Top 14 Free AI Content Detectors and Humanizer Tools for 2025

As of now, almost 10% of all Internet content is artificial intelligence generated. 

Since AI tools made big headlines in 2023, almost all industries in the digital space raced towards content generation with AI. 

But that brings us to another dilemma! Which content is AI produced and which one’s handwritten like in the good old days. 

This is where AI detection tools come in. Free ai detection tools helps you 

• Verify content authenticity
• Detect plagiarism
• Comply with academic guidelines

AI humanizer tools on the other hand, helps rewrite the AI generated contents to make them more—humane.

Let us walk you through the top, free AI text detectors and humanizer tools. The first entry is…

1. Humanize AI

Humanize AI humanizer tool is well known for paraphrasing.

Humanize AI is the first AI humanizer that comes to everyone’s mind—whether a digital marketer, content creator, or scholar—when they think of humanizing AI text. It is the best AI humanizer tool so far, with over 5,800,000+ users and the capability to humanize over 1.1 billion words monthly.

Its ability to bypass AI checker has consistently amazed everyone, boasting a 99% success rate. No other AI humanizer has surpassed Humanize AI in effectively humanizing text.

Its unique keyword freeze feature, different readability styles, and available modes like Basic, Aggressive, and Enhanced differentiate it from all others. This AI humanizer is not only the top choice but also the most affordable one.

Features

• Keyword Freezer: Allows you to freeze important keywords and maintain your brand voice.
• Different Modes: Offers flexibility with modes like Basic, Enhanced, and Aggressive, enabling you to choose the best option for bypassing various classes of AI detectors.
• Fastest Humanization: The fastest AI humanizer with an efficient conversion process.
• SEO Optimized: Humanizes text while preserving important SEO keywords.
• Show Difference Feature: Enables you to compare the AI input and the humanized output, making it clear what has changed during the humanization process.

Pros	Cons
Includes unique metrics like Show Difference and Keyword Freezer.	No significant cons.
Affordable paid plans.
Unlimited free usage with a cap of 350 words per process.
High-quality outputs that are error-free.

Pricing

Premium plans start at $30, offering 100,000 words for humanization.

2. QuillBot

QuillBot AI Detector and Humanizer Tool is popular for its paraphrasing tools and very often used in blog and journal writing.

QuillBot is mainly popular as a paraphrasing tool, but it also offers a powerful AI checker feature. 

Plus, you can try out the other writing enhancement tools like grammar and plagiarism checker.

Features

• AI Detection: Evaluates texts to determine what percentage of the contents is AI-generated, AI refined, or human written 
• AI Paraphrasing: Maintain the original meaning while rewording text
• Summarization: Condenses lengthy text
• Grammar Checker: Identifies and corrects grammar mistakes
• Plagiarism Checker: Checks for copied content

Pros	Cons
Easy-to-use interface	AI detection may lack precision
Comprehensive writing tools
Free version available

Free Plan Capabilities

Basic features and up to 1200 words can be checked at a time. 

Pricing

Premium plans start at $4.17/month, offering unlimited access to all features.

3. Originality.AI

Originality.AI is is a content verification tool tailored for educators and publishers

Originality.AI is an advanced AI content verification tool tailored for educators and content publishers.

It specializes in detecting AI generated text and checking for plagiarism, giving you a comprehensive content analysis platform.

Features

• AI Detection: Identifies AI writing tool generated texts 
• Plagiarism Checker: Cross-checks text against online sources

Pros	Cons
High accuracy	Free version offers limited scans
Combines plagiarism checking and AI detection	Geared for professional users and educators
Detailed originality reports

Free Plan Capabilities

Free AI content detector allows up to 2000 words can be scanned in one go. 

Pricing

Plans start at $14.95 per month, with scalable options based on usage. 

4. GPTZero

GPTZero is one of the most used free AI texts detectors by a Princeton University student

GPTZero is one of the most used free AI texts detectors developed by a Princeton University student. It’s focused on  identifying texts created by GPT-based AI models like ChatGPT 3 and ChatGPT4. 

It’s quite popular among educators, as it evaluates text for human vs. AI authorship by analyzing complexity and variations in writing.

Features

• AI Detection: Identifies GPT-generated text
• Perplexity Score: Assesses text randomness
• Burstiness Score: Evaluates sentence structure variation

Pros and Cons  AI Checker

Pros	Cons
Free plan allows 10,000 word scans per month	Less effective for non-GPT AI content
Specializes in GPT-generated text detection	Limited features
User-friendly interface

Free Plan Capabilities

Detects GPT-3 content with no cost and supports up to 5000 characters in each scan. 

