What Is Markdown?

Markdown is a lightweight markup language created by John Gruber in 2004. Instead of writing HTML tags like <h1>Title</h1>, you write # Title. Instead of <strong>bold</strong>, you write **bold**. The plain text is readable on its own and can be converted to HTML by any Markdown processor.

Markdown solved a real problem: HTML is verbose and hard to read while writing. Markdown is clean and human-friendly, while still producing properly formatted HTML output.

Markdown Syntax Reference

Element	Markdown	HTML Output
Heading 1	# Title	<h1>Title</h1>
Heading 2	## Subtitle	<h2>Subtitle</h2>
Bold	**text**	<strong>text</strong>
Italic	*text*	<em>text</em>
Link	[label](url)	<a href="url">label</a>
Image		<img src="url" alt="alt">
Inline code	`code`	<code>code</code>
Blockquote	> text	<blockquote>text</blockquote>
Horizontal rule	---	<hr>

Lists in Markdown

Unordered lists use a dash, asterisk, or plus sign as a bullet:

- First item
- Second item
- Third item

Ordered lists use numbers followed by a period:

1. First step
2. Second step
3. Third step

Nested lists use indentation (two or four spaces):

- Parent item
  - Child item
  - Another child

Code Blocks in Markdown

Inline code uses single backticks: `const x = 1`. For multi-line code blocks, use triple backticks with an optional language identifier for syntax highlighting:

```javascript
function greet(name) {
  return `Hello, ${name}!`;
}
```

Code blocks are essential for technical documentation, README files, and developer tutorials.

Where Markdown Is Used

• GitHub — README files, issues, pull request descriptions, wikis.
• Reddit — post and comment formatting.
• Stack Overflow — question and answer formatting.
• Notion, Obsidian, Roam — note-taking and knowledge management apps.
• Static site generators — Jekyll, Hugo, Gatsby use Markdown for content.
• Documentation platforms — Read the Docs, MkDocs, Docusaurus.

How to Convert Markdown to HTML

Use the ToolsBox Markdown to HTML converter. Paste your Markdown in the left panel and the converted HTML appears instantly on the right, with a live rendered preview. You can copy the raw HTML or the rendered output for use in any website or CMS.

Frequently Asked Questions

What is Markdown?

Markdown is a lightweight markup language using plain-text symbols (# for headings, ** for bold) that converts to clean HTML. Created by John Gruber in 2004, it is designed to be readable as plain text while producing valid HTML output.

Who invented Markdown?

John Gruber, with contributions from Aaron Swartz, created Markdown in 2004. The goal was a format that looked clean as plain text but converted automatically to HTML — readable by humans and machines alike.

What is the difference between Markdown and HTML?

HTML uses explicit opening and closing tags like

Title

. Markdown uses shorthand like # Title that a processor converts to HTML. Markdown is faster to write; HTML offers more control over output.

Where is Markdown used?

GitHub (README files and issues), Reddit posts, Stack Overflow answers, Notion pages, Discord messages, static site generators (Jekyll, Hugo), and documentation platforms like MkDocs and Read the Docs all support Markdown.