I Think My Freelancer Used ChatGPT — Here's How to Actually Check

You hired a freelancer. They promised original, human-written blog posts. Three days later, a polished 1,500-word article lands in your inbox — and something feels off. Every sentence is smooth. Almost too smooth. No typos, no personality, no quirky phrasing. Your gut says: did they just paste this out of ChatGPT and hit send?

You're not paranoid. And you're definitely not alone. Here's how to actually find out.

What Does "AI-Generated" Actually Mean?

Think of AI writing like a very talented parrot. Tools like ChatGPT have read billions of web pages and learned which words tend to follow which other words. When you ask it to write something, it predicts the most statistically likely sentences — one word at a time.

The result? Text that sounds professional, polished, and weirdly uniform. AI doesn't get tired. It doesn't start a sentence three ways before settling on one. It doesn't accidentally repeat itself. It just generates clean, confident prose — which is exactly what makes it detectable.

What Are the Signs Something Was Written by AI?

Before you run any tool, here's what to look for with your own eyes:

• Every sentence is a similar length. Humans naturally write in bursts — short punchy lines followed by longer, rambling ones. AI flattens this out.
• The text feels "safe." No strong opinions, no humor, no edge. It could apply to anyone, anywhere.
• Overuse of filler phrases. "In today's fast-paced world," "It's worth noting that," "One key aspect is..." — AI loves these.
• No specific examples or personal details. Generic observations with nothing that could only come from lived experience.
• Suspiciously perfect grammar. Real writers make small, consistent mistakes that reflect their voice. AI doesn't.

Spotting these patterns is a start. But your gut feeling isn't proof. For actual evidence, you need a tool.

How Do AI Detectors Actually Work?

AI detectors are trained to spot patterns that AI writing leaves behind — things the human eye misses but algorithms catch. They look at how predictable each word is, how varied the sentence structures are, and whether the text reads like it came from a statistical model rather than a thinking person.

If you want to understand the mechanics, our explainer on how AI detectors work goes much deeper. The short version: they're not magic. They're probability calculators. And when used correctly, they're genuinely useful.

How to Check If Something Is AI — Step by Step

This takes about two minutes and costs nothing.

• Copy the text you want to check.
• Go to WriteMask's free AI detector.
• Paste the text in and run the scan.
• Read the score and breakdown.

You'll get a percentage indicating how likely the text is to be AI-generated. Above 80% is a strong signal. Below 30% usually means human. The middle zone — 30% to 70% — is trickier and worth a closer look at the specific sentences flagged.

One thing worth knowing: some writers use AI to draft and then edit heavily afterward. A heavily revised draft might score lower. That's not the writer cheating the detector — that's the detector working correctly, because the more a human rewrites, the more human it becomes.

What If the Detector Flags It as AI?

Don't accuse anyone yet. AI detectors aren't 100% accurate — they can produce false positives, especially with very formal, technical, or heavily structured writing. A legal brief or a scientific abstract might score high even if a human wrote every word.

What you can do instead:

• Run the same text through two or three different detectors and compare results.
• Ask your freelancer for their draft history, research notes, or outline.
• Cross-reference the specific flagged phrases with the red flags listed above — context matters as much as the score.

What If You're the One Being Checked?

Sometimes the situation is reversed. Maybe you used AI to draft something, edited it heavily, and now you're worried a client or employer will flag it anyway. That's a real problem, and it happens constantly.

WriteMask rewrites AI-generated content so it reads with the natural variation and unpredictability that detectors are trained to look for — and it passes the major detectors 93% of the time. It's not a magic eraser. It's an editing layer that adds the human texture the original draft was missing.

Not sure where your content currently stands? The AI detection risk quiz gives you a quick read on your risk level before you run anything through a tool.

Whether you're checking someone else's work or protecting your own, the process is the same: understand what detectors are actually measuring, use a reliable tool to get a score, and don't treat a single number as the final word. AI detection is a signal — not a verdict.