MDViewerSaved locally
Live previewGitHub Extended
Before first heading

Welcome to MD Viewer

Open a .md file to preview it in this browser. Switch to the editor when you want a live preview while you write.

A quick check

  • View a Markdown file
  • Preview GitHub-style content
  • Edit only if you need to
JobToolBest for
ViewMarkdown viewerReading a README or note
PreviewMarkdown previewChecking rendered output
EditMarkdown editorChanging the source

Code, math, and diagrams

export function preview(source: string) {
  return { source, uploaded: false };
}

Inline math stays crisp: E=mc2E = mc^2.

 Rendering diagram…

Ready when you are

Drop a Markdown file here, paste source, or start from this sample.

108 words1 min read
UTF-8LFGFM 0.29 + MD Viewer extensions v1

Markdown preview

Preview a Markdown file

Open a .md file and see GitHub-style Markdown immediately. This is the MD file viewer—switch to the editor when you need to write.

  1. 01

    Open a .md file

    Use Open, drag a Markdown file onto the page, or paste the source.

  2. 02

    Read the preview

    GitHub-style Markdown renders in place: headings, tables, code, math, and diagrams.

  3. 03

    Edit only if you need to

    Stay in the viewer to read, or open the Markdown editor for a live preview while you write.

MD file viewer

Open README files, notes, and docs without installing a desktop app.

GitHub-style preview

Tables, task lists, fenced code, math, and Mermaid diagrams render in place.

Nothing uploaded

The .md file is read in this browser. Use the editor only if you need to change it.

Questions

About this markdown preview

How do I view a Markdown file online?

Open the MD file viewer, choose Open, and pick a .md file from your device. You can also drag the file onto the page or paste Markdown. The preview renders in this browser.

What is Markdown preview?

Markdown preview turns source like # Heading and **bold** into formatted HTML. MD Viewer previews GitHub Flavored Markdown, including tables, task lists, code, math, and Mermaid diagrams.

Is this an MD file viewer or an editor?

This page is the viewer: it opens a file in preview so you can read it. Switch to the Markdown editor when you want to change the source with live preview.

Does the viewer upload my .md file?

No. The file is read locally. Refreshing this browser still has the draft; another device or Incognito window does not.