A lightweight markup language for formatting text in a simple and readable way.

Where is Markdown used?

GitHub, documentation, blogs, notes and many technical writing platforms.

Markdown Editor Online: Convert MD to HTML for Free

What is Markdown and Why Is It So Popular

Markdown is a lightweight markup language created in 2004 by John Gruber and Aaron Swartz with the goal of allowing writers to create formatted text using a simple, readable syntax. Unlike HTML, Word, or other complex formats, Markdown uses common characters like asterisks, hyphens, and brackets to define formatting, making documents readable even without rendering.

Our Markdown to HTML Converter is a free tool that instantly converts Markdown to valid HTML, with live preview and support for GitHub Flavored Markdown (GFM). It works 100% in the browser without sending data to external servers, ensuring complete privacy.

History and Philosophy of Markdown

Markdown was born from the frustration of having to write web documents in verbose HTML. John Gruber described it on his official website:

"Markdown is a text-to-HTML conversion tool for web writers. Markdown allows you to write using an easy-to-read, easy-to-write plain text format, then convert it to structurally valid XHTML (or HTML)."

The fundamental principles of Markdown are:

Readability: Source text should be readable without rendering
Simplicity: Syntax should be intuitive and minimal
Portability: .md files are plain text, openable anywhere
Compatibility: Inline HTML is allowed when needed

Complete Markdown Syntax

Headings

# Heading 1 (H1)
## Heading 2 (H2)
### Heading 3 (H3)
#### Heading 4 (H4)
##### Heading 5 (H5)
###### Heading 6 (H6)


Heading 1
=========

Heading 2
---------

Text Formatting

*italic* or _italic_
**bold** or __bold__
***bold italic*** or ___bold italic___
~~strikethrough~~ (GFM)
`inline code`

Lists


- Item 1
- Item 2
  - Sub-item 2.1
  - Sub-item 2.2
- Item 3


1. First
2. Second
3. Third


- [x] Completed task
- [ ] Pending task
- [ ] Another task

Links and Images


[Link text](https://example.com)
[Link with title](https://example.com "Tooltip title")


[Google][1]
[GitHub][gh]

[1]: https://google.com
[gh]: https://github.com "GitHub"


![Alt text](https://example.com/image.jpg)
![Alt text](image.jpg "Optional title")


[![Alt](image.jpg)](https://example.com)

Blockquotes

> This is a quote.
> It can span multiple lines.
>
> > Nested quotes
> > are supported.

Code


Use the `console.log()` function for debugging.


    function hello() {
        console.log("Hello!");
    }


```javascript
function hello() {
    console.log("Hello!");
}
```

```python
def hello():
    print("Hello!")
```

Tables (GitHub Flavored Markdown)

| Column 1 | Column 2 | Column 3 |
|----------|:--------:|---------:|
| Left     | Center   | Right    |
| Text     | Text     | Text     |


:--- left
:---: center
---: right

Horizontal Rules

---
***
___

(at least 3 characters)

Escape Characters

\*not italic\*
\# not a heading
\[not a link\]
\`not code\`

7+ Real-World Use Cases

1. Software Documentation (README.md)

Every open source project on GitHub, GitLab, or Bitbucket uses README.md:

# Project Name

[![Build Status](https://ci.example.com/badge.svg)](https://ci.example.com)
[![License](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)

Brief project description.

## Installation

```bash
npm install my-package
```

## Usage

```javascript
const pkg = require('my-package');
pkg.doSomething();
```

## License

MIT

2. Blog Posts and CMS

Platforms like Ghost, Hugo, Jekyll, Gatsby use Markdown for content:

---
title: "How to Use React Hooks"
date: 2024-01-15
author: "John Doe"
tags: ["react", "javascript", "tutorial"]
---

## Introduction

React Hooks have revolutionized how we write components...

## useState

```jsx
const [count, setCount] = useState(0);
```

3. Notes and Knowledge Bases

Applications like Notion, Obsidian, Typora use Markdown:

# Meeting Notes - 2024-01-15

## Participants
- John Smith (PM)
- Jane Doe (Dev)

## Decisions
- [x] Release v2.0 by March
- [ ] Database architecture review

## Action Items
1. @john: Create roadmap
2. @jane: POC new feature

4. API Documentation

OpenAPI/Swagger, Postman, and other tools use Markdown:

## GET /api/users

Returns the list of users.

