Is it legal to use AI to write a blog?

There is no law in the US, EU, or UK that prohibits using AI to write a blog. The legal questions that do matter are narrower than the FUD suggests, and most of them have clear answers in 2026.

The four real legal considerations:

• -Copyright: under the US Copyright Office's March 2023 guidance, purely AI-generated output is not copyrightable. A human-edited AI article can be registered, but only the portions reflecting meaningful human authorship (your own writing, selection, and arrangement) are protected. Light editing alone does not qualify.
• -FTC disclosure: required when AI is used in advertising claims or endorsements (FTC Endorsement Guides, revised June 2023, effective July 2023). Not required for general blog content. If your blog reviews products or makes earnings claims, disclose.
• -Platform terms: most CMS and ad platforms (Google AdSense, Mediavine, etc.) explicitly allow AI-assisted content. Some prohibit fully unedited AI dumps. Check the specific platform.
• -Industry-specific rules: medical, legal, and financial content has stricter requirements regardless of authorship. AI does not change those rules.

The practical legal posture: an AI-drafted, human-edited blog post on a normal topic, published on your own site, with no false product claims, is legal everywhere. Almost everything else people worry about is not actually a legal problem.