Markdown Editor

What Is a Markdown Editor?

A Markdown editor is a tool for writing and previewing content in Markdown syntax — the lightweight markup language used by developers, writers, and technical teams worldwide. Our free online Markdown editor goes far beyond basic editors like Dillinger or StackEdit by combining 12 professional features in a single, clean interface: live split-pane preview, syntax highlighting, Mermaid diagrams, LaTeX math, focus mode, PDF export, slide presentations, and more — all running 100% in your browser with no sign-up required.

How to Use Our Markdown Editor

Type or paste Markdown into the left editor pane. The right pane shows a live preview that updates in real time as you type, with synchronized scrolling. Use the toolbar buttons or keyboard shortcuts (Ctrl+B for bold, Ctrl+I for italic, Ctrl+K for links) for quick formatting. Drag the vertical divider to resize panels. When finished, export as PDF, download as .md file, copy rendered HTML, or export as a standalone HTML file with embedded styles.

Key Features

• Live split-pane preview — real-time rendering with draggable resizable divider and scroll sync
• Syntax highlighting — 40+ programming languages in fenced code blocks via highlight.js
• Mermaid diagram rendering — flowcharts, sequence diagrams, Gantt charts rendered as SVG
• LaTeX math formulas — inline ($E=mc^2$) and block ($$\sum x$$) math via KaTeX
• Distraction-free focus mode — zen writing with minimal UI, light/dark theme toggle
• PDF export — styled print view preserving formatting, code blocks, and tables
• Standalone HTML export — download a complete .html file with embedded CSS
• Slide presentation mode — split Markdown by --- into slides, fullscreen navigation with arrow keys
• Find and replace — search with match count, replace/replace all, case sensitive and regex toggles
• Multiple themes and fonts — 5 editor fonts (JetBrains Mono, Fira Code, etc.) and 4 preview themes
• Image paste and drag-drop — paste images from clipboard or drag-drop files, auto-converted to base64
• Markdown cheatsheet sidebar — 19 syntax examples, click any item to insert at cursor
• Keyboard shortcuts — Ctrl+B, Ctrl+I, Ctrl+K, Ctrl+1/2/3, Ctrl+S, and more
• Table of Contents generator — auto-generated from headings, one-click insert
• Auto-save — content saved to localStorage, persists across browser sessions
• Share via URL — encode small documents in a shareable link
• GitHub-Flavored Markdown — tables, task lists, strikethrough, autolinks, emoji shortcodes

Why Choose Our Markdown Editor?

Unlike Dillinger (no diagrams, no math, no focus mode), StackEdit (requires Google/Dropbox sign-in for sync), and HackMD (paid team features), our free Markdown editor online packs every professional feature into a single page with zero sign-up. Mermaid diagrams render natively — no plugins needed. LaTeX math works out of the box. The distraction-free focus mode rivals Typora. Slide presentations turn your Markdown into a slideshow instantly. And everything runs 100% client-side — your content never touches our servers.

Common Use Cases

• Developers — write README files, API docs, and GitHub issues with live preview and diagram support
• Technical writers — draft documentation with Mermaid flowcharts, code blocks, and PDF export
• Bloggers — write posts for Hugo, Jekyll, Gatsby, Next.js, and other static site generators
• Students and academics — write papers with LaTeX math formulas and export as PDF
• Presenters — create quick technical presentations from Markdown using slide mode
• Content teams — draft, preview, and share Markdown content without installing any software

Tips and Best Practices

Use keyboard shortcuts to speed up your workflow — Ctrl+B for bold, Ctrl+I for italic, Ctrl+K for links. Press Ctrl+1/2/3 for heading levels. Use the focus mode for long writing sessions to eliminate distractions. For Mermaid diagrams, start a code block with ```mermaid and write your diagram syntax. For math formulas, wrap inline math in single dollar signs and block math in double dollar signs. Use the draggable divider to give more space to the editor or preview as needed. The cheatsheet sidebar is great for learning Markdown syntax — click any item to insert it at your cursor position. For presentations, separate slides with --- (horizontal rules) and click the Slides button for fullscreen navigation.