Last updated 08-13-2026
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AI Undetect
AI Undetect checks whether text reads as AI-written, then rewrites it to pass popular detectors. Paste up to 250 words on the free checker, run a multi-detector scan, and hit Humanize AI to paraphrase flagged content. Rewrite styles cover academic, blog, formal, and informal tones across 20+ languages.
Most humanizer tools rewrite blind. AI Undetect runs your draft against GPTZero, CopyLeaks, Writer, Winston AI, Turnitin, and Originality AI first, then offers Manual or Auto-Perfect rewriting with its Undetect V3 model trained on a 1B-token corpus. That detect-then-fix loop targets students, SEO writers, and marketers who need to see detector scores before paying for a rewrite.
Freelance writers, content marketers, SEO specialists, and students submitting AI-assisted drafts are the core audience. The site reports 300,000+ users and offers file uploads (.txt, .md, .pdf, .docx up to 10MB), rewrite history, and a REST API for teams embedding humanization into their own workflows.
Checks text against GPTZero, CopyLeaks, Writer, Winston AI, Turnitin, and Originality AI in one scan
Free tier includes 500 humanizer words and 10 AI detector uses after registration
Yearly Standard plan is $10 per month for 50,000 humanizer words and unlimited daily detector checks
Auto-Perfect mode iterates rewrites until content passes detection (premium subscribers only)
Supports 20+ languages including English, Spanish, Portuguese, German, French, Japanese, and Korean
REST API rewrites 100 to 10,000 characters per request with quality, balance, or human-focused models
Runs multiple AI detector checks before rewriting so you see exactly what failed
20+ language support with style presets for academic, blog, formal, and informal writing
Generous free tier of 500 humanizer words and 10 detector uses after registration
REST API lets teams embed humanization into existing content workflows
Auto-Perfect mode requires a paid subscription, limiting free users to manual rewrites
Free homepage checker caps input at 250 words per scan
Ethical and academic integrity concerns apply when using the tool to bypass Turnitin or similar detectors
Is AI Undetect free to try?
Yes. AI Undetect offers 500 free humanizer words and 10 AI detector uses after you register. The homepage checker also lets you paste up to 250 words and run a free AI score check before signing up.
Which AI detectors does AI Undetect check?
AI Undetect integrates GPTZero, CopyLeaks, Writer, Winston AI, Turnitin, and Originality AI. You see results from multiple detectors in one scan before choosing to humanize the text.
How much does AI Undetect cost?
On the yearly plan with 60% off, AI Undetect Basic is $5 per month for 10,000 words, Standard is $10 per month for 50,000 words, and Pro is $20 per month for unlimited words. Monthly billing without the yearly discount starts at $15 per month for Basic.
What is Auto-Perfect mode on AI Undetect?
Auto-Perfect is AI Undetect's premium rewriting mode that automatically refines text until it passes AI detection. Manual mode is free but may need extra edits, while Auto-Perfect runs continuous refinement for subscribers.
What file types can AI Undetect process?
AI Undetect accepts .txt, .md, .pdf, and .docx uploads with a maximum file size of 10MB. You can also paste text directly or try the sample text on the homepage.
Does AI Undetect offer an API?
Yes. AI Undetect provides a REST API at aiundetect.com/api/v1/rewrite for automated humanization. New API users get two free uses, and paid API plans start at $15 per month for 30,000 words.