Apple's first macOS 27.3 test version shows Markdown files with real formatting in Quick Look, so notes and instruction files are easier to read at a glance.
Apple's first test version of macOS 27.3 changes how a common type of text file looks on the Mac. Files ending in .md, called Markdown files, now appear in Quick Look with proper headings, bold text and links. Before, the preview showed raw symbols.
Quick Look is the preview you get by selecting a file and pressing the spacebar. Markdown is a simple way to format text using a few typed characters. John Gruber created it in 2004. People use it for documentation and for publishing content online. With macOS 27.3 beta 1, the preview shows the finished look without opening a separate app.
Apple has been adding Markdown support across its platforms, including import and export in Notes. The format has also become important for AI agents, which use .md files to store instructions and context. Federico Viticci noted that Apple's new Siri AI app skills feature uses Markdown-based SKILL.md files. Developers use them to give Siri instructions for complex tasks inside their apps.
This is beta 1, an early test version, so details could change before the final release. The material does not say when macOS 27.3 will be released to everyone. The same beta also brings Safari features such as Vertical Tabs and Adaptive Dark Mode, plus expanded Siri AI capabilities and new developer tools.
If you handle Markdown notes or instruction files, macOS 27.3 will let you read them formatted by pressing the spacebar once it is released.
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