Something Feels Off About This Copy: How to Find Out If Text Is AI Generated

Picture this: you manage content for a growing agency. A freelancer delivers eight articles. They look passable at first glance — decent structure, no obvious errors. But something is off. Every sentence lands at roughly the same length. Every paragraph closes a little too neatly. You run one through a detector almost as a gut-check, and it flags the whole batch as likely AI-generated.

Now you're stuck. Did you just receive thousands of words of lightly edited ChatGPT output? Or is this a false positive on a writer who just happens to write cleanly? Before you send an uncomfortable message, you need to actually understand what you're looking at.

What does AI-generated text actually look like?

AI-generated text tends to be rhythmically uniform: sentences of similar length, paragraphs that open with a topic sentence and close with a summary, and transitions that are grammatically correct but semantically weightless — phrases like "it is worth noting" or "this approach offers several benefits." The prose is coherent, but it's coherent in an oddly frictionless way.

Human writing is messier. It has fragments. Digressions. The occasional sentence that runs on a little longer than it should because the writer was working something out in real time. That variation isn't a flaw — it's the signature of someone actually thinking on the page.

How do AI detectors find AI-generated text?

AI detectors measure statistical patterns in text — specifically, how predictable each word choice is given everything that came before it. Models like GPT consistently select high-probability words. Human writers deviate from the statistically obvious choice far more often, even when they're being careful.

Two signals matter most: perplexity (how surprising the word choices are overall) and burstiness (how much sentence length varies across the piece). Low perplexity combined with low burstiness points strongly toward machine authorship. If you want to go deeper on the mechanics, the how AI detectors work explainer breaks down exactly what these tools are measuring under the hood.

How to actually check if text is AI generated

The fastest starting point is a dedicated detection tool. WriteMask's free AI detector lets you paste in any text and get a probability read without needing an account. Here's how to get the most out of it:

• Check sections separately, not just the full document. AI usage is often uneven — an introduction written by hand, a middle section generated and lightly edited. Running individual paragraphs gives more precise results when the overall score feels borderline.
• Look at which sentences triggered the flag. A good detector highlights specific passages, not just an aggregate score. If the flagged sentences all share the same structural pattern, that's more meaningful than a single headline number.
• Cross-reference with a second tool. No detector is definitive on its own. Two independent tools flagging the same passages is a stronger signal than one tool alone.

It's also worth knowing that detectors can flag human-written text — especially from writers who use formal, structured styles or who write in a second language. Before drawing conclusions, it's worth understanding the real rate of AI detection false positives and who's most likely to be caught by them.

What to do when the result is unclear

A borderline score doesn't give you a verdict. It gives you a question worth asking out loud.

For a freelancer relationship, ask for an earlier draft, a brief outline, or a summary of their research process. Writers who did the work usually have something to show for it. For an academic context — say you're the student whose work got flagged rather than the person doing the reviewing — the guide to proving your essay is human covers what evidence actually holds weight with reviewers and what documentation to pull together.

If the text is genuinely AI-generated and needs to read naturally — say you drafted with AI assistance and want it to pass review — that's where a humanizer matters. WriteMask rewrites AI-generated content to reduce the statistical patterns detectors measure, with a 93% pass rate across major detection tools. It restructures at the sentence level to restore the variation that distinguishes human writing from machine output, rather than just swapping synonyms.

The bottom line on finding AI-generated text

Knowing whether text is AI generated means understanding what detectors actually measure and reading the results with some nuance. Use WriteMask's free AI detector as a starting point, look at the pattern of flagged sentences rather than the aggregate score alone, and treat anything borderline as a prompt for more questions — not a final answer in either direction.