How to open a .md file
Every device can already open one — the question is whether you want to read the source or the rendered document.
Convert Markdown to PDF
Markdown source
You almost certainly already have something that opens it
A .md file is plain text, so every operating system ships with software that can open it. The reason it feels difficult is that double-clicking often does nothing useful: the extension is not registered to any application, so the system asks what to use rather than just opening it.
There are two different things you might mean by opening it. Reading the source shows you the raw characters, hashes and asterisks included — any text editor does that. Reading it rendered shows headings as headings and bold as bold, which needs software that understands Markdown, or a conversion to a format your software already renders.
If you were sent a .md file and simply need to read it properly once, converting it is usually faster than installing anything. The converter above turns it into a PDF you can open with a double-click, and nothing is uploaded in the process.
How to open a .md file on any device
To read it right now
Drop the file onto the converter above and choose HTML or PDF. It renders in your browser without installing anything.
To read the source
Open it with any text editor — Notepad, TextEdit, or the editor built into your file manager.
To edit it regularly
Install a Markdown editor. VS Code, Obsidian, and Typora all render as you type.
Open MD file, view .md, read a Markdown file — what each means
People search all three when they hit the same wall: a file arrived and double-clicking it did nothing. The fix depends on what you need. To read it once, convert it. To read it often, install an editor that renders Markdown. To edit it, any text editor will do — the format has no special requirements.
Questions
Why won't my .md file open when I double-click it?
Because no application is registered to the .md extension on your system, so it does not know what to launch. The file is fine. Right-click and choose Open with, and pick any text editor, or convert it to PDF to read it rendered.
How do I open a .md file on my phone?
Most file managers on Android and the Files app on iPhone will open it as text. To see it rendered rather than as source, use this converter in your mobile browser — it works the same on a phone as on a desktop.
Can I open a .md file in Word?
Word will open it, but it shows the raw source with all the hashes and asterisks visible rather than rendering the formatting. Converting to .docx first gives you a properly formatted Word document with real headings and styles.
How do I see a .md file rendered rather than as source?
Convert it to HTML or PDF, view it on GitHub if it lives in a repository, or open it in an editor with preview support such as VS Code, Obsidian, or Typora.
Is there a way to open one without installing anything?
Yes. The converter on this page runs in your browser — drop the file in and download it as PDF or HTML. Nothing is installed and nothing is uploaded.