Markdown Memo

A simple, single-file Markdown editor for the browser

Browser-based Markdown editor with split-pane live preview, formatting toolbar, night mode, and download as .md / .txt / .html.
No build step. One file. Works offline.

→ Try it live

Night mode

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Features

• Live preview — Split-pane or full preview mode, updates as you type
• Formatting toolbar — Headings, bold, italic, lists, to-do, code blocks, tables, and more
• Interactive to-do — Check off tasks directly in the preview
• Night mode — Toggle between light and dark theme, follows your system by default
• Download — Export as .md, .txt, or styled .html
• Auto-save — Content persists in the browser via localStorage
• Fullscreen mode — Distraction-free writing (F11 or button)
• Responsive — Works on desktop, tablet, and mobile
• Offline — No network needed; nothing you write ever leaves your device

Usage

No install required. Just open index.html in any modern browser.

open index.html

Or serve locally:

npx serve .

Keyboard Shortcuts

Key	Action
Tab	Indent (2 spaces)
F11	Toggle fullscreen
Esc	Exit fullscreen

License

MIT — see LICENSE.

Bundles marked (MIT) so the app runs offline; see NOTICE.