Scribbr — AI for Students, Study & Research

When you encounter a text that feels impersonal or too perfect, you may question its origin. Scribbr's AI Detector is designed to address this uncertainty by providing a data-informed first opinion. You can paste in a piece of writing—whether a student's essay, a job applicant's cover letter, or a freelancer's article—and the tool analyzes it for patterns typical of AI generation. It looks for characteristics like low perplexity (predictable word choices) and uniform sentence structure, which AIs often produce. The result is a simple percentage score representing the probability of AI authorship. This gives you a quick, accessible starting point for further investigation. It is important to understand that this tool, like all AI detectors, works on probability, not certainty. It is a statistical guide, not a definitive verdict. False positives can and do occur, sometimes flagging human writing that is formulaic or written by someone for whom English is a second language. Therefore, the score should be treated as one piece of evidence among many, not as standalone proof.