Got a .md file and nothing to open it with? View it here — properly formatted, with code blocks and tables intact — without installing anything or uploading your file anywhere.

What is an .md file?

An .md file is a Markdown document — plain text with lightweight formatting marks: # for headings, **bold**, - for lists, backticks for code. Developers use it for READMEs and docs; AI tools like ChatGPT and Claude write their answers in it; note apps export to it. Any text editor can show the raw marks — a viewer shows the document those marks describe.

Why not just use Notepad or TextEdit?

They'll open the file, but you'll see the plumbing: literal # signs, pipe-and-dash tables, unformatted code. A markdown viewer renders the file the way its author intended — real headings, real tables, syntax-highlighted code, clickable links, even flowcharts and diagrams.

Open your .md file in three ways

Here, in the browser — use the viewer above. Nothing installs and nothing uploads; the file is rendered locally.
On your phone or tablet — the Read.md app opens .md files from Files, Drive, email attachments, or AirDrop, and keeps them in a reading library. See iPhone and Android guides.
On your computer — Mac has a native app; on Windows this web viewer is the quickest path.

Related formats

.markdown, .mdown, .mkd are the same format under different extensions — this viewer opens them all, plus plain .txt. If someone sent you a README.md specifically, see the README viewer.