Markdown Editor
A fast markdown editor with live preview, multiple documents organized
into workspaces, real-time multi-user collaboration (including
Google-Docs-style suggesting), GitHub sign-in with Gist and whole-repo
sync, and export to .md, .html, .pdf, and .txt. The client is
TypeScript + Svelte 5, built with Vite; the backend is a single
Cloudflare Worker (also TypeScript). Documents are saved locally in the
browser (localStorage) until you share their workspace, at which point
its live state moves into a Durable Object.
Features
Editing
- Live split-pane preview (or editor-only / preview-only), synced
scrolling between the two, with Focus Mode (paragraph dimming,
typewriter scrolling, hidden chrome)
- CodeMirror 6 editor with a formatting toolbar + shortcuts, Vim/Emacs
keybindings, GitHub-flavored markdown (tables, task lists,
strikethrough, autolinks), MultiMarkdown definition lists and
superscript/subscript, Mermaid diagrams (with a dedicated diagram
editor), KaTeX math, footnotes, and citations/bibliography
- Command palette (
Ctrl/Cmd+Shift+P) and /-triggered slash commands
for inserting any block-level element
- Find and replace (
Ctrl/Cmd+F / Ctrl/Cmd+H) with case/whole-word/
regex toggles
[[Wikilinks]] between documents with autocomplete, backlinks, and a
Markdown Compatibility Checker that flags app-only or flavor-specific
syntax before you export it elsewhere
Organization
- Documents grouped into named workspaces — switch, create, rename,
or delete from a sidebar switcher; move a document between workspaces
- Automatic version history for every document (local and shared alike),
grouped into collapsible editing sessions, with non-destructive restore
and a GitHub-style diff between any two versions
- Document Info panel — metadata, citations, linked repo/Gist, and the
compatibility checker, all editable from one place
Collaboration
- Real-time multi-user editing — share a whole workspace and every
document inside it syncs live to collaborators at once, with presence
avatars and remote cursors/selections
- Suggestion-mode collaboration (Google Docs parity) — the reviewer
role proposes tracked insert/delete suggestions instead of editing
directly; the document's editor accepts, rejects, or the reviewer
withdraws them, and each suggestion has its own reply thread. Viewer
role is Preview-only
- Threaded, resolvable comments anchored to text — in a right-margin rail
next to the line they refer to, syncing live over the same connection as
the document, with an unresolved-count badge
- Opening a share link previews the workspace first instead of always
committing it to your sidebar — "Keep this workspace" if you want it
GitHub integration
- Sign in with GitHub — publish/update the current document as a
Gist (images pushed as real git blobs, not inlined as base64, with a
choice of Public/Secret) or open one of your own Gists
- Whole-repo sync — link a workspace to a GitHub repo and every
.md file becomes a document; push local changes as one commit or
pull the latest, with per-file conflict detection
- Version History shows a repo-linked document's real commit history
alongside local snapshots
Everything else
- Local images — paste, drag-drop, or pick from already-uploaded
images; embedded as a base64 data URI locally (2 MB max per image),
rewritten to a real hosted image when publishing to a Gist or repo;
replace an image's underlying file in place from its own menu
- Import existing
.md/.txt files; export as Markdown, standalone
HTML, PDF, or plain text; native print support
- Light/dark theme, a URL for every document (deep links, browser
back/forward), and a clean empty state when none exist yet
Quick start
npm install
npm run build
npm run dev
See CONTRIBUTING.md for full local-dev setup,
including optional GitHub OAuth for sign-in/Gist/Share.
Documentation
License
MIT
