Unfox AI
Free online AI content detectorSpot AI-written text with sentence-level highlighting, free and no signup
Highlights
What you can do with it
- A teacher checks student papers for originality before grading.
- An SEO editor filters filler paragraphs before publishing an article.
- A recruiter reviews whether an applicant report was written by AI.
How to use it
- 1 Open the Unfox AI Content Detector website.
- 2 Choose your input: paste text, upload a file or use sample text.
- 3 Click Detect to start the analysis.
- 4 Read the sentence-level highlighted results and the AI versus human ratio.
- 5 Revise the content based on what you find.
Who it is for
Pros
- Free version with no registration, plus batch and API options for volume.
- Sentence-level results are easier to act on than a single score.
- Covers multiple languages and AI models in one tool.
Limitations
- Detection is not perfect; results are for reference and should not be the sole basis for academic or disciplinary decisions.
- The free version may have limits compared with paid or API use.
- Rules on AI use differ by school and platform, so check policy before acting on a result.
What Unfox AI is
Unfox AI Content Detector is an online tool for spotting text generated by AI. Its core job is to tell whether a piece of writing was produced by a model such as ChatGPT. It runs on a deep-learning detection engine that studies features like text perplexity and burstiness, so even AI-written content with some editing can be examined. Rather than only a cold score, it marks each sentence as suspected AI-generated or human-written, which makes the result easier to act on. It covers multiple languages and models, supports batch document uploads and API integration, and offers a free version that needs no registration. It is aimed at educators, editors, recruiters and site operators.
What you can do with it
- Paste text, upload a file or use sample text, then click Detect.
- Read sentence-level highlighting that shows which lines look AI-written.
- See the overall ratio of AI-generated to human-written content.
- Scale up with batch uploads or the API when you review a lot of content.
Who it is for
- Educators and students checking originality in academic work.
- Content creators and editors protecting article quality and originality.
- Recruiters and due-diligence staff reviewing whether applicant materials are genuine.
- Site operators scanning content to reduce the risk of search penalties.
What to watch out for
Detection is not perfect, and no tool can prove authorship with certainty, so treat results as one reference, not a final verdict. Do not use a single score as the sole basis for academic or disciplinary decisions; follow your school or platform rules, since decisions and their consequences rest with you. The free version may have limits next to paid or API use, and accuracy can vary by language, topic and how heavily the text was edited.
FAQ
Is it free?
A free version is available without registration.
How accurate is it?
The site states a false-positive rate under 0.2 percent and accuracy up to 99.8 percent on its test sets.
What does the report show?
Sentence-level highlighting plus the ratio of AI-generated to human-written content.
Can I use it for grading?
Treat it as one reference only; check your school's rules, since decisions and their consequences rest with you.
Why it is free
What the official page says： free version
Free limits, trial length and features are decided by the official site and can change at any time.
Product preview
Screenshot archived from the listing page, for preview only.
