AI Content Detector — Free Online Tool

This tool analyses text for statistical patterns associated with AI-generated writing and for phrasing that appears to be reproduced from elsewhere, returning an assessment rather than a verdict.

It is important to be honest about reliability, because a great deal of harm has been done by treating these tools as authoritative. AI-detection classifiers work by measuring statistical properties of text — how predictable each word is given the ones before it — and human writing that happens to be clear, formulaic, or plainly structured scores as machine-generated with uncomfortable frequency. The documented bias against non-native English writers is particularly well-established, since writing in a second language tends toward more conventional phrasing, exactly the signal these classifiers read as artificial. OpenAI withdrew its own detector in 2023 citing low accuracy, and no detector since has solved the underlying problem.

The practical consequence: a high score is a reason to look more closely, never evidence on its own. Accusing a student or a writer of misconduct on the basis of a detector score is unsafe, and institutions that have done so have had to reverse those findings. Process evidence — draft history, version control, the ability to discuss the work — is far more reliable than any classifier output.

Where the tool is genuinely useful is self-checking: reviewing your own draft before submission, spotting passages that read as unattributed from a source, or seeing which sections of your own writing read as mechanical and could use a human pass.

Your text is sent to a model for analysis and is not retained.

Our AI Content Detector is free to use with no signup required. This tool sends your input to CodexStudio's secure servers to complete the task; we do not keep your data after processing. Traffic is sent over HTTPS.

Whether you are a developer, designer, student, or business owner, this tool is designed to save you time and make your workflow more efficient. Bookmark this page to access it whenever you need it — it will always be free.