The June 2026 Observatory audit is being built: 9 detectors planned across 4 writer cohorts. Read the plan here. Figures in this build are illustrative.
NEWSigned evidence reports are live

Humanize AI text without losing your voice.

Rewrite AI drafts so they read like a person wrote them. Detectors also flag plenty of human writing as machine-made. We fix that, too.

Check Your Writing Read the Research
Stanford
HAI · 2023
Grounded in peer-reviewed findings: 61% of TOEFL essays by non-native speakers were falsely flagged as AI across seven detectors (Liang et al.)
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Scoring starts as soon as you type.
Processed locally
61%
of TOEFL essays by non-native English speakers were falsely flagged as AI in Stanford's study. Every one had a human author.
44
tell patterns in the registry. Each one is named, highlighted where it occurs and explained in a sentence, instead of a bare score you cannot act on.
0
detectors your text is ever submitted to. Checking your writing here does not send it to GPTZero, Turnitin or anyone else.
Plain definition

What an AI humanizer actually does

When people say they want to humanize AI text, they mean one of two things: a draft a model wrote that now has to sound like a person, or their own writing, which a detector has already called machine-made. Humanize AI does both jobs.

A registry of 44 tell patterns runs inside your browser, marks every phrase that reads as machine-made, explains each one in a sentence you can argue with, and leaves the rewrite to you. You see the reasoning, not just a number.

What a detector reacts to is not vocabulary. It is rhythm: sentences of near-identical length, three openers in a row built the same way, hedges stacked two deep, transitions that connect nothing. Trading utilize for use moves none of that. Cutting the sentence that was never yours moves all of it.

Two jobs, both done here: make a permitted AI draft read like you wrote it, and show a falsely flagged writer which sentences are doing the damage.

Open the AI humanizer
The false-positive problem

Flagged for writing while different.

Statistical detectors flag whatever deviates from their training data. The writers they flag most deviate for good reasons.

01 · MULTILINGUAL

Writing in a second language

Second-language writers learn the textbook constructions detectors score as machine-made. Correct grammar reads as low perplexity.

For second-language writers
02 · NEURODIVERGENT

Autistic and ADHD writers

Formal register and precise, structured phrasing are common autistic writing styles. To a classifier they look like a language model.

03 · ASSISTIVE TECH

Dyslexia, aphasia, motor impairment

Dictation, word prediction and grammar tools smooth text into even patterns. That evenness is exactly what a detector scores as machine-made.

04 · RECOVERY

After a brain injury

Writers rebuilding language after TBI or stroke tend toward shorter, evenly paced sentences. Low burstiness, high false-positive risk.

Two minutes with Humanize AI

The same paragraph, rewritten.

The same admissions paragraph, before and after. Same story, same writer, zero tells.

grad-school-statement.md

In today's rapidly evolving landscape, research is not just a passion, but a calling. I have honed my skills in analysis, communication, and collaboration. Moreover, my experiences have underscored the importance of leveraging diverse perspectives to foster innovation.

"not X, but Y" pivot"underscores the importance of"AI lexicon: "foster"AI lexicon: "leverage"Stock opener ("evolving landscape")Three-item list ("X, Y, and Z")Idle transition (Moreover, Furthermore)
Detectability score
Humanize AI score
85 / 100 · high risk
Scored in your browser by Humanize AI's own checker. Your text is never sent to a detector.
How it works

Know the risk before anyone else does.

1

Check in your browser

A 44-pattern registry runs in this tab and scores how detectable your text reads. No upload, no account, no queue.

2

Understand the tells

Every trigger is highlighted inline and explained in plain language: tricolons, hedge stacks, dead transitions, uniform rhythm.

3

Revise in your voice

Suggestions stay inside your measured style. The point is writing that sounds like you, because it is you.

4

Prove authorship

Export a signed evidence report with local edit history and drafting cadence, for when a percentage gets used against you.

For teams allowed to use AI

Kill the tells. Keep your voice.

Plenty of employers permit AI drafting. Readers still bounce off machine cadence. Marketers, translators and support teams use Humanize AI to make permitted AI drafts read like a person wrote them.

Flagged humans and flat machine drafts fail the same way: language with nobody home.

"it's not X, it's Y"tricolons, everywhere, alwayshedge stacking ("arguably somewhat")Moreover, / Furthermore, / Additionally,relentless parallel structuredelve · leverage · foster · robustevery sentence the same lengthconclusions that "underscore"three sentences opening the same wayem dashes — at this density — everywhere44 tell patterns, explained and fixed inline

The registry ships 41 surface patterns plus 3 whole-document cadence detectors. Every one runs in your browser.

For researchers and journalists

The Detector Observatory

A continuous public audit of commercial AI detectors, run against cohort-labeled human corpora. Reproducible methodology, downloadable data, citable results. Free for accredited researchers and newsrooms. The write-up of who gets flagged, and how often, lives on AI detector false positives.

Open the ObservatoryDownload Datasets
Figures in this build are illustrative. They show the shape of the audit, not measured detector results, and must not be cited as findings.
Detector · June 2026 runFalse positives · native EN· ESL writers· assistive tech
Detector A1.3%11.7%18.7%
Detector B2.2%19.7%24.1%
Detector C3.8%21.6%30.1%
Preview of 3 of 9 detectors. Full run includes confidence intervals and per-domain splits.
Privacy

Check your work without handing it over.

Detection services keep what you submit to them. The checker here runs in your browser tab instead, and your text is never sent to a detector.

01
The checker runs in your browser
41 surface patterns and 3 document statistics, all in JavaScript. No model, no network call. Load the page once and it works in airplane mode.
02
Never sent to a detector
Your text is never submitted to GPTZero, Turnitin, Copyleaks or any other detection service. Checking your work does not put it in someone else’s corpus.
03
Verifiable without us
The signature format is documented and verification runs in your browser. An institution checks a report against the public key it carries, without contacting us.
Questions people actually ask

Humanize AI: common questions

Is Humanize AI free?

Everything on the site is free right now and needs no account: the score, the tell explanations, the rewrites and the signed evidence export. Nothing is metered. Paid tiers are planned, not live — the pricing page says so and carries a hardship address.

Does the checker upload my text?

No. The checker is JavaScript running in this browser tab, on your machine. There is no upload step, no draft sitting in a queue. Open your network tab, paste a paragraph, and watch nothing leave. Whatever you paste is also never submitted to a detector — not GPTZero, not Turnitin, not any of them.

Will this beat AI detectors?

Detectors are retrained without notice and disagree with each other on the same paragraph, so nobody can guarantee an outcome on a named one. What this tool gives you is specific: the sentences that read as machine-made, the pattern behind each one, and the reason it triggers. Fix those and the text reads like a person wrote it.

What exactly is a "tell"?

A tell is a specific, nameable pattern that shows up far more often in generated text than in human drafts: the "not X, but Y" pivot, three-item lists in every paragraph, "delve into", "it is worth noting that", hedges stacked two deep. The registry ships 41 surface patterns plus 3 whole-document cadence detectors, 44 in total. Each one is highlighted where it occurs and explained in a sentence you can argue with.

Does it work offline?

The checker does. Once the page has loaded, scoring, highlighting and the signed export all run without a network connection. Turn on airplane mode mid-session and they keep working.

What about my institution's AI policy?

Policies differ, so read yours and follow it. Humanize AI is built for two situations: drafts where AI assistance is permitted and the writing needs to read like a person, and human writing that a detector has flagged and that now needs defending. For the second case, export a signed evidence report of your own drafting history.

Your words are yours.
Keep it that way.

Free checker. No account. Never sent to a detector.

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