.md

Low risk

Markdown

Markdown source. A lightweight markup language used by GitHub READMEs, static site generators, and most technical blogs.

MIME types

text/markdown

Category

text

Aliases

.markdown / .mdx

What opens this file

VS Code
Obsidian
Typora
Notion (via import)
GitHub

How to open by OS

Windows

VS Code, Obsidian, Typora.

Mac

VS Code, MacDown, Typora.

Linux

VS Code, Obsidian.

Ios

iA Writer or Bear.

Android

Obsidian Mobile or Markor.

Safety notes

Markdown itself is inert, but many parsers allow raw HTML. Always sanitize user-provided Markdown before rendering publicly to avoid XSS.

Common mistakes

CommonMark, GFM, and MDX differ in subtle ways. Verify syntax support when migrating tooling.
Using absolute image paths breaks as soon as the repo moves. Prefer relative paths.

Related extensions

References