Suspect AI-Generated Text? Here's How to Check — And What to Do With the Results

Say you're a content manager. A freelancer returns a 1,200-word blog post in under an hour — polished, passable, weirdly even in rhythm. Something feels off. You don't want to accuse anyone unfairly, but you also don't want AI-generated filler published under your brand name. You need to know before you act.

Or picture a professor three weeks into the semester, reading through a batch of essays. One stands out — not because it's brilliant, but because it reads like no student in the class actually wrote it. The sentences are too smooth. The argument is too tidy. Before escalating, you want more than a gut feeling.

The question is the same in both cases: can you actually check if a text is AI generated? The honest answer is yes — but with real limits you need to understand before you do anything with the results.

How does AI text detection actually work?

AI detectors analyze text for statistical patterns that large language models consistently produce. The two signals they rely on most are perplexity and burstiness. Perplexity measures how predictable each word choice is given the words before it — AI models tend to pick the statistically expected word, keeping perplexity low. Burstiness measures sentence length variation — human writing naturally mixes short punchy sentences with longer, messier ones, while AI output settles into an even, comfortable rhythm and stays there.

When a piece of text is low on both, detectors flag it. For a deeper look at what's happening under the hood, how AI detectors work walks through the statistical logic in plain language.

How to check if a text is AI generated right now

The fastest free option is WriteMask's free AI detector. No account needed. Paste in the text and get a signal about whether it reads as AI-generated, human, or somewhere in between.

A few practical things to know before you run the check:

• Use several paragraphs, not a sentence or two. Short samples give detectors almost nothing to work with. The signal gets more reliable as the text gets longer.
• Run the same text through more than one tool. No single detector is authoritative. If two or three independent tools flag the same passages, that's a much stronger signal than one result alone.
• Look at where the flags cluster. Many detectors highlight specific sentences they find suspicious. Uniform, hedged, impersonal phrasing concentrated in the same sections is more meaningful than scattered isolated flags.
• Consider the writing context. A highly structured, formal document will score differently than a casual narrative — even if both are entirely human-written.

What detector results actually mean — and what they don't

This is where most people go wrong. A detector flag is a probability estimate, not proof. Those statistical patterns can and do appear in human writing — especially writing that is formal, heavily edited, or produced by non-native English speakers trained to write in structured academic styles.

AI detection false positives are well-documented. Technical writers, graduate students whose first language isn't English, and anyone trained in highly systematic prose can trigger the same signals that AI-generated text triggers. A single flag from a single tool is not grounds for an accusation. It is grounds for a conversation, or for looking more carefully at other evidence.

What detectors are genuinely useful for: forming a reasonable hypothesis, deciding whether a deeper look is warranted, and checking your own drafts before submitting them somewhere that uses these tools.

What if the text being checked is yours?

The search that brought you here might not be about checking someone else's work. Maybe you used AI as a drafting tool, edited heavily, and now wonder how a detector would read what you ended up with.

Checking your own text before submission is smart. Paste it into the free AI detector to see where you stand. If sections still pattern as statistically AI-like even after significant editing, WriteMask can help restructure those passages at the sentence level — adjusting the rhythm and phrasing patterns that detectors flag rather than just swapping synonyms. WriteMask achieves a 93% pass rate across major detection tools. For a step-by-step walkthrough of the process, how to humanize ChatGPT for Turnitin covers exactly this scenario.

The honest reality of AI detection in 2026

Detection and generation are evolving at roughly the same pace. No detector catches everything. None flags with certainty. What these tools give you is a signal — useful, but not final.

If you're on the checking side, gather that signal, apply judgment, and resist the pull to treat a percentage as a verdict. If you're on the writing side, knowing how these tools read your work gives you the chance to address it before someone else does. Either way, the check is a starting point — not the end of the conversation.