AIundetect
AI Undetect · Writing · AI Detection
AI Undetect is a freemium tool that scans text against major AI detectors and rewrites flagged content into human-sounding copy. It supports 20+ languages and starts at $5/mo.
About AIundetect
What Is AI Undetect
AI Undetect is a web tool for people whose writing keeps getting flagged as machine-generated. It does two jobs in one place. First, an AI detector runs your text past several well-known detection engines at once and shows you the scores side by side. Second, an AI humanizer rewrites whatever fails, reshaping the wording so it reads like something a person typed. The point of both halves is to make your text undetectable AI, or something close to it.
The humanizer runs on a model the company trained in-house on a large text corpus, and it keeps working until the copy clears the detectors. You paste text, pick a style, and let it rework the passage. The result keeps your original meaning and your key facts, which matters if you're handling a report or an assignment rather than a casual post.
Two things shape when it fits. It's a rewriting layer, not a writing tool, so you still need a draft to feed it. And the free tier is capped by word count. Treat it as a way to clean up AI-assisted drafts you've already reviewed, not as a shortcut around actually checking your own work.
Getting Started
- Open aiundetect.com and paste your text into the input box, or upload a file. It accepts .txt, .md, .pdf, and .docx files up to 10MB.
- Run the detector. AI Undetect checks the text against several linked detection engines and returns the results together, so you see where the content stands before you change anything.
- Choose a rewrite style. Options include General, Informal, Academic, Blog, Simplify, Formal, and Expand, plus a slider for how hard the rewrite pushes.
- Hit Humanize AI text. The tool rewrites the passage and leaves the meaning intact. If it still scores as AI, run it again.
- Copy the output or pull it from your history. Paid plans add Auto-Perfect mode, which keeps refining until the text clears detection on its own.
Product Information
A quick look at AIundetect's pricing, supported platforms, and performance.
Best for
The users, tasks, and scenarios where this tool fits best.
Users
- Students
- Bloggers and content marketers
- Non-native English writers
Tasks
- Rewriting AI-assisted drafts before publishing
- Checking content before you send it
- Adapting one passage to several tones
- Embedding rewriting into your own product
Scenarios
- Cleaning up a batch of posts in one sitting
- Working across languages in a single session
- Testing whether a passage will pass
Key features
Built-In AI Detector
AI Undetect links several detection engines into one check, so you get results from more than one source instead of opening a tab for each. The company lists GPTZero, Copyleak, Writer, Winston AI, Turnitin, and Originality AI among the engines it queries. Running them together tells you how different systems score the same passage, which is useful because their verdicts often disagree. The detector is free to use, so you can test a passage before deciding whether to rewrite it.
AI Humanizer
The humanizer is the core of the product. It rewrites flagged text so it stops reading like a template, breaking up the even, predictable rhythm that detectors pick up on. The company says it trained the underlying model on a billion-token corpus and keeps refining it. Your meaning stays put while the phrasing loosens. If the first pass doesn't clear detection, you run it again, and the paid Auto-Perfect mode keeps looping until the text passes on its own.
Rewrite Styles and Tone Control
You're not stuck with one voice. The tool offers General, Informal, Academic, Blog, Simplify, Formal, and Expand, and a balance slider lets you push toward more human or more faithful output. That range covers the common cases: an academic paragraph needs to stay measured, a blog post can afford to sound looser, and a clunky sentence often just needs simplifying. Switching styles costs nothing but a rerun.
File Upload and History
Beyond pasting text, you can upload .txt, .md, .pdf, and .docx files up to 10MB, which saves time when working from a document rather than a browser. Every rewrite lands in your history, so you can pull earlier output back without redoing the work. For anyone handling more than the occasional paragraph, that record turns the tool from a one-off into something you actually return to.
Multilingual Support
AI Undetect works across more than twenty languages, including Spanish, Portuguese, German, French, Japanese, Korean, Russian, Arabic, and Hindi. You can paste text in the language you write in and get it back in the same tongue. For people who don't think in English, that removes the awkward step of translating first and rewriting second.
API Access
The API lets developers send text to the humanizer and get rewritten output back in a single request. Plans are priced by word volume, starting around $7.5/mo for a smaller monthly allowance and scaling up from there. The endpoint accepts a tone setting and an auto mode, so you can match the behavior of the web tool inside your own app or workflow. It's aimed at teams that need the rewriting at scale rather than one document at a time.
Pros and cons
Pros
- Detector and humanizer sit in the same place, so you can check a passage and fix it without switching tools.
- It queries several detection engines at once, which gives a fuller picture than any single checker.
- Support for 20+ languages means non-English writers aren't pushed into translating first.
- The free tier includes the detector and a starter credit balance, so you can test it before paying.
- File uploads and rewrite history make repeated, document-based work less tedious.
Cons
- It only rewrites text you provide. There's no drafting, research, or editing beyond the phrasing pass.
- Free and lower-tier word limits are tight. A single long report can eat a month's quota.
- No humanizer can guarantee a pass on every detector, and the company's own tool asks you to rerun when the first attempt fails.
- The Auto-Perfect mode that loops until text clears detection sits behind the paid plans.
Frequently asked questions
AI Undetect has two functions. It checks whether a piece of text reads as AI-generated by running it past several detection engines, and it rewrites text that gets flagged so it reads more like human writing. People use it to clean up AI-assisted drafts before submitting or publishing them.
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