Markdown Now Has a Uniform Type Identifer (UTI) in Apple’s Version 27 OSes
Apple's third developer betas of its version 27 operating systems introduce a built-in Uniform Type Identifier (UTI) for Markdown: `net.daringfireball.markdown`, which conforms to `public.utf8-plain-text`. The author has updated their own recommendation to match this UTF-8 encoding requirement.
Background
Apple's "Version 27 OSes" (iOS 27, macOS 27, etc.) are the latest generation of Apple operating systems, currently in developer beta. A Uniform Type Identifier (UTI) is Apple's system for tagging file types and data formats so apps know what they're dealing with. Until now, Markdown — the lightweight plain-text markup language invented by John Gruber (author of this post) in 2004 — had no official Apple-recognized UTI. The new identifier `net.daringfireball.markdown` is a nod to Gruber's own website and project. It "conforms to" `public.utf8-plain-text`, meaning the system treats it as a subtype of UTF-8 plain text. This is a minor but notable standardization step: apps on Apple platforms can now formally declare support for Markdown, and the OS can treat `.md` files with more specificity than just "plain text." The mention of UTF-8 vs plain text reflects an old ambiguity — early Markdown files had no guaranteed encoding — that is now resolved by requiring UTF-8.