Read & write Markdown, two ways.
Octopus Ink is a free, open-source app that opens your local .md files in two lenses: a clean rendered Visual view and the Raw source. Edit in either, and your changes stay in sync. It runs entirely on your device, so nothing is ever uploaded.
Type & Voice
We pair a serif display face for headlines with a clean grotesque for body copy. Keep line length comfortable and let the page breathe.
Principles
- Generous whitespace over density
- One accent color, used sparingly
- Hierarchy through size, not decoration
Good type is invisible; it simply lets the words speak.
# Type & Voice The typographic system for the new brand. We pair a **serif display** face for headlines with a clean grotesque for body copy. Keep line length comfortable and let the page breathe. ## Principles - Generous whitespace over density - One accent color, used `sparingly` - Hierarchy through size, not decoration > Good type is invisible; it simply lets the > words speak.
A calm home for your Markdown.
Built for people who keep their notes, docs, and drafts as local Markdown files, and want a beautiful way to read and edit them.
Always in sync
Flip between the rendered Visual page and the Raw Markdown source. Edit in either, and changes flow both ways, so you write however you prefer.
Yours, and private
Your files are read, edited, and saved entirely on your machine. No server, no account, no uploads, ever. What you write stays yours.
Convert to Markdown
Drop in a Word .docx or an .html file and Octopus Ink converts it to clean Markdown as a new copy, so your originals are never touched.
A real writing toolbar
Headings, bold, italic, code, lists, task lists, quotes, links, text color, find-in-document, and a light or dark page, all a click away.
Questions, answered.
Do I need to create an account or pay?
No. Octopus Ink is free and open source, with no account and no sign-up. Open it and start reading or writing.
Where are my files stored?
On your own device, full stop. The app reads and saves your local files directly in your browser, and nothing is uploaded to a server or tracked.
What's the difference between the browser and desktop versions?
The desktop build is paused until Apple Developer ID signing and notarization are ready. For now, use the browser version in Chrome or Edge; it can open files and folders and save them back to disk.
What can I open and import?
You can open .md, .markdown, .mdx, and .txt files directly. Import & convert also turns .docx and .html into Markdown. Complex Word formatting may simplify during conversion.
Is it really open source?
Yes. The source is on GitHub. You're welcome to read it, build it yourself, or contribute. A little credit or a link back to OctoSignal Lab is always appreciated.
Open your first document.
No setup, no account. Just your Markdown, two ways.