Free Online Markdown Viewer
View and render .md files directly in your browser — no install needed
Sometimes you need to view Markdown online without installing anything — you're on a shared machine, reviewing a colleague's file, or just want a quick look at a README. The MDViewer online viewer lets you drop any .md file into your browser and see it rendered instantly.
How It Works
- Open getmd.ma/viewer in any browser
- Drag and drop your
.mdfile onto the page — or click Choose File - Your file renders immediately with full formatting: headings, tables, code blocks, links, and images
The entire process happens in your browser. Your file is read locally by JavaScript — nothing is uploaded to a server. Your Markdown stays on your device.
What the Online Markdown Viewer Supports
- GitHub Flavored Markdown — tables, task lists, strikethrough, fenced code blocks
- Syntax highlighting — code blocks render with colors for 180+ languages (Python, JavaScript, Swift, SQL, and more)
- Mermaid diagrams — flowcharts, sequence diagrams, ER diagrams render as interactive SVGs. Click to zoom and pan
- Table of contents — a sidebar shows all headings with live scroll tracking, just like in the desktop app
- Light and dark mode — follows your system preference automatically
When to Use an Online Markdown Viewer
- Quick review — check how a README or doc looks before committing
- Shared computers — you can't install apps on a work machine or library computer
- Cross-platform — works on Windows, Linux, ChromeOS, and any device with a browser
- Sending to non-technical people — share the link, they drop the file, done
Online Markdown Viewers Compared
| Tool | Local Files | Privacy | GFM | Mermaid | Account Required |
|---|---|---|---|---|---|
| MDViewer Online | Yes (drag & drop) | 100% client-side | Full | Yes | No |
| GitHub Preview | No (repo only) | Server-rendered | Full | Yes | Yes |
| Dillinger | Yes (import) | Server-side | Partial | No | Optional |
| StackEdit | Yes (import) | Server-side | Partial | No | Optional |
| Copy to ChatGPT | Yes (paste) | Sent to server | Strips formatting | No | Yes |
Markdown Syntax the Online Viewer Renders
The online Markdown viewer handles everything you'd expect from a modern renderer — and a few things most tools miss:
| Element | Syntax | Supported |
|---|---|---|
| Headings | # H1 through ###### H6 | Yes |
| Bold / italic | **bold** / *italic* | Yes |
| Links & images | [text](url) /  | Yes |
| Code blocks | Fenced with ```lang | Yes, with syntax highlighting for 180+ languages |
| Tables | GFM pipe tables | Yes, with horizontal scroll for wide tables |
| Task lists | - [x] done | Yes |
| Strikethrough | ~~text~~ | Yes |
| Mermaid diagrams | ```mermaid | Yes, interactive SVGs with zoom |
| Math formulas | $...$ and $$...$$ | Yes, KaTeX rendering |
This covers the full GitHub Flavored Markdown spec plus Mermaid and KaTeX — the same rendering engine used in the MDViewer desktop app.
Privacy and Security
Most online Markdown tools upload your file to a server for processing. MDViewer's online viewer works differently:
- 100% client-side — your file is read by JavaScript's
FileReaderAPI and rendered in the browser. No network requests are made with your content. - No cookies or tracking on your files — the viewer doesn't store, log, or transmit file contents.
- Works offline — once the page loads, you can disconnect from the internet and still view files. Everything runs locally.
This makes it safe for viewing sensitive documentation, internal READMEs, or any Markdown file you wouldn't want leaving your machine.
Want More? Get the Desktop App
The online Markdown viewer covers viewing, but if you need editing, Git history, file tabs, or QuickLook preview in Finder, MDViewer for macOS has you covered. It's free, native, and launches instantly.
macOS app requires macOS 13.0 or later. Intel and Apple Silicon.
FAQ
Is the online Markdown viewer free?
Yes, completely free. No sign-up, no limits, no ads.
Is my file uploaded to a server?
No. The file is read locally by your browser using the JavaScript FileReader API. Nothing leaves your device.
Can I view Markdown online on my phone?
Yes. The viewer works on any device with a modern browser — iPhone, iPad, Android, Chromebook.
Does it support Mermaid diagrams?
Yes. Fenced code blocks with ```mermaid render as interactive diagrams with click-to-zoom.
Does the online viewer work offline?
Yes. Once the page has loaded, you can go offline and continue viewing Markdown files. All rendering happens in your browser.
What's the maximum file size?
There's no hard limit. The viewer handles typical documentation files (up to several MB) without issues. Very large auto-generated files may take a moment to render.
Can I use this instead of installing an app?
For occasional viewing, absolutely. If you work with Markdown daily and need editing, Git history, tabs, or Finder integration, the MDViewer desktop app is a better fit — and it's also free.