Online Markdown Viewer with Mermaid — Live Preview
Mark Maid Viewer is a free online markdown viewer and markdown reader online with a live markdown preview tool built in. Use it as a markdown visualizer online for markdown with mermaid — edit, preview side-by-side, and render Mermaid.js diagrams in your browser. No install required.
What We Offer
- Live Markdown Editor — Write and preview Markdown side-by-side with a draggable split view. Open .md files in Chrome, Firefox, or Edge with no extension.
- Mermaid Diagram Support — Sequence diagrams, flowcharts, ER diagrams, and more render automatically from Mermaid.js code blocks.
- GitHub Flavored Markdown — Tables, task lists, and GFM extensions render in the preview.
- Magnified Diagram Viewer — Click any diagram to open a full-screen view with zoom, pan, and keyboard shortcuts.
- Dark & Light Modes — Markdown reader with dark mode and a warm light theme, switchable in one click.
Open the editor on Mark Maid Viewer at www.markmaid.com — free, no install required.
Frequently Asked Questions
What is markdown with mermaid?
Markdown with mermaid combines plain-text markdown with Mermaid.js diagram blocks. You write ```mermaid code fences in your .md file and the viewer renders flowcharts, sequence diagrams, and ER diagrams live — ideal for technical docs and architecture notes.
Does this support a markdown viewer with Mermaid.js?
Yes. Mark Maid Viewer is a markdown viewer with Mermaid.js support. Diagrams in mermaid code blocks render automatically in the preview pane and can be opened full-screen with zoom and pan.
How do I render mermaid diagrams in markdown?
Add a fenced code block with the mermaid language tag in your markdown file. The live preview updates as you type. Use the editor above to try it — no setup required.
Is this a free online markdown viewer?
Yes. Mark Maid Viewer is a free online markdown viewer and markdown reader online. Open the site in any modern browser, paste or type markdown, or use Open File to load a local .md file.
How is an online markdown viewer different from a desktop app?
An online markdown viewer runs in your browser with nothing to install — useful when you need a quick live markdown preview tool on any device. Desktop apps like lightweight md file viewers are better for offline workflows; Mark Maid complements them for instant browser preview.
Does it support GitHub Flavored Markdown (GFM)?
Yes. This is a GitHub Flavored Markdown viewer online — tables, task lists, strikethrough, and other GFM extensions render in the preview alongside standard markdown syntax.
How do I open an md file in Chrome without an extension?
Visit Mark Maid Viewer in Chrome and click Open File to select a .md file from your computer. No Chrome markdown viewer extension is required — it works the same way in Firefox and Edge.
Can I use this as a markdown viewer in Firefox or Edge?
Yes. Mark Maid Viewer works as a Firefox markdown viewer and in Microsoft Edge. It is a browser-based markdown visualizer online — no plugin or extension needed.
VS Code markdown preview shortcut not working — can I preview online instead?
If the VS Code markdown preview shortcut (Ctrl+Shift+V / Cmd+Shift+V) is not working, paste your content into Mark Maid Viewer for an instant live preview. It is a handy fallback when IDE preview fails or you are on a machine without VS Code.
IntelliJ markdown preview not working — what are my options?
When IntelliJ markdown preview is not working, check plugin settings or try Mark Maid Viewer in your browser: copy markdown into the editor or open the .md file with Open File for immediate preview with Mermaid support.
Is there an online alternative to a lightweight md file viewer desktop app?
Yes. Mark Maid Viewer is a free online alternative when you need to read or preview markdown without installing a desktop reader on Mac, Windows, or Linux. For heavy offline editing, a native app may still be preferable.
Does this replace a Linux markdown CLI viewer like glow?
No. CLI tools like glow are excellent for terminal-based reading on Linux. Mark Maid Viewer is a browser markdown reader online — best for quick visual preview, Mermaid diagrams, and sharing with colleagues who do not use the terminal.