Markdown Editor

What Is Markdown?

Markdown is a lightweight markup language created by John Gruber in 2004. It lets you add formatting to plain text files using simple punctuation — no HTML tags needed. A # before a word creates a heading, wrapping text in **double asterisks** makes it bold, and a hyphen at the start of a line turns it into a list item.

Because Markdown files are plain text, they work everywhere: GitHub README files, documentation sites, blog posts, note-taking apps like Obsidian and Notion, and countless developer tools. Markdown is the default format for most static site generators including Jekyll, Hugo, and Astro.

How to Use This Online Markdown Editor

Type or paste your Markdown into the left panel. The right panel updates instantly, showing a live rendered HTML preview. No button clicks, no loading — the preview is always in sync.

Key Features

Split-Screen View — The editor and preview sit side by side, so you never lose sight of either. On mobile, the panels stack vertically for easy scrolling.

Copy HTML — Click “Copy HTML” to copy the rendered output to your clipboard. Paste it directly into a content management system, an email template, or any HTML-based tool.

Download .md — Save your work as a .md file at any time. The file opens in any text editor and remains portable across all platforms.

Load Example — New to Markdown? Click “Load Example” to insert a starter template that demonstrates headings, lists, code blocks, links, and tables all at once.

Word and Character Count — The word and character counter below the toolbar updates in real time. Use it to hit content length targets for blog posts, social media, or documentation.

Fullscreen Mode — Click ”⛶ Fullscreen” to expand the editor to the full screen. Press Escape or click “Exit Fullscreen” to return to the normal view.

Markdown Syntax Quick Reference

Headings

# Heading 1
## Heading 2
### Heading 3

Use one # for the top-level heading, two for a sub-heading, and so on up to six levels.

Bold and Italic

**bold text**
*italic text*
~~strikethrough~~

Links and Images

[Link text](https://example.com)
![Alt text](https://example.com/image.png)

Lists

Unordered lists use a hyphen or asterisk prefix:

- Item one
- Item two
- Item three

Ordered lists use numbers followed by a period:

1. First
2. Second
3. Third

Code

Wrap inline code in single backticks: `const x = 1;`

For multi-line code blocks, use triple backticks. Add the language name for optional syntax highlighting:

```javascript
function add(a, b) {
  return a + b;
}

### Tables (GFM)

GitHub Flavored Markdown supports tables with a pipe (`|`) syntax:

The separator row (`|-------|`) is required. Column alignment is optional: use `:---` for left, `---:` for right, and `:---:` for center.

### Blockquotes

This is a blockquote. It can span multiple lines.

## Why Use an Online Markdown Editor?

You do not need to install any software. Open the tool in your browser and start writing immediately. The editor works offline once the page is loaded, since all processing happens locally in JavaScript — no server, no account, no file uploads.

This tool is useful for writing README files, preparing documentation drafts, testing Markdown syntax before publishing, or quickly generating HTML from Markdown without setting up a build tool.

All formatting is sanitized before display, so rendered HTML is safe to preview in the browser even if the input contains unexpected content.