Paid for Human Writing and Got AI? Here's Exactly How to Check — And What to Do Next

Picture the scenario: you hired a freelance content writer for your company blog. They deliver ten articles. The work is clean — maybe too clean. Every paragraph flows perfectly. There's no quirky phrasing, no personality, no typos. Something feels off, and you find yourself wondering whether you just paid for AI-generated text dressed up as human work.

This situation comes up more often than most hiring managers or editors will admit. And the question — how do you actually check to see if writing is AI generated — has a concrete, practical answer.

What Does "Checking for AI Writing" Actually Involve?

Running writing through an AI detector compares the text against statistical patterns associated with AI language models — things like predictable sentence structure, unusually low variation in sentence length, and what researchers call low perplexity. Human writing tends to be messier. It surprises. It stumbles. AI writing tends to be smooth in a way that feels almost frictionless.

Several tools do this job. WriteMask's free AI detector is one accessible option. Others exist across the market. Most return a probability — "likely AI generated" rather than a firm verdict. That distinction matters, and we'll come back to it.

Before treating any result as definitive, it helps to understand how AI detectors work under the hood. They're measuring statistical likelihood, not catching anyone red-handed — which changes how you should interpret results.

What Patterns Actually Get Flagged?

When you check to see if writing is AI generated and the detector comes back positive, the text usually shares certain characteristics. Not all of them. But several in combination.

• Sentences that run at roughly the same length throughout — no short punchy lines, no long winding ones
• Transitions that feel smooth but generic: "additionally," "this means that," "it is important to note"
• Examples that are oddly vague — "for instance, a company might..." rather than anything specific
• Technically accurate but somehow hollow, like reading a Wikipedia summary instead of someone who's lived the topic
• No errors, no voice, no opinion

A single one of these is meaningless. A piece that checks every box is worth a closer look.

The Step People Skip: Running Two Checks

Here's where a lot of buyers make a mistake. They run one check, see a "likely AI" flag, and immediately send a tense message to their writer. That's a problem — because AI detection false positives are a genuine issue.

Highly technical writing, content by non-native English speakers, and certain formal registers can all trigger detectors even when zero AI was used. Before raising anything with a contractor, run the text through at least two different detectors. If both flag it, the signal is stronger. If only one does, you're in less certain territory.

Also compare the flagged piece against previous samples from the same writer. Does the voice match? Does the vocabulary feel consistent? Sometimes AI-generated content is stylistically jarring against a person's established writing pattern. Sometimes it isn't. Context matters.

Checking Your Own Writing Before Someone Else Does

The reverse situation is just as real. Say you're a content writer who used AI as a drafting tool and rewrote heavily. Or a marketing manager who ran a rough brief through an LLM to produce a first draft before editing it. You've put real work into the final version — but you're not sure whether it'll still read as AI to a detector.

Running a pre-submission check on your own work is a reasonable precaution. If sections come back flagged, WriteMask can help rework those passages while keeping your meaning intact. The platform targets the specific phrasing patterns that detectors key in on and carries a 93% pass rate across major detection tools.

What to Do If the Writing Flags as AI

If you're a buyer and you've run two checks with consistent results, you have a legitimate basis for a conversation — not an accusation. Start there. Ask the writer to share their research notes, draft versions, or source material. A writer who genuinely produced the work will usually have these. One who didn't may struggle to provide them.

If you're a writer who's been flagged for content you actually wrote, the guidance on proving your writing is human applies here too — show your process, your sources, your revision history. The process trail is often more convincing than any rewrite.

The Short Answer

To check if writing is AI generated: paste it into an AI detection tool, read the probability score carefully, and run it through a second tool before drawing conclusions. Look for statistical uniformity in sentence rhythm and phrasing. Treat the result as a signal that warrants investigation — not as a verdict on its own. And if you're the one whose work is being checked, having your drafts and research on hand is the most credible defense.