md

A markdown editor that doesn't suck. Side-by-side, source-mapped scroll sync, edit local files in place.

tool · 2026 · no public repo

Solid.js · Vite · TypeScript · CodeMirror 6 · Unified · Remark · Rehype · KaTeX · Shiki · Firebase Hosting

markdown-lives.web.app

Side-by-side editor + preview with true bidirectional scroll sync — mapped to source lines, not percentages. Frontmatter-driven templates, KaTeX math, Shiki syntax highlighting, GFM tables/footnotes, Cmd-K palette, and File System Access for editing local files in place.

md editor in split mode — raw markdown on the left (frontmatter, headings, lists, math, fenced code) and rendered preview on the right with serif headings and KaTeX math. Status bar shows 111 words, template: default, mode: split. — Split mode. Source on the left, rendered on the right. Bidirectional scroll sync keeps them in step.

md editor in preview-only mode rendering the welcome document with a Recipe template applied — serif title, bullet list of Cmd-key shortcuts, a KaTeX equation, code block. — Preview-only mode. The frontmatter swaps the entire preview style — recipe, RFC, resume, blog, or default.

Command palette (Cmd-K) open over the md editor showing: New file, Import files from disk, Format tables, Toggle sidebar, Show notifications, View: Edit only/Split/Preview only, and Template: Default/Blog/RFC/Resume/Recipe. — Cmd-K palette. New file, import, view toggles, every template — all keyboard-reachable.

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Most markdown editors do one job well — write or preview, rarely both. md does both, side by side, with true bidirectional scroll sync that maps cursor lines to rendered blocks (not the lazy percentage-based version everyone ships).

Frontmatter-driven templates. Add template: rfc to your YAML frontmatter and the preview restyles as an RFC. template: resume and the page reads like a CV. Each template is a scoped CSS overlay — drop your own in to add one.

Edit local files in place. In Chromium browsers, Open and Save use the File System Access API — you're editing the actual file on disk, not uploading a copy. Safari and Firefox fall back to a download.

Built because: Obsidian is too much, IA Writer is too closed, VS Code's preview is WYSIWYG-adjacent, and almost every web markdown editor smushes scroll positions instead of mapping source-to-render properly.