Are my documents saved automatically?

Yes. Every document is autosaved to your browser's localStorage within 300 ms of each keystroke. Documents persist between page refreshes and browser sessions. However, localStorage is device-specific - your documents are not synced across devices. Export important documents to keep a backup.

How many documents can I create?

There is no built-in limit on the number of documents. The practical limit is your browser's localStorage quota, which is typically 5–10 MB. The editor warns you if usage approaches 4 MB. Export and delete old documents when space runs low.

What Markdown syntax is supported?

GitHub Flavored Markdown (GFM) - a superset of CommonMark. This includes headings, bold, italic, strikethrough, inline code, fenced code blocks, links, images, blockquotes, ordered and unordered lists, task lists (checkboxes), tables, and horizontal rules.

Is the HTML export safe to use on a website?

Yes. All HTML output is sanitized with DOMPurify before being rendered in the preview or exported. Dangerous elements such as tags and javascript: links are stripped automatically.

Can I import an existing Markdown file?

Yes. Click "Import .md" and select a .md or .txt file from your computer. The file content loads into the current document. Importing overwrites the current document content, so export or create a new tab first if you want to keep the existing content.

How do I rename a document?

Double-click the document tab label to enter edit mode. Type the new name and press Enter (or click away) to save.

Markdown Editor with Live Preview

How to use the Markdown Editor

Type or paste Markdown in the editor pane on the left. The preview on the right updates in real time. Use the toolbar to insert common formatting (bold, italic, headings, links, lists, tables, and more) without memorizing any syntax. Press Ctrl+B for bold and Ctrl+I for italic directly from the keyboard.

Create multiple documents using the + button in the tab bar. Each document autosaves to your browser's localStorage within 300 ms of each keystroke. Documents survive page refreshes and browser restarts. Double-click a tab label to rename the document.

Markdown syntax reference

Syntax	Result
`# Heading 1`	Large heading (H1)
`## Heading 2`	Section heading (H2–H6)
`bold`	bold
`italic`	italic
`~~strike~~`	~~strike~~
`code`	`inline code`
`[text](url)`	Hyperlink
`![alt](url)`	Image
`> text`	Blockquote
`- item`	Unordered list
`1. item`	Ordered list
`- [ ] task`	Task list (unchecked)
`- [x] task`	Task list (checked)
`---`	Horizontal rule
Pipe-separated columns	Table (see toolbar)

Markdown vs HTML

Markdown is a lightweight syntax that converts to HTML. It was created by John Gruber in 2004 with the goal of being readable as plain text while still being easily converted to formatted HTML. This editor uses GitHub Flavored Markdown (GFM), a widely adopted superset of the original specification that adds tables, task lists, and strikethrough.

HTML gives you more control (every CSS property and ARIA attribute is available), but it is verbose and error-prone to write by hand. For content that does not require advanced layout, Markdown is usually faster to write and easier to maintain. This tool lets you export to both formats: download the raw .md source or the sanitized .html page.

Browser storage and privacy

All documents are stored in localStorage, a browser-based key/value store that never leaves your device. No document text is transmitted to any server. The editor uses namespaced keys (mde:doc:<id>) so it does not interfere with other site data. The typical localStorage quota is 5–10 MB per origin; the editor warns you when usage approaches 4 MB.

Because localStorage is device-specific, documents created on your laptop will not appear on your phone. Export important documents as .md files to keep portable backups.

Keyboard shortcuts

Action	Windows / Linux	macOS
Bold	Ctrl+B	⌘B
Italic	Ctrl+I	⌘I
Save / download	Ctrl+S	⌘S
Undo	Ctrl+Z	⌘Z
Redo	Ctrl+Y or Ctrl+Shift+Z	⌘Shift+Z
Find	Ctrl+F	⌘F

Additional toolbar buttons insert headings, links, images, code blocks, blockquotes, and horizontal rules. Check the toolbar for the full set.

Export formats

.md (Markdown source): the raw plain-text file. Use this to version-control your document in Git, share with editors who use their own renderer, or open in any text editor.
.html: the rendered and sanitized HTML output. Use this to embed the content in a webpage, email, or CMS that accepts HTML.

Markdown flavors

This editor uses GitHub Flavored Markdown (GFM), which extends CommonMark (the standard specification) with:

Tables: pipe-separated syntax with alignment colons.
Task lists: - [ ] unchecked / - [x] checked.
Strikethrough: ~~deleted~~.
Autolinks: bare URLs become clickable links.

If you paste this Markdown into a platform that uses CommonMark (without GFM extensions), tables and task lists will not render - they'll appear as raw pipe characters and brackets. Footnotes and definition lists are not supported in GFM; use HTML for those elements.