Online Markdown Editor
Mardna is a free online Markdown editor. Open a browser tab, start typing, and the finished page builds itself beside you. There is nothing to install and no account to create — the editor, the renderer and your document all live in the tab.
An editor that knows Markdown
The writing pane understands Markdown as you type, so the source stays readable on its own — headings, emphasis, links and fenced code are each distinguished, in the same palette as the page they render to.
The mechanical parts of writing Markdown are handled for you:
- Lists continue themselves. Press Enter inside a bullet, a numbered item or a task list and the next marker appears, already numbered. Press it on an empty item to close the list.
- Tables are navigable. Tab and ⇧ Tab move between cells and add a new row when you run off the end, so a table stays aligned while you fill it in.
- Pairs close around a selection. Brackets, quotes and fences wrap what you have selected instead of replacing it.
- Autocomplete where it earns its place — fenced-code languages after three backticks, emoji shortcodes after a colon, heading levels and link syntax.
- Paste an image and it is embedded. A screenshot from the clipboard becomes an inline image in the document rather than a broken file path.
- Find and replace with ⌘F, and full undo history with ⌘Z.
Your work saves itself, in your browser
Every change is written to your browser's own storage, throttled so that saving never competes with typing. Each tab keeps its own document, so two drafts open side by side do not overwrite one another.
A snapshot is taken every few minutes and the last twenty are browsable from the history panel (⌘⇧H), so an accidental select-all-and-type is recoverable. ⌘S forces a save immediately and confirms it; it never downloads anything.
Because none of this needs a server, the editor also works with the network off. Mardna can be installed to your dock or home screen, where it opens in its own window and keeps rendering, highlighting and exporting offline.
Keyboard shortcuts
Everything reachable by mouse has a key. On Windows and Linux, use Ctrl in place of ⌘.
| Shortcut | Action |
|---|---|
| ⌘K | Command palette — every action, searchable |
| ⌘\ | Split view on or off |
| ⌘⇧P | Switch between editing and preview |
| ⌘B ⌘I ⌘E | Bold, italic, inline code |
| ⌘⇧K | Wrap the selection in a link |
| ⌘P | Export to PDF |
| ⌘⇧E | Export menu — PDF, HTML or Markdown |
| ⌘⇧L | Dark mode |
| ⌘/ | The full list |
Open the files you already have
Drop a .md, .markdown or .txt file anywhere on the window and it opens; the file picker in the header does the same thing. The document title follows the first heading, so an exported file lands with a sensible name.
Your Markdown goes back out unchanged whenever you want it — the export menu offers the raw source alongside PDF and HTML.
Frequently asked questions
Do I need an account to use the Markdown editor?
No. There is no sign-up, no login and no paywall. Open the page and start writing.
Is my document uploaded to a server?
No. Parsing, highlighting, diagrams and autosave all run in your browser, and the document is stored in that browser’s own database. Nothing is transmitted anywhere.
Can I edit Markdown offline?
Yes. Once Mardna has loaded it keeps working without a connection — preview and export included — and it can be installed so that it opens in its own window.
Which Markdown syntax does the editor support?
GitHub Flavored Markdown: tables, task lists, strikethrough, footnotes, autolinks and fenced code, plus GitHub-style alerts, LaTeX math and Mermaid diagrams.
What happens if I close the tab by accident?
The document is restored when you reopen it, and the history panel keeps the last twenty snapshots in case you need to step further back.
Start writing
The editor opens with a sample document. Select all, paste your own Markdown over it, and you are working.