.