Can AI writing tools accidentally plagiarize someone else's work?

Yes, AI writing tools can reproduce text that's very similar to existing copyrighted material, though it's usually accidental rather than intentional copying. Most AI models are trained on vast amounts of public text — books, articles, websites, social media posts — and sometimes they memorize phrases or passages rather than truly understanding and rephrasing concepts. I've seen this happen firsthand. A colleague ran a product description through a popular AI tool and it spit out a paragraph nearly identical to one from a major competitor's website. We caught it before publishing, but it was a close call. The risk is higher when you're writing about very specific, well-documented topics where there are only so many ways to explain something. Think about explaining how photosynthesis works — there's bound to be overlap. The safer approach is to treat AI output as a rough draft, not a finished product. Always run key passages through a plagiarism checker like Copyscape or Grammarly's plagiarism tool. Better yet, rewrite the AI's suggestions in your own voice. For a deeper dive, see our guide on AI content copyright and legal issues. **Related**: How do I check if AI-generated text is plagiarized? | Is it legal to use AI-generated content on my website?