Hashlite

Free online Markdown editor

Write Markdown. See it live.

Start writing
The Hashlite editor: a sidebar with folders, Markdown source on the left and the live preview on the right, showing highlighted code, a rendered math formula and a flowchart diagram

What is Hashlite?

Hashlite is a free online Markdown editor with live preview. It saves as you type, handles math and diagrams, and exports to HTML or PDF.

Features

  • Live preview

    Split view with synced scrolling as you type.

  • Autosave and history

    Saved as you type. Restore any earlier version.

  • Folders and search

    Drag and drop folders, full-text search, trash.

  • GitHub-flavoured Markdown

    Tables, task lists, footnotes and callouts.

  • Math, diagrams, code

    KaTeX, Mermaid and syntax highlighting.

  • Export and share

    .md, HTML, PDF or .zip, and read-only links.

Frequently asked questions

Is Hashlite free?

Yes. Hashlite is free, has no ads and is open source.

Do I need an account?

Yes, you sign up with an email address and a password. The account keeps your documents in sync on every device.

Where are my documents stored?

In your account, stored with Supabase in the EU and saved as you type, with a local draft in your browser as a backup. Version history lets you restore earlier versions.

Can I export to PDF or HTML?

Yes. Download a document as .md or standalone HTML, print it or save it as PDF, or download everything as a .zip.

Does it support math and diagrams?

Yes. LaTeX math between $ or $$ is rendered with KaTeX, and mermaid code blocks are drawn as diagrams.

Can I use it offline?

Partly. If your connection drops, your edits are kept as a local draft and saved when you are back online.

Can I self-host it?

Yes. Hashlite is open source: a static site plus your own Supabase project for accounts and storage.

Is my data private?

Your documents are private unless you create a read-only share link. Hashlite sets no cookies and has no tracking, analytics or ads.