How to detect written text with AI? Discover 4 tools

With the advancement of artificial intelligence, distinguishing a text written with AI Using human-created content has become a real challenge. However, with the right tools, this task can be much simpler. In this article, we present four solutions that help you accurately detect and analyze it. Check it out:

Is AI-generated text considered plagiarism?

Many people wonder whether AI-generated text can be considered plagiarism, especially in fields like education, journalism, and professional work. The answer depends on the use of the generated content. By default, AI-generated texts, such as ChatGPT, are not automatically considered plagiarism, as they are produced by algorithms that combine and transform information based on training data, and do not directly copy excerpts from protected worksHowever, improper or unreferenced use of content may constitute plagiarism in certain circumstances.

According to Brazilian Copyright Law (Law No. 9.610/98), plagiarism is the complete or partial copying of a protected intellectual work without due authorization or credit to the author. Since AI is not considered an author in the legal sense, since it does not hold copyright, the problem is not with the text itself, but in those who use it as if it were their own creation. If someone submits AI-generated content as an original production in an academic paper, for example, without disclosing its origin, this may be considered plagiarism by omission of authorship.

In addition, several educational institutions, publishers and government agencies have adopted internal rules and specific policies on the use of AI. Brazilian universities, such as USP e Unicamp, have debated the inclusion of clauses in their academic codes of ethics that require the explicit statement of the use of generative AI, especially in dissertations, theses and scientific articles. Internationally, scientific journals such as Nature and Science They also prohibit AI from being listed as an author and require transparency about its use.

In the legal environment, there is still a gray zone, because intellectual property laws were created to protect human creations, not algorithms. The U.S. Copyright Office (US Copyright Office) has already stated, for example, that works created entirely by AI are not protected by copyright, which raises questions about responsibility and authorship. In Brazil, the Legal Framework for Artificial Intelligence (PL 2.338 / 2023), still in progress, establishes ethical principles and responsibilities for the use of technology, but does not directly regulate the issue of plagiarism by AI.

Best AI Text Detectors (and How to Use Them)

With the advancement of generative artificial intelligence tools, platforms specializing in identifying when a text was created with the help of AI have also emerged. These technologies have become important allies, helping to preserve originality and transparency in content production. Below, we present the best AI-generated text detectors and we explain how to use them:

Monica

O Monica is an artificial intelligence-based browser extension that offers multiple functionalities, such as generating texts, summaries e automatic responses. Its difference, however, is in the tool of AI-generated content detection, specially trained to identify patterns from ChatGPT and other OpenAI models. In addition to textual analysis, Monica also performs comparisons with available sources on the internet, which helps identify possible plagiarism combined with AI. It's a practical solution for those who want to perform a quick check directly in the browser, with a user-friendly interface and integration with platforms such as gmail e Google Docs.

Here's how to use the extension:

Step 1: go to Chrome Web Store and install the extension Monica AI in your browser (Chrome, Edge or Brave).

Step 2: then create a free account or sign in with your Google account.

Step 3: access a website with a text field (such as Google Docs, email, or forms).

Step 4: click on the Monica icon that will appear in the bottom right corner of your screen.

Step 5: select the option “AI Detector” in the side menu.

Step 6: Paste the text you want to analyze and click “Check AI”. The extension will indicate the likelihood that the text was generated by artificial intelligence.

originality.ai

Aimed at professional and academic audiences, the originality.ai is one of the most reliable and popular detectors today. Developed specifically for content editors, copywriters, and SEO managers, it analyzes texts in depth to detect the likelihood of AI authorship, particularly models like GPT-3, GPT-4, and Bard. A key differentiator is its team scanning functionality, ideal for companies with multiple copywriters, and its statistical accuracy, which provides a clear percentage of suspected AI authorship. It also includes integrated plagiarism checking, making it a comprehensive tool for editorial quality control.

Follow the steps to use the tool:

Step 1: visit the site originality.ai.

Step 2: then click “sign up” and create an account.

Step 3: in the main panel you can view all available options.

Step 4: paste the text you want to check or enter the URL of a page.

Step 5: select verification options: “AI Verification"and "Plagiarism check".

Step 6: click "Scanning" and wait for processing. The tool will generate the result as a percentage of likely AI generation and, if selected, the plagiarism rate detected.

Undetectable.ai

O Undetectable.ai is a versatile tool that works both in detection of texts generated by artificial intelligence and rephrasing these contents to make them more "humanized." It accurately identifies whether a text was written by models like ChatGPT, GPT-4, or Claude, making it useful for teachers, editors, and recruiters who want to assess the authenticity of a text. Furthermore, it offers an additional feature: the ability to rewrite AI-generated texts with changes in style and structure, aiming to escape automated detection.

Below, see how to identify if content is artificial and, if desired, make it more natural:

Step 1: visit the site undetectable.ai.

Step 2: then scroll down to the text box and paste the content that you want to analyze.

Step 3: click on the option “Check for AI” to start the analysis.

Step 4: see the result indicating the level of artificiality of the text.

Step 5 (optional): If you want to rewrite the text to sound more human, click on "Humanize"Now, wait for the new version of the text and, if you want, copy the result for use.

ZeroGPT

O ZeroGPT is one of the most accessible and popular tools for those who want to check if a text was written by AI, offering a simple and free interface. It stands out for accurately identifying mixed passages—that is, texts partially generated by humans and partially by AI. Its algorithm classifies text with different levels of probability of AI use, visually flagging the most suspicious parts.

Check out how it works:

Step 1: visit the site zerogpt.com.

Step 2: on the home page, paste the text you want to check into the main box.

Step 3: click “Detect text”.

Step 4: Wait a few seconds for the analysis and see the result with the percentage of probability that the text was generated by AI.

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See also:

How to Use ChatGPT Search to Find Products for You

OpenAI and FDA to Use AI in Drug Evaluation

Sources: Zdnet, SurferSEO e PC Mag.

reviewed by Gabriel Princessval in 14 / 07 / 2025