UFOZoo

Markdown Editor — Free Online Markdown to HTML Converter

Free online Markdown editor with live preview. Write Markdown, see rendered HTML instantly, export as HTML or .md. No signup, runs in your browser.

Features

  • ✓Live preview as you type — see the rendered HTML update instantly in the right panel
  • ✓Split-pane view — edit Markdown on the left, preview the result on the right side by side
  • ✓View mode toggle — switch between Edit only, Preview only, or Side-by-Side Split with one click
  • ✓Toolbar shortcuts — bold, italic, heading, link, image, list, and code block buttons for quick formatting
  • ✓Copy rendered HTML — copy the complete HTML output to clipboard with one click for use in websites or emails
  • ✓Save as .md or .html — save your work as a Markdown file or export the rendered HTML output
  • ✓Drag-and-drop .md file open — drop a Markdown file anywhere on the editor to load its content instantly
  • ✓Word, character, and line count — real-time statistics displayed in the status bar at the bottom
  • ✓GitHub Flavored Markdown support — tables, task lists, strikethrough, autolinks, and fenced code blocks with syntax highlighting
  • ✓Responsive design — side-by-side layout on desktop, stacked layout on mobile for comfortable editing
  • ✓Entirely client-side — all rendering uses the marked library in your browser, zero data uploaded to any server

How to Use

  1. 1Type or paste Markdown text into the left editor panel. The right panel shows the rendered preview in real time.
  2. 2Use the view mode buttons (Edit / Preview / Split) at the top to switch between editing only, preview only, or side-by-side layout.
  3. 3Click toolbar buttons (B, I, H, Link, Image, List, Code) to insert Markdown syntax at the cursor position.
  4. 4Drag and drop a .md file onto the editor to load its content, or click Open to browse and select a file.
  5. 5Click Copy HTML to copy the rendered HTML to your clipboard, or use Save to save as .md or .html file.
  6. 6Check the status bar at the bottom for real-time word count, character count, and line count.
  7. 7Use the wide/normal toggle to switch between full-width editing and a comfortable centered reading width.
  8. 8Explore the Examples dropdown to load pre-built Markdown snippets showing tables, task lists, code blocks, and more.
  9. 9Use keyboard shortcuts: Ctrl+B for bold, Ctrl+I for italic, Ctrl+K for link, Ctrl+Shift+C for code block.
  10. 10Try the preview-only mode for a clean reading experience — great for proofreading and reviewing formatted content.
  11. 11Use the Undo/Redo buttons or Ctrl+Z / Ctrl+Shift+Z to recover from mistakes while editing.

Frequently Asked Questions

Is my Markdown content sent to a server?

∨
No. All Markdown parsing and HTML rendering happens entirely in your browser using the marked library. Your content never leaves your device — there are no servers involved. You can disconnect from the internet after the page loads and it will still work.

What Markdown syntax is supported?

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Full GitHub Flavored Markdown (GFM), including headings (H1-H6), bold, italic, strikethrough, links, images, ordered and unordered lists, task lists, code blocks with syntax highlighting, tables, blockquotes, horizontal rules, and inline code. The underlying parser is marked, one of the most popular and well-maintained Markdown libraries.

Can I import an existing Markdown file?

∨
Yes. Drag and drop a .md file directly onto the editor panel, or click the Open button to browse and select a file. The file content will replace the current editor content. You can also paste Markdown text directly.

Can I export the rendered HTML?

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Yes. Click Copy HTML to copy the complete rendered HTML to your clipboard — perfect for pasting into websites, emails, or CMS editors. You can also click Download and choose HTML format to save it as an .html file. Both options include the full rendered output with all formatting preserved.

What file formats can I save?

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Two formats: Markdown (.md) saves your raw source text for continued editing later. HTML (.html) saves the fully rendered output ready to publish. The HTML file includes a basic document structure with the rendered content.

Does it support tables and task lists?

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Yes. GitHub Flavored Markdown tables and task lists are fully supported. Create tables with pipes and dashes, and task lists with [x] and [ ] syntax. Both render correctly in the preview panel.

Is there a limit on content size?

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There is no hard limit, but very large documents (10,000+ lines) may slow down the live preview. For typical use cases like documentation, notes, or README files, performance is instant. If you need to edit very large files, switch to Edit-only mode to reduce rendering overhead.

Is this tool free to use?

∨
Completely free, no registration required, no ads that interfere with usage, and no rate limits. All processing runs locally in your browser. We earn revenue through non-intrusive display ads.

What is GitHub Flavored Markdown (GFM)?

∨
GFM is a superset of standard Markdown that adds tables (using pipes and dashes), task lists ([x] and [ ]), strikethrough (~~text~~), autolinks (bare URLs become clickable), fenced code blocks with syntax highlighting, and emoji shortcodes (:smile:). It is the most widely used Markdown variant, powering GitHub, GitLab, and many documentation platforms.

Can I use this editor for writing documentation or README files?

∨
Absolutely. The editor is ideal for writing README files, API documentation, internal wikis, and technical blog posts. Use the split view to see the rendered output as you write, ensuring your formatting is correct before publishing. Export as .md to continue editing elsewhere, or .html for direct publishing.

Does the editor support HTML in Markdown?

∨
Yes, raw HTML is preserved in the rendered output. You can embed HTML tags like <div>, <span>, <img>, or <iframe> directly in your Markdown and they will be passed through to the HTML output. This is useful for adding custom styling or embedding media that Markdown syntax cannot express.

How do I create a table of contents in Markdown?

∨
Markdown does not have native TOC syntax, but you can manually create one using heading anchors. Headings automatically generate anchor links: '# Introduction' becomes '#introduction'. You can also use the auto-generated heading IDs to create a manual TOC list: [Introduction](#introduction), [Getting Started](#getting-started). Some platforms auto-generate TOCs from headings.

Can I collaborate on Markdown files with this editor?

∨
This is a single-user editor with no real-time collaboration features. For collaboration, export your Markdown file and share it via version control (Git) or collaborative platforms. The editor is designed for individual writing and formatting, not multi-user editing sessions.

How do I add images in Markdown?

∨
Use the image syntax: ![alt text](image-url). Click the image button in the toolbar to insert the syntax at the cursor position. The preview panel will render the image if the URL is accessible. For local images, you'll need to upload them to a hosting service first, as the editor runs entirely client-side.

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