Pricing

Plans start from $14.49 per month with higher tier plans available. 

5. ZeroGPT

ZeroGPT is a straightforward, free to use AI text detection tool

ZeroGPT is a straightforward and user-friendly AI-generated text detection tool. 

It uses advanced algorithms to provide a probability score indicating whether content was written by a human or AI. 

Just remember that there are many lookalike sites with the same name and different domain extensions. 

Features

• AI Detection: Offers a confidence score for AI-generated text
• Highlights AI Parts: It highlights the sentences that are more likely to be AI generated

Pros	Cons
Simple and intuitive interface	Limited additional features beyond AI detection
Suitable for a variety of users, including educators and content creators

Free Plan Capabilities

Check 15,000 characters per session. 

Pricing

Pricing starts from $9.99 per month. 

6. Copyleaks AI Content Detector

Copyleaks AI Content Detector is superb useful in pagiarism detection

Copyleaks is a veteran name in plagiarism detection and now offers an AI content detector. 

The tool easily identifies texts created by various AI models like ChatGPT, GPT-4, and Gemini. Plus, It supports multiple languages and file formats, making it a versatile tool. 

Features

• AI Content Probability: Assigns scores to AI-generated texts 
• Highlighting: Identifies specific sections that’s likely produced by AI
• Language Support: Detects across multiple languages
• Integrations: Plugins for platforms like Chrome and LMS tools

Pros	Cons
High accuracy	Limited free version capabilities
Combines plagiarism and AI content checks	Needs more improvement
User-friendly interface

Free Plan Capabilities

Scan up to 25000 characters each time without logging in.

Pricing

Ai detector costs $9.99 per month. 

7. Crossplag AI Detector

Crossplag helps with both plagiarism and AI detection

Crossplag is a dual-purpose tool with both plagiarism and AI detection. It’s ideal for educators and content creators looking to achieve or verify originality. 

Its unique thermometer scale visually indicates AI produced content usage. 

Features

• Visual AI-Generated content probability score
• Plagiarism detection
• Accepts multiple document formats
• Connects with other platforms for seamless analysis

Pros	Cons
Dual-purpose detection for plagiarism and AI content	Free version has limited analysis capacity
Supports multilingual analysis	AI detection features are still being refined
User-friendly visual indicators	Cannot use without logging in

Free Plan Capabilities

Basic AI and plagiarism detection with restrictions on word count.

Pricing

Premium plans are not available publicly. You need to make a quote request to get pricing. 

8. Writer AI Content Detector

Writer.com’s AI Content Detector offers an efficient way to verify AI-generated text

The Writer AI Content Detector, developed by Writer.com, offers an efficient way to verify AI-generated text.

Its user-friendly design makes it an excellent tool for bloggers, marketers, and researchers.

Features

• Displays AI-generated content percentage 
• Highlights AI-Generated sections
• Simplifies navigation and result interpretation
• Integrates with other platforms for automated workflows
• Directly fetches contents from page links

Pros	Cons
Provides fast, real-time analysis	Limited to AI detection
Free to use	Detection accuracy requires refinement
Backed by an experienced AI team

Free Plan Capabilities

Scan up to 5000 words in one, the most generous word limit in this list. 

Pricing

Paid plan costs $18 and comes with various other writing tools. 

Now that we know how to detect the AI generated contents, let’s check out the tools that help with humanizing the contents. 

9. SemiHuman AI

SemiHuman AI humanizer is known for advanced text conversion technology

SemiHuman AI is a leading AI humanizer tool known for its advanced text conversion technology. 

It ensures your content achieves a perfect human score on all major AI detectors, including Originality.AI and GPTZero.

Features

• Multiple humanization modes 
• Fast processing time
• Built-in AI detection and watermark removal

Pros	Cons
Highly accurate at bypassing detectors	Limited functionality in the free version
SEO-friendly, keyword-rich outputs
Maintains original meaning while improving readability

Free Plan Capabilities

Allows 250 words per scan, per month. 

Pricing

Basic pricing comes at $9 and Pros costs $13.50.  

10. Humbot

Humbot is a top-rated AI humanizer that can bypass all major AI detection platforms

Humbot is another top-rated AI humanizer that is shown to bypass all major AI detection platforms, including Originality.AI, GPTZero, and Turnitin. 

Humbot’s robust technology ensures your content consistently achieves perfect human scores, making it a reliable tool for educators, writers, and marketers.

Features

• High precision in AI detection evasion.
• Produces high-quality text requiring minimal editing.
• Integrated AI scanning for streamlined workflow.

