About Portable Markdown
One file. Goes everywhere.
What it is
Portable Markdown is a single-file-first Markdown toolkit. One .mdx document embeds text, images, attachments and Mermaid diagrams into a single file as Base64 — no external dependencies, trivially shareable, backup-friendly and git-ready.
Three ways to use it
| Mode | Description |
|---|---|
| Static Web Editor | Pure client-side, no login, data never leaves your browser. |
| Cloud Editor | Google sign-in, documents auto-save to the cloud. |
| Desktop Apps | Native apps for Windows / macOS / Linux, fully offline. |
Privacy
The static web editor never uploads your data; the desktop apps work fully offline; the cloud editor only saves your documents after Google sign-in. You always choose the mode that best fits your privacy needs.
Built on
Built on Cloudflare Workers + Hono, with D1 for metadata and R2 for content, and Better Auth (Google / GitHub) for auth. Rendering uses marked + DOMPurify + highlight.js + mermaid.