AI Detector Free
Check If Text Is AI Generated Instantly
Instantly detect if content was written by ChatGPT, Claude, or other AI models. Get detailed analysis with confidence scores and sentence-level breakdown.
- No sign-up, no credit card
- 10 free uses every day
- Works on phone and desktop
How to Detect AI Content in Three Steps
Three steps from your text to a score
Upload Your Content
Paste text directly, upload an image with text, or submit a PDF document. Our AI detector supports multiple input formats for maximum flexibility.
AI Analyzes Patterns
Our advanced algorithm examines sentence structure, vocabulary diversity, writing patterns, and stylometric markers to identify AI-generated content.
Get Detailed Results
Receive a comprehensive report with AI probability score, confidence level, sentence-by-sentence analysis, and specific indicators explaining the detection.
Why Use Our Free AI Detector
What it checks and what it gives you back
Free Detection, No Account
Analyze text completely free, with 10 uses a day across all our AI tools. No hidden costs and no account registration required. Check documents of up to 10,000 characters each.
Multi-Model Detection
Flags writing patterns typical of ChatGPT, GPT-4, Claude, Gemini, and other LLMs. No detector is perfect, so every result comes with a confidence level you can weigh.
Detailed Analysis Report
Get more than just a score. Our AI detector provides sentence-level analysis, specific indicators, human vs AI pattern breakdown, and confidence ratings. Copy the report or download it as a text file.
Multiple Input Formats
Submit content in the format that works for you. Paste text directly, upload images for OCR analysis, or submit PDF documents. All formats are processed with the same accuracy.
Who Can Benefit from AI Detection
Who it is for and what they use it for
Educators & Teachers
Verify student submissions for academic integrity. Quickly check essays, papers, and assignments to ensure original work while maintaining fair grading standards.
Content Managers & Editors
Ensure content authenticity before publication. Screen articles, blog posts, and submissions to maintain quality standards and avoid AI-generated filler content.
Hiring Managers & HR
Evaluate candidate applications for authenticity. Check cover letters, writing samples, and test responses to identify genuine talent and communication skills.
Frequently Asked Questions
Questions people ask
How does the AI detector work?
Our AI detector uses advanced natural language processing to analyze text patterns that distinguish human writing from AI-generated content. It examines sentence structure uniformity, vocabulary diversity, perplexity (predictability), burstiness (variation in complexity), and stylometric markers. The algorithm compares these patterns against known signatures of AI writing to provide an accurate probability score.
Is this AI detector really free?
Yes, our AI detector is completely free to use with no hidden costs or premium tiers. You can analyze up to 10,000 characters per submission without any registration or account creation. Free use covers 10 requests a day, shared across every Primo Notes AI tool, and the allowance resets every 24 hours.
Which AI models can be detected?
Our detector looks for writing patterns shared by all major AI models including ChatGPT (GPT-3.5, GPT-4, GPT-4o), Claude, Google Gemini, Meta LLaMA, and other large language models. It does not name the model that wrote a text; it reports how likely it is that any AI did.
How accurate is the AI detection?
Our AI detector provides high accuracy for most text, but no detector is 100% accurate. Accuracy depends on text length (longer texts provide better results), the AI model used, and any post-editing applied. We provide confidence levels (low, medium, high) with each result so you understand the reliability of the detection.
Can I check images and PDFs for AI content?
Yes! Our AI detector supports multiple input formats. You can upload images containing text (JPG, PNG, GIF or WebP, up to 5 MB) and we'll extract the text before analysis. You can also submit PDF documents up to 10 MB. The result shows the extracted text so you can check it was read correctly, and all formats receive the same detailed analysis.
What text length works best for detection?
For the most accurate results, we recommend submitting at least 150-200 words. The minimum requirement is 50 characters. Longer texts (500+ words) provide the most reliable detection because the algorithm has more data to analyze patterns and identify AI signatures.
Do I need to create an account?
No account or registration required! Visit the page, paste your text or upload a file, and click detect. It's completely anonymous and instant with no signup process or personal information needed.
Can AI-generated text be edited to avoid detection?
Heavily edited or paraphrased AI content may reduce detection accuracy. Our detector looks for subtle patterns that often persist even after editing, but significant human revision can make detection more challenging. We provide detailed indicator breakdowns to help you understand what specific patterns were identified.
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