AI Scanner: Don’t let AI content sneak past you

Whenever we roll out a new version of AI Scanner, we run a benchmark test to ensure it’s 99% accurate in identifying AI-generated, mixed, and human-written content.

That said, like any other checker, our tool has its blind spots. For one, it may struggle with correctly analyzing short texts (under 300 words). So, avoid scanning such short snippets.

Absolutely not. After you get your report, AI Scanner doesn’t store the text you entered any longer. Our tool only holds on to it long enough to analyze it and return an AI score and sentence report. Your data travels to our servers safely thanks to 256-bit encryption. The same level of encryption protects the data on our servers while it’s getting processed, just in case.

No. It’s impossible to guarantee a 100% accuracy rate when it comes to AI detection, and we advise you to steer clear of any tool that does so. Any AI checker can sometimes mistake human writing for AI (that’s known as a false positive). The opposite is also a possibility: a false negative means AI content went unnoticed because it was heavily edited to bypass detection.

That said, not all tools are as accurate as they could be. Some have high false positive rates; others struggle with false negatives. We built and tested AIScanner.io to minimize both, and we keep testing it for edge cases like texts written by ESL authors.

Yes! Unlike many other AI checkers all too happy to hide their full features behind a paywall, AI Scanner is 100% free. You can use it as many times a day as you want; no limits apply. Plus, you don’t even have to create an account, which makes it a much safer option from a data privacy standpoint.

Put simply, the score reflects the share of the text likely generated by AI, whether it was edited later on or not. Our tool detects AI on a sentence-by-sentence basis and highlights the sentences likely generated by AI tools. It also highlights the likely AI output that was edited by a human afterward.

When reviewing the score, remember that false positives are a possibility.

Unfortunately, yes. Even though we’ve tested and fine-tuned AI Scanner to prevent those false positives, in rare cases, it might still mistake human writing for AI content. That’s true for any AI detection tool.

Why? Well, some human-written texts follow established formulas. For example, research papers in certain disciplines have little wiggle room for creativity. Or, you may favor the rule of three in your assignments, but AI tools also do. They were trained on human-written texts, after all.

Absolutely. AI Scanner can catch text generated by the latest ChatGPT model, as well as its predecessors. Even if the author used a humanizer tool or edited the text manually, our checker will still catch the telltale signs of AI involvement (writing patterns, repetitive word choices, etc.).

No. You can check as many texts as needed with our AI writing detection tool. We do limit every scan to 3,000 words so that our tool runs smoothly and returns results fast, however. If your text is longer than that, you can always divide it into several parts and run scans on each of them. (Just strive to make them roughly similar in size.)

What’s more, we don’t require you to create an account, no matter how many scans you’ve run so far. Whether you need to check a text once or run a dozen scans, you can do it without jumping through registration hoops.

AIScanner.io detects output from multiple LLMs, including ChatGPT, Claude, Gemini, Grok, DeepSeek, and Llama, as well as their predecessors.

It doesn’t matter whether AI-generated sentences are peppered throughout human-written text, edited manually to hide AI involvement, or humanized using dedicated tools. Our detector will catch that AI content anyway, highlighting it in the text for you to see. That said, it won’t tell you which AI model was likely used to generate the passage.

Keep in mind that many of the available AI writing assistants are built on the foundation of existing LLMs. So, even if you’re not explicitly told you’re using a GPT-powered tool, its output will still get flagged as AI.

AIScanner.io does its magic by evaluating the text’s predictability.

Put simply, AI-generated text is more predictable than human writing, with repetitive word choices, similar syntax, and generic claims that lack specifics. It may also be inconsistent in its tone and style or plain incoherent.

Human writing, in turn, is more random and diverse. It also tends to be infused with research-backed arguments or real-world examples.

But what about humanized text, you might wonder? Well, even if you manually edit AI-generated text, you can’t get rid of all the telltale signs of AI content. You may switch out words for synonyms now and then, but the paragraph structure may remain the same. Humanizer tools, in turn, also follow predictable patterns, which means their use can be detected, as well.

When our tool scans your text, it essentially analyzes how random it is. Based on that analysis, it returns an AI score. That score shows the share of the text that’s likely been generated with AI.

That depends on the school. Most colleges and universities in the U.S. use Turnitin, which has AI scan capabilities, but many disabled those AI scans due to their subpar accuracy. Still, they leave some wiggle room for educators: if they suspect AI use that clashes with academic integrity policies, they may check it for AI content. In such cases, they’re typically free to choose any AI scanner for teachers they wish.

The same rings true for middle and high school. Teachers are usually free to choose when to run an AI scan and which tool to use to that end.

If you want to know which tools your teachers may use, check guidance from the school you’re attending.

Any accurate free AI detector analyzes the text you provide for randomness in sentence length, paragraph structure, vocabulary, and content itself. Generic, monotonous content with predictable syntax and vocabulary is more likely to come from AI tools.

On top of that, certain words and phrases are a “favorite” among AI tools. That is, those tools keep using them. These “staple” words are usually more sophisticated than their counterparts you’d likely use in everyday speech. Think words like “enhance,” “robust,” “delve,” or “tapestry.”

AI tools are more likely to use clichés, too, especially in introductions and conclusions. For example, they’d start an essay with something like, “In today’s fast-paced world…”

That depends on your needs. Do you absolutely need a free AI checker? What about the word or character limit? Or file upload?

If you’re looking for a free AI checker with a generous limit and text document upload, you’ve found AI Scanner! At the risk of sounding biased, we believe that it has all the potential to become your favorite checker. Apart from being free and quick, it’s also user-friendly and as accurate as it can be.

We monitor our tool all the time to make sure it clears our 99% accuracy benchmark, even when facing heavily edited AI content. So, don’t worry: you can rely on our tool’s score and improve your texts thanks to a sentence-by-sentence report!

No, it’s an either-or type of situation: a tool can either identify AI content or plagiarism, but not both. (When you see a page advertising an AI + plagiarism detector, that’s just two tools in one interface.)

The thing is, an AI writing detector scans texts for signs of AI-generated content. A plagiarism checker, in turn, compares a text to other sources to determine how original it is.