9 Best AI Detector Tool You Can Use for Free

Are you searching for free AI detector tools? This article is here to help.

As AI writing tools are used more often, it’s hard to know if the text was written by a person or a computer.

AI checker tools help you see if your writing is real or copied. Students, teachers, writers, and businesses use these tools.

This guide looks at the best 9 free AI detectors for 2025 to help you choose.

Why use a Free AI Detector?

AI tools create text quickly, so it’s crucial to check if the content is human-made or machine-generated.

Free AI detectors help students stay honest with their work, and businesses keep their content original.

They’re a simple, no-cost way to verify authenticity for anyone using digital content.

List of the 9 Best AI Detector Tools

Here’s a list of the top 9 free AI content detectors you can use right now:

1. Detecting-AI

Detecting-AI.com is a website offering a content analysis tool designed to identify AI-generated text in documents.

It uses advanced algorithms to analyze text at the paragraph and sentence level, determining the percentage of AI-generated content.

The tool highlights AI-generated sections in different colors for easy identification and provides detailed reports, including per-sentence AI content percentages and an overall summary.

It aims to help users, such as students, educators, and content creators, ensure compliance with academic guidelines, verify source authenticity, and detect content from AI tools like ChatGPT.

The platform claims a 98% accuracy rate, based on analyzing over 1 billion articles and texts, and emphasizes user privacy by not saving, sharing, or using input text for training.

2. Originality.ai

Originality.ai is a tool on the internet that helps you check if writing was made by a human or by AI. It also checks for copied text, like from other websites or papers.

People who write for websites, teachers, and others use it to make sure content is truly original and not just copied or quickly made by an AI tool like ChatGPT.

It helps them find out if text is likely written by a person or if it matches other writing found online.

3. GPTZero

GPTZero is a simple tool you can use online to help figure out if text was written by a human or by AI programs like ChatGPT.

You just paste the text into GPTZero, and it will tell you how likely it is that AI wrote it.

It also highlights parts of the text that seem machine-made.

Students, teachers, and professionals use it to check homework, articles, and documents.

It’s easy to use, free for basic checks, and even lets you upload files like PDFs.

4. Winston AI

Winston AI is an AI detection tool designed to identify content generated by AI models like ChatGPT, GPT-4, Gemini, Claude, and others.

This tool also finds copied text. It works for different languages such as English, French, and Spanish.

It comes with extra features too, like a web browser add-on, scores that show how easy text is to read, and colored maps that point out parts likely written by AI.

It provides a free trial with 2,000-word credits, while paid plans start at $12/ month for 80,000 words.

5. Undetectable AI

Undetectable AI is a tool that helps people check if a piece of writing was made by artificial intelligence (AI) and also helps rewrite AI-generated text so it looks like it was written by a human

It’s great for people who want their content to pass AI detectors while still sounding natural and easy to read.

6. StealthGPT

StealthGPT is a tool that checks if text is written by a human or created by AI, like ChatGPT.

It’s easy to use: you paste your text, click a button, and it tells you if the text seems AI-generated.

It’s free, works fast, and helps students, teachers, and writers ensure content is original. StealthGPT also has a feature to make AI-written text sound more human

7. Quillbot

QuillBot AI Detector is a free tool that helps you check if a piece of text was written by a human or by an AI like ChatGPT.

It’s easy to use, just paste your text, and it will quickly tell you how likely it is that the content was generated by AI.

This is helpful for students, teachers, and writers who want to make sure their work is original or not fully written by a machine.

8. Crossplag AI

Crossplag AI is a tool that helps you check if a piece of writing is original or copied.

It uses advanced technology to compare text and find similarities with other sources.

This makes it useful for students, teachers, and writers who want to ensure their work is honest and unique.

You can easily verify the authenticity of your content.

9. Corrector App

Corrector App is mainly a tool to check your writing for grammar mistakes and spelling errors.

It also has a part that tries to tell if text was written by AI, but its main job is fixing grammar and spelling.

Final Thoughts

When you use AI to create writing, it’s very important to check if it’s original. Free tools that find AI writing can be a great help.

Students can use them to make sure their school work is their own, teachers can check for cheating, and writers can prove their content is real. These tools are great helpers for everyone.

Each tool listed is good at different things. Some are for quick checks, others do deep analysis, and some find if writing is copied.

Depending on your needs, you might prefer a fast and simple option like Detecting-AI or a more comprehensive tool like Undetectable AI or GPTZero.

Checking your writing often with AI tools is helpful. It makes your work clear, trustworthy, and good when you share it.

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