What Is a Markdown Editor?
A Markdown editor is a tool that lets you write and format plain text using lightweight markup symbols — like # for headings or **bold** for emphasis — while showing a live or rendered preview of the result.
Popular Markdown Editors
Markdown editors range from lightweight browser tools to full desktop knowledge bases. Here's how some of the commonly recommended ones compare:
HermesMarkdown
Local-first, runs entirely in your browserNo accounts, no cloud uploads — reads and writes files straight to disk. WikiLinks, spreadsheet-style tables with formulas, split panes, and optional bring-your-own-key AI.
Obsidian
Desktop knowledge base with pluginsVault-based note-taking app with a large plugin ecosystem and graph view.
Mark Text
Open-source desktop editorFree, open-source editor with real-time preview for Windows, macOS, and Linux.
Zettlr
Academic and research-orientedBuilt-in citation support and Zettelkasten-style linking for researchers.
Dillinger
Browser-based, cloud-connectedOnline editor with import/export to Dropbox, GitHub, and Google Drive.
Key Features
Not every Markdown editor needs every feature, but these are the ones worth checking for before you commit to one:
Live or side-by-side preview
See the rendered output next to (or instead of) the raw Markdown as you type.
Local-first file access
Reads and writes files directly to your device's disk with no account or upload required.
WikiLinks and backlinks
[[Double-bracket]] links between notes so you can build a connected knowledge base.
Syntax highlighting
Headings, code fences, and emphasis are visually distinct from plain text as you write.
Keyboard-first shortcuts
Formatting, navigation, and file actions available without leaving the keyboard.
Export options
Turning a note into HTML, PDF, or a shareable file without a separate conversion tool.
Where HermesMarkdown fits in
HermesMarkdown is a local-first Markdown editor that runs entirely in your browser. It reads and writes files directly to your device's disk through the File System Access API, so there's no account and no cloud upload. Optional GitHub-backed vaults and bring-your-own-key AI are the only features that talk to a server.
It supports split panes for working on several notes at once, WikiLinks for connecting notes, tables you edit like a spreadsheet (with formulas), and a vault-wide tasks view. Because notes stay plain Markdown, AI coding tools can read the vault directly.
FAQ
What is a Markdown editor?
A Markdown editor is a tool that lets you write and format plain text using lightweight markup symbols while showing a live or rendered preview.
What are the most popular Markdown editors?
Popular Markdown editors include HermesMarkdown, Obsidian, Mark Text, Zettlr, and Dillinger.
What features should a Markdown editor have?
A live or side-by-side preview, syntax highlighting, WikiLinks, keyboard shortcuts, offline/local file support, and export to formats like HTML or PDF.
Do Markdown editors require an account or cloud storage?
Not always. Local-first editors like HermesMarkdown read and write files directly to your device's disk, so no account or cloud upload is required.