Markdown Now Has a Uniform Type Identifer (UTI) in Apple’s Version 27 OSes

The third developer betas of Apple’s 27 OSes dropped today, and this new page in Apple’s developer documentation drew my attention — a built-in Uniform Type Identifier for Markdown data:

The identifier for this type is net.daringfireball.markdown.

This type conforms to [utf8PlainText].

My main link here is to the Swift documentation, but it’s available in good old Objective-C too.

I had previously recommended conforming to public.plain-text but stated that the text encoding should be UTF-8. I’ve updated my own recommendation to public.utf8-plain-text to enshrine the UTF-8 encoding. (Back in 2004 UTF-8 support was far from universal. Today it is.)

★ Monday, 6 July 2026