.md — Markdown
Lightweight plain-text formatting syntax that renders into styled HTML. Widely used for documentation, READMEs, and notes.
Also known as: .markdown, .mdown, .mkd
Source code is plain text and doesn't execute on its own — it has to be compiled or run by a specific tool, which is where any real risk would occur.
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Frequently asked questions
What is a .md file?
Lightweight plain-text formatting syntax that renders into styled HTML. Widely used for documentation, READMEs, and notes.
Can I edit a .md file?
Yes — .md files are commonly editable with software such as Any text editor.
Does having a .md extension mean the file is safe?
No single extension can guarantee that. Source code is plain text and doesn't execute on its own — it has to be compiled or run by a specific tool, which is where any real risk would occur. Always consider where the file came from, not just its name.