Evidence mounts that AI-written books are consuming the publishing industry: in 2025, the number of self-published books jumped by 40% YoY, from 2.5 million to 3.5 million. Running a random sample of these books through an AI detection tool shows a 40% YoY increase in books flagged as AI.
Summary
Self-published books surged 40% year-over-year in 2025 (2.5M to 3.5M), with AI detection tools flagging a corresponding 40% increase in AI-written content, showing nearly 20% of sampled novels contain substantial AI-generated text.
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