What is MD Viewer?
An MD viewer renders a .md file so you can read it as a formatted document instead of raw text. The .md extension marks Markdown, a plain-text format used for documentation, notes and READMEs. This viewer accepts Markdown pasted from any file and renders it instantly in the browser, with no upload and no software to install.
Common Uses for MD Viewer
- Opening a .md file on a computer without a Markdown app
- Reading notes exported from Obsidian, Bear or Joplin
- Checking documentation files before publishing
- Rendering Markdown pasted from a chat or code review
Markdown and the .md Extension
Markdown files carry the .md extension (older documentation sometimes uses .markdown or .mdown). The format was designed to be readable as plain text and convertible to HTML, which is why it became the default for READMEs, wikis and developer docs. When you double-click a .md file on a computer with no Markdown app installed, you usually get a text editor or an 'open with' prompt — a browser viewer is a quicker way to read it.
Reading Note-App Exports
Obsidian, Bear, Joplin and similar note tools store notes as Markdown and can export them as .md files. Those exports often include front-matter, callouts or app-specific syntax that a generic viewer may not style, but the core content — headings, lists, links, code — renders correctly, which is usually enough for reading or reusing the text.