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GPTZero
GPTZero
AI Content Writer
GPTZero
GPTZero
AI Content Writer
GPTZero
Identify whether the text was written by a person or AI
  • Starts from $14 / month
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GPTZero Review
  • Last Updated: September 19, 2025

What is GPTZero

GPTZero is an internet tool that checks whether something was written by a person or a computer program like ChatGPT. It looks at word and sentence patterns to determine how predictable the words are and how different the sentences are. A student named Edward Tian created this tool for teachers, editors, and anyone who wants to confirm whether a piece of writing is original. GPTZero shows results with colors and percentages so you can see which parts are likely to be computer-written. It has browser extensions, a way for apps to use it, and additional tools like Canvas and add-ons for Microsoft Word.

Features of GPTZero

If you want to catch AI-written text fast and see clear, easy-to-read signals, GPTZero packs some neat features worth checking out. Read these closely to know what it can actually do.

  1. Perplexity and burstiness scores: It checks how predictable the words are and how different the sentences sound. This helps show parts that might be written by a computer.
  2. Percentage readouts and color highlights: It shows simple percent numbers and colors parts of the text so you can see which lines look like a person wrote them and which look like a computer wrote them.
  3. Human Writing Report: It makes a clear report that explains which parts seem written by a person and why, which can help students prove their work is theirs.
  4. Chrome extension and Word add-on: You can check text right in your web browser or inside Microsoft Word without copying and pasting.
  5. Canvas integration and API: Teachers can use it inside Canvas, and app makers can add it to their programs so the tool runs automatically.
  6. Plagiarism checker: It also looks for copied text from other places to help spot cheating or copying.
  7. Free tier plus paid plans: You can try it for free for small checks, or pay for plans that let you check more words and use more features.

Pros of GPTZero

Do you want a tool that finds AI writing fast and shows simple, clear results? GPTZero can save you time and help you feel sure about who wrote a text.

  1. Fast checks for AI writing: It looks at text fast, so you can see if something might be written by a computer in just a few seconds. This is great when you have lots of papers to check.
  2. Easy-to-see results: It uses percent numbers and colors to show which sentences might be AI-made. The pictures make it simple to explain the results to others.
  3. Helps teachers: Teachers can spot parts of essays that look suspicious and ask students about them. It makes grading quicker when you need to check many papers.
  4. Helps editors and publishers: Editors can do a quick first check on submissions to see if AI was used. It saves time before they do a deeper edit.
  5. Works where you write: There is a Chrome extension, a Word add-on, and Canvas support so you can check text without copying and pasting. That makes checking faster and easier.
  6. Good for apps: Developers can use the API to add the check into their own websites or apps. This helps large sites check lots of text automatically.
  7. Human Writing Report: It makes a clear report that shows why parts look human or AI-written. People can use this report if they need to explain or prove who wrote the work.

Cons of GPTZero

While GPTZero helps spot AI-written text, it has limits you should know about so you don’t rely on it alone.

  • Accuracy problems: GPTZero sometimes misses parts written by a computer and sometimes says human writing was made by a computer. So its results are clues, not proof.
  • Wrong flags hurt people: If a real student or writer is marked as using AI by mistake, it can cause worry and unfair trouble. Always check the text yourself before acting.
  • Hard-to-understand scores: The ideas called perplexity and burstiness are not easy to explain, so many people get confused about what the numbers mean. This makes the results harder to use.
  • Limits with language and updates: GPTZero works best in English and may not catch newer kinds of AI writing. That means it can miss or wrongly judge some texts.

Is GPTZero Right for You?

GPTZero can help you check if writing might be from a computer, but it isn’t always right. Use it for a quick look, and always double-check important work by reading it yourself or asking someone else.

  1. Teachers and schools: It can quickly mark parts of student essays that look like a computer wrote them, so teachers know where to ask questions. Don’t make big punishments just from the tool’s result.
  2. Editors and publishers: Editors can use it to do a fast check of many articles and find the ones that need a closer look. Always do a real edit and plagiarism check before publishing.
  3. Small teams and freelancers: You can test your drafts fast to see if they look original before sending them to clients. It helps save time, but still proofread and check facts yourself.
  4. Developers and platform owners: The tool has an API so apps can check lots of user posts automatically and flag suspicious ones for people to review. Don’t use it to ban things without a human checking first.
  5. Students who want to prove their work: The Human Writing Report can help show parts of your writing are human-made, which might help explain your work to a teacher. Keep your drafts and notes too, just in case.

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FAQ

GPTZero is a website tool that checks if writing was made by a human or by an AI. A student named Edward Tian built it to help teachers, editors, and others check if a text is real.

GPTZero’s accuracy changes with different tests and texts. In real use it’s about 80% accurate in 2025, so its results are clues, not final proof.

It looks at things called perplexity and burstiness. That means it checks how predictable the words are and how much the sentence styles change to guess if a computer wrote it.

Yes. There is a free plan that lets you try short checks so you can see how the tool works before paying.

GPTZero has monthly plans with different word limits. There are entry plans around $15–$24 per month and higher plans near $35–$46 per month. Paying yearly usually gives a discount.

Yes. GPTZero works with Canvas for schools and has an add-on for Microsoft Word. There is also a Chrome extension to check text on the web.

The Human Writing Report is a simple report that shows which parts of a text look written by a person and explains why. Students can use it to help prove their work.

Treat the result as a prompt for further review. Talk to the student, ask for drafts or notes, and perform a manual check before making academic decisions.