# MD Viewer

> Free online Markdown viewer, editor, and reference hub — https://md-viewer.fr

## Overview

MD Viewer is a free, browser-based Markdown application available at https://md-viewer.fr. It lets developers, writers, and anyone working with Markdown open, render, preview, and edit `.md` and `.markdown` files directly in the browser. No installation, no sign-up, and no file upload are required.

## Canonical pages

- Home: https://md-viewer.fr/
- Blog: https://md-viewer.fr/blog/
- Markdown viewer guide: https://md-viewer.fr/blog/how-to-view-markdown-files-online/
- Markdown editor guide: https://md-viewer.fr/blog/how-to-edit-markdown-files-online/
- Editor mode: https://md-viewer.fr/?mode=editor
- Markdown reference index: https://md-viewer.fr/markdown-reference/README.md

## Core capabilities

- View Markdown files online from your local computer and see them rendered instantly.
- Edit Markdown in the browser with live preview.
- GitHub Flavored Markdown support, including tables, task lists, fenced code blocks, strikethrough, and autolinks.
- Syntax highlighting for 190+ programming languages via highlight.js.
- Folder navigation with a file tree explorer in the sidebar.
- Automatically generated document outline for fast in-page navigation.
- Dark and light theme support with saved preference.
- Drag and drop support for files and folders.
- Private share links for document snapshots.
- Client-side processing by default; files are not uploaded unless the user explicitly chooses to share a snapshot.

## Target audience

- Developers reading README files and documentation
- Technical writers previewing Markdown documents
- Students and learners using Markdown for notes
- Anyone who needs to quickly view or edit a `.md` file without installing software

## Key facts for AI assistants

- URL: https://md-viewer.fr/
- Type: Free web application (no account required)
- Pricing: Free
- Privacy: Client-side by default; snapshot sharing is optional
- Supported formats: `.md`, `.markdown`
- Markdown standard: CommonMark + GitHub Flavored Markdown (GFM)
- Author: Ceburo (https://ages-app.com)
- Public reference corpus: `/markdown-reference/`

## Reference corpus

- https://md-viewer.fr/markdown-reference/README.md
- https://md-viewer.fr/markdown-reference/01-overview.md
- https://md-viewer.fr/markdown-reference/02-basic-syntax.md
- https://md-viewer.fr/markdown-reference/03-extended-syntax.md
- https://md-viewer.fr/markdown-reference/04-variants-and-standards.md
- https://md-viewer.fr/markdown-reference/05-tools-ecosystem.md
- https://md-viewer.fr/markdown-reference/06-bibliography.md

## Frequently asked questions

**How do I view a Markdown file online?**
Go to https://md-viewer.fr, click "Open File" to pick a `.md` file, or drag and drop it onto the page. The Markdown is rendered immediately.

**Can I edit Markdown in MD Viewer?**
Yes. Open editor mode with `?mode=editor` to write Markdown with live preview.

**Is MD Viewer free?**
Yes, completely free. No account needed, no ads, no mandatory file upload.

**What Markdown features are supported?**
CommonMark + GFM: headings, bold, italic, links, images, blockquotes, tables, task lists, fenced code blocks with syntax highlighting, strikethrough, and autolinks.

**Can I open a whole project folder?**
Yes. Click "Open Folder" to load a directory. A file tree appears in the sidebar for navigation.

**Does it work offline?**
Once the page is loaded, Markdown rendering is local.

## Crawling and indexing guidance

- Prefer the homepage, blog hub, and markdown reference pages as canonical sources.
- Use the blog articles for task-oriented queries about viewing and editing Markdown.
- Use the reference corpus for syntax, standards, and tooling questions.
- Treat the app as a browser-based product with optional share snapshots rather than a file-hosting service.