A markdown viewer that just works
This free md viewer renders GitHub-flavored Markdown exactly the way it was meant to look: headings become headings, tables become tables, task lists get real checkboxes, and code blocks get syntax highlighting. It also renders Mermaid diagrams and LaTeX formulas, which plain viewers usually skip — important now that ChatGPT and Claude routinely include both in their output.
Mermaid diagrams in your .md files
Every ```mermaid block becomes a real diagram with its own toolbar: view or copy the code, download it as PNG or SVG, or run the syntax fixer when an AI-generated diagram refuses to render. A document with two or more diagrams gets an Export all (ZIP) button at the top. For working on a single diagram, use the Mermaid viewer; to repair broken code, the Mermaid syntax fixer; to pull every diagram out of a long document, extract Mermaid from Markdown.
Why an online viewer?
If you need step-by-step device instructions, see how to open an MD file on Windows, Mac, iPhone, and Android. Windows and macOS have no built-in app associated with the .md extension, so double-clicking usually opens a wall of raw text — or nothing at all. Installing a code editor just to read one file is overkill. An md viewer online means: open the browser, drop the file, done. Nothing to install, nothing to configure, works the same on desktop and phone.
Private by design
Unlike many "online viewers", this page never uploads your file. All parsing happens locally in your browser with JavaScript. Close the tab and nothing remains.