How do I check if a document is AI generated?

The most reliable way to check whether a document was written by AI is to run it through an AI Detector. These tools analyze patterns in the text (like phrasing, predictability, and structure) to determine whether the content is more likely to have been written by a human or generated by AI. For the most reliable results, analyze longer passages of text rather than a single sentence, since AI detectors need enough language patterns to evaluate.

You can also review the document yourself for common signs of AI writing. AI-generated text often relies on predictable sentence structures, repetitive word choices, and a neutral or overly generic tone. While these clues can be helpful, they’re not always definitive on their own. Because no detection method is perfectly accurate, it’s best to combine automated tools with manual review.

Some tools provide additional insights. For example, Quillbot’s AI Content Detector provides a detailed analysis that distinguishes between AI-generated and AI-refined text, giving you clearer insight into how a document was likely produced. This makes it easier to evaluate the originality of content and determine whether AI tools played a role in its creation.

Related article: How Do AI Detectors Work? | Techniques & Accuracy

AI detectors are tools designed to estimate whether a piece of text was written by a human or generated by artificial intelligence. They analyze patterns such as predictability, sentence structure, repetition, and word probability to identify signals commonly associated with AI-generated writing. As AI writing tools become more common in education, marketing, publishing, and business, […]

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AI writing tools: Other interesting questions

Is ChatGPT safe to use for school?: ChatGPT is safe to use for school when students follow these precautions:

Stay informed about potential risks such as ChatGPT plagiarism.

Review and follow your instructor and/or school’s policies about generative AI (e.g., Some schools require students to disclose when they’ve used ChatGPT for assignment help).

Avoid sensitive personal information in prompts (e.g., your name and contact information).

Verify facts provided by ChatGPT with credible sources.

Use ChatGPT for small pieces of an essay (e.g., a hook or thesis statement) or to brainstorm ideas. Don’t prompt ChatGPT to generate entire drafts.

Revise any content that ChatGPT generates to ensure the writing assignments you submit are in your own writing voice.

Another way to use ChatGPT safely is by using Quillbot’s free AI Content Detector or AI Detector Mobile App for iOS to ensure that AI-assisted writing hasn’t been plagiarized.
When was ChatGPT released?: ChatGPT was first released on November 30, 2022.

Since then, various updated versions have been released, like ChatGPT-4 on March 14, 2023 and ChatGPT-4.5 on February 27, 2025.

OpenAI, the company that created ChatGPT, is working on new versions for future release.
Can AI write a book?: Yes, AI can write a book. However, a book written by AI probably wouldn’t be a very good book.

Unlike humans, AI is limited when it comes to creativity (e.g., with figurative language), themes, and tone of voice.

Despite this, generative AI can be helpful to human authors. For example, AI can suggest writing strategies to put writers in the right mindset. It can also be used for parts of the writing process. For example, if you’re brainstorming ideas for your own book, the Quillbot AI book title generator can instantly suggest creative, attention-grabbing titles to spark inspiration.

If you use it more extensively, generative AI can be used in combination with a tool that can humanize AI text to improve the style. However, it’s good to be aware that many publishers also use AI detectors to check that what they publish is high-quality, human-written work.

If you’d like to see how AI detectors work, you can try the Quillbot AI Detector.
How to avoid AI detection in academic writing?: The responsible way to avoid AI detection in academic writing is to ensure the work reflects genuine understanding and original thought. AI-generated essays often sound overly polished, repetitive, or generic.

Students can make their writing more authentic by:

Adding course-specific insights

Including personal analysis or interpretation

Using varied sentence structures

Revising AI-assisted drafts carefully

Citing sources properly

Educational institutions increasingly encourage responsible AI use rather than complete avoidance, making transparency and originality more important than simply lowering a detection score.
Can you use AI to rewrite text?: Using AI to rewrite text can be a quick and easy way to improve clarity, tone, or structure, depending on what you need. You can then use a humanizer tool, like Quillbot’s, to humanize AI text so it reads more like something a person would actually write.

If you’re unsure whether the final version still feels too “AI-generated,” Quillbot’s AI Detector can also help you check the text before you share it.