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Markdown Editor

Free online Markdown editor with live preview. Write, format, and preview Markdown instantly — with Mermaid diagrams, table formatting, synced scrolling, and .md download.

Markdown
Press Tab to indent and Shift plus Tab to outdent. Press Escape and then Tab to move focus out of the editor.

Frequently Asked Questions

Is this Markdown editor free to use?
Yes, it is completely free with no signup, registration, or restrictions required.
Are my documents saved or uploaded to a server?
No. The editor runs entirely in your browser. Your latest editor draft can be saved locally in your browser storage, but nothing you type or edit is uploaded to any server.
Does the Markdown editor support Mermaid diagrams?
Yes. Add a fenced Mermaid code block using ```mermaid, and the live preview will render the diagram in the browser.
Can I sync the Markdown editor and preview while scrolling?
Yes. On desktop, turn on Sync Scroll to keep the source editor and rendered preview aligned while reviewing longer Markdown documents.
Does the formatter change my text content?
No, the built-in formatter only normalizes whitespace, formats delimiters (like list markers), and aligns markdown tables. Your actual text remains unchanged.

Free online Markdown editor and formatter

Writing and editing Markdown is the modern standard for web content, documentation, README files, technical notes, and plain-text publishing. Our free online Markdown editor with live preview opens directly into a split-pane writing workspace, so you can start typing or paste existing Markdown without passing through an upload screen. The rendered preview updates as you edit, making it easy to check headings, links, lists, code blocks, images, blockquotes, task lists, and tables before saving your work.

Why use our Markdown Editor?

  • Live Preview: See your formatted document render side-by-side in real-time as you type.
  • Mermaid Preview: Render Mermaid diagrams from fenced ```mermaid code blocks directly inside your Markdown preview.
  • Local Draft Autosave: Restore your last editor draft from this browser without sending your Markdown to a server.
  • Resizable Split Pane: Drag the desktop divider to give more room to the Markdown source or the rendered preview.
  • Sync Scroll: Keep long Markdown documents and their preview aligned while reviewing sections.
  • Built-in Formatter: Instantly clean up spacing, normalize list styles, and perfectly align messy Markdown tables with one click.
  • Formatting Shortcuts: Use keyboard shortcuts (Ctrl+B, Ctrl+I, Ctrl+H, Ctrl+K) or the toolbar to speed up your writing.
  • 100% Client-Side: Your writing never leaves your computer. All rendering and formatting happen locally in your browser for maximum privacy.

Markdown live preview for docs and AI workflows

The editor is built for practical Markdown cleanup: drafting documentation, preparing GitHub README content, fixing AI-generated Markdown tables, checking Mermaid diagrams before publishing, and saving clean .md files. Because the editor supports local draft restore, you can return to unfinished notes in the same browser, while still keeping TheMarkdowner's privacy-first browser-based workflow.

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