Pros	Cons
Outperforms major AI detectors	Free plan has limited features
Creates polished, human-like content
User-friendly and efficient

Free Plan Capabilities

Humanize 300 words per session. 

Pricing

Premium options start from $11.99 per month. 

11. AIHumanizer

AIHumanizer has three distinct bypass modes—Fast, Creative, and Enhanced

AIHumanizer is a flexible AI humanizer with three distinct bypass modes—Fast, Creative, and Enhanced

Utilizing these modes you can tailor the output to your specific needs. It’s particularly useful for students, bloggers, or marketers because of its polished, human-like content.

Features

• Three bypass modes for customized results
• Efficient processing time 
• High-quality, human-grade content

Pros	Cons
Versatile modes	Larger text processing requires a paid plan
Affordable pricing
Suitable for diverse audiences

Free Plan Capabilities

Basic humanization for 150 words per input and 500 words per month. 

Pricing

Paid plans start from $19.99 per month and unlock processing larger texts.

12. Writesonic

Writesonic is a versatile AI writing tool that quickly generates high-quality contents

Writesonic is a versatile AI writing tool that quickly generates high-quality contents and caters to various needs like articles, advertisements, and landing pages. 

It’s fast, reliable and lets you choose from different tone of voice to humanize your contents 

Writesonic stands apart from other free AI detectors due to their content tone changer tools.

Features

• Fast content generation
• Creates multiple versions of content for selection
• Grammar and plagiarism check

Pros	Cons
Rapid content creation	Limited customization options in the free version
Ideal for diverse writing tasks

Free Plan Capabilities

Humanize 200 words in each go and allow up to 3 sessions. 

Pricing

Paid plans start at $20 per month.

13. Bypass AI

Bypass AI is a feature-rich AI humanizer that converts AI texts into natural language

Bypass AI is a feature-rich AI humanizer that converts AI-generated texts into natural, human-like language. 

Its diverse bypass modes make it suitable for various types of content.

Features

• Three bypass modes
• High-speed processing 
• Compatible with all major AI detection platforms

Pros	Cons
Lots of features and functions	Need to log in to use platform
Excellent compatibility with detection tools
Quick and efficient processing

Free Plan Capabilities

Basic plan allows 500 word humanization. 

Pricing

Start from $9.99 per month. 

14. AI Undetect

AI Undetect specializes in bypassing all major AI detection tools

AI Undetect specializes in bypassing all major AI detection tools including GPTZero, Copy Leak, ChatGPT, Claude, Writer, Sapling. 

It uses advanced paraphrasing models and has unique features for fine-tuning.

Features

• Adjustable humanization aggression 
• Simple, user-friendly interface

Pros	Cons
Flexible settings for different detection tools	Limited effectiveness against certain AI detectors
Produces clean text with minimal grammar errors	May require manual edits
Easy-to-use interface

Free Plan Capabilities

Supports 250 words in each input with basic humanization customization. 

Pricing

Premium plans start from $12 per month. 

Why AI Content Detector Tools and Humanization AI Tools are Important

With the rise of AI tools like ChatGPT, Gemini and Lensa AI, AI-generated content is now more sophisticated and widely used. AI contents can’t help but come with 

• Robotic tone 
• Lack of emotional engagement
• Factual inaccuracies 
• Plagiarism risks 
• Fix content quality issues

Detecting AI content helps various professionals combat these issues, 

• Academic Institutions: To uphold academic integrity 
• Content Marketers: To ensure originality and alignment with user expectations
• Editors: For maintaining content quality

Humanizing AI Contents Benefit Professionals and Marketers by 

• Enhancing readability and relatability
• Aligning content tone and style with audience preferences
• Improving SEO to meet Google’s originality standards 

How to Select from Free AI Detectors? 

When evaluating an AI detector tool and humanization apps, keep the following things in mind:

Accuracy

Choose tools that have a proven track record of reliability, especially if you are in the academic, professional, or marketing field

Ease of Use

Go for tools with user-friendly interfaces 

Features

Does the tool offer additional functionalities like plagiarism checks, multilingual support, or detailed analytics? The more, the merrier

Limitations

Understand the constraints, such as character limits, false positives, or tool-specific restrictions

Your Needs

Select tools tailored to your role 

Some Practical Usage of AI Detection and Humanizer Tools

• Education: Detecting AI-generated assignments submitted by your students
• Publishing: Ensuring articles disclosed as human-written are not actually AI-generated
• Marketing: Preventing deceptive or manipulative AI content creation 

How Does AI Content Detection Work?

AI content detection tools leverage machine learning algorithms trained on extensive datasets containing both human-written and AI-generated text. 

These tools analyze patterns, linguistic structures, and statistical markers to estimate the likelihood of AI involvement in the content.

Detection algorithms often focus on:

• Linguistic nuances like repetitive sentence structures or overly formal language 
• Statistical markers such as consistencies in text randomness and sentence variation
• Pattern recognition: Identifying keywords or style characteristics of AI-generated text

FAQs 

Q: Is there a free AI detector?

A: Yes, tools like OpenAI’s Text Classifier, QuillBot, Originality AI and GPTZero offer free AI detection capabilities. Although, it may come with limitations. 

Q: Are there free AI humanizer tools?

A: Yes, there are many free AI humanizer tools that you can use, however, almost all of them come with limitations. There are other detectors that can be helpful too.

Q: Can AI-generated text become undetectable?

A: Not really. AI detection technologies are constantly evolving and can still identify patterns.

Q: Can free detectors identify GPT4 and Gemini texts?

A: Yes, tools like GPTZero and QuillBot can easily detect AI-generated text but may vary in accuracy.

Q: What is the best tool to detect AI content writing?

A: There’s no single “best” tool. Effectiveness depends on your needs, such as accuracy or integration options.

Q: Can Google and other search engines detect AI content?

A: Yes, Google’s ever evolving algorithms can detect AI-generated content. Other search engines have also placed measures such as AI detectors for ChatGPT, Gemini, Perplexity. However, Google declared that AI generated content is not always a basis of site ranking penalty. By combining Google’s EEAT (expertise, experience, authority, and trustworthiness) guidelines into your Ai generated contents you can still rank for targeted keywords. 

Q: How accurate are AI detection tools?

A: The tool’s accuracy depends on the quality of the algorithms and task complexity. Issues like technical flaws or human error can lower accuracy so make sure to double-check results.

Q: Is there a free version of Undetectable AI?

A: Yes. Undetectable AI has a free usage option where you can humanize 15000 characters per input but free users get only 250 words worth of credit. 

Q: How accurate is Scribbr’s AI detection software?

A: Scribbr claims to be the best AI content detection tool out there with some very cool features. However, users often report false positive results. 

Q: How do I interpret the AI score?

A: AI content checkers typically show results as a percentage score, indicating the likelihood of a piece of text being AI generated or significantly influenced. A higher score means a greater probability of AI involvement in the content creation. 

Q: Can the AI content detector tool suggest improvements for my content?

A: Unfortunately no. While AI content detector tools can identify the likelihood of AI-generated contents, they are not capable of suggesting content improvements. It’s best to use a humanizing tool to paraphrase the content. 

Q: How accurate is QuillBot’s AI Detector?

A: Quillbot’s AI detector is fairly good at content authenticity detection and paraphrasing. However, advanced tools like Turnitin’s algorithms have found ways to detect if a content is paraphrased by Quillbot. 

Q: How is AI-generated content detected?

A: AI content detector tools use machine learning algorithms and are trained on both human-written and AI-generated texts to tell the difference. 

Q: Do AI detectors actually work?

A: Our own tests show that AI content detection tools return accurate results in 80-90% of cases. 

Q: Can AI checkers be biased?

A: It depends on the data that the AI algorithm was trained on. Many users reported that their AI detector produced biased outputs against non-native English writers. 

Q. Is Grammarly’s AI content detector accurate?

A: Grammarly offers an AI grammar checker that greatly helps in errorfree writing process. 

Q. Can ChatGPT be detected?

A: Sure. AI checker tools like GPTZero, ZeroGPT, Writer AI  tell if the AI generated content was ChatGPT generated. 

Q. Why is my writing flagged for AI?

A: It means that the platform where you are uploading your contents, has a built in AI detection tool and it has recognized some part of your contents as Ai generated. 

Q: What are different types of AI detectors?

A: Here is a simple breakdown to different types of AI detectors:

• Image Recognition: Classifies objects in images/videos
• Data Anomaly Detection: Identifies irregularities in datasets
• Speech Recognition: Processes spoken language
• Fraud Detection: Spots suspicious behaviors in transactions

Q: Which plagiarism checker is best for educators and students?

A: Grammarly, Turnitin, Plagiarisma, and Quetext are well known for their accurate plagiarism detection and are widely used by educators, students and other scholars. 

Q: Do AI content detectors work for multiple languages?

A: Some AI content detectors such as Originality AI and Copyleaks support analyzing and detecting AI-generated content in multiple languages.