### Query Parameters

| Name   | Type   | Required | Description          |
|--------|--------|----------|----------------------|
| limit  | number | No       | Max results (default 10) |
| offset | number | No       | Pagination offset    |

### Example Response

```json
{
  "users": [
    {"id": 1, "name": "John"}
  ],
  "total": 100
}
```

5. Email Newsletters

Services like Mailchimp, ConvertKit support Markdown:

# Weekly Newsletter

Hello **{{name}}**!

This week we published:

1. [TypeScript 5.0 Guide](/blog)
2. [10 VS Code Extensions](/blog)

> "Simplicity is the ultimate sophistication" - Leonardo

---

*You received this email because you subscribed to...*

6. Issue Tracking and PRs

GitHub/GitLab Issues and Pull Requests use Markdown:

## Bug: Login not working on Safari

### Description
Login form doesn't submit data on Safari 17.

### Steps to Reproduce
1. Open Safari
2. Go to /login
3. Enter credentials
4. Click "Login"

### Expected vs Actual
- **Expected**: Redirect to dashboard
- **Actual**: Page reloads without action

### Environment
- Browser: Safari 17.0
- OS: macOS Sonoma

### Screenshots
![Bug screenshot](image-url)

7. Chat and Messaging

Discord, Slack, Teams support a subset of Markdown:

**Important**: The meeting has been moved to 3:00 PM

~~Old time: 2:00 PM~~

Agenda:
- Sprint review
- Q2 planning
- `demo-feature-branch`

Markdown → HTML Conversion Examples

Markdown Input

# Quick Guide

This is an **example** of text with *emphasis*.

## Shopping List

- Bread
- Milk
- Coffee

## Useful Links

Visit [THEJORD](https://thejord.it) for more tools.

HTML Output

<h1>Quick Guide</h1>
<p>This is an <strong>example</strong> of text with <em>emphasis</em>.</p>
<h2>Shopping List</h2>
<ul>
  <li>Bread</li>
  <li>Milk</li>
  <li>Coffee</li>
</ul>
<h2>Useful Links</h2>
<p>Visit <a href="https://thejord.it">THEJORD</a> for more tools.</p>

Markdown Parsing Libraries

JavaScript / Node.js

// marked - fast and lightweight
import { marked } from 'marked';
const html = marked.parse('# Hello\n\nWorld');

// markdown-it - extensible with plugins
import MarkdownIt from 'markdown-it';
const md = new MarkdownIt();
const html = md.render('# Hello');

// remark - AST-based, MDX ecosystem
import { remark } from 'remark';
import html from 'remark-html';
const result = await remark().use(html).process('# Hello');

// showdown - browser compatible
const converter = new showdown.Converter();
const html = converter.makeHtml('# Hello');

Python

# markdown - standard library
import markdown
html = markdown.markdown('# Hello\n\nWorld')

# markdown2 - more features
import markdown2
html = markdown2.markdown('# Hello', extras=['tables', 'fenced-code-blocks'])

# mistune - fast
import mistune
html = mistune.html('# Hello')

# python-markdown with extensions
import markdown
html = markdown.markdown(text, extensions=['tables', 'toc', 'codehilite'])

PHP

<?php
// Parsedown - popular and fast
$parsedown = new Parsedown();
$html = $parsedown->text('# Hello');

// league/commonmark - CommonMark compliant
use League\CommonMark\CommonMarkConverter;
$converter = new CommonMarkConverter();
$html = $converter->convert('# Hello');

// Michelf/php-markdown
use Michelf\Markdown;
$html = Markdown::defaultTransform('# Hello');
?>

Go

// goldmark - CommonMark compliant
import "github.com/yuin/goldmark"
var buf bytes.Buffer
goldmark.Convert([]byte("# Hello"), &buf)

// blackfriday - popular
import "github.com/russross/blackfriday/v2"
html := blackfriday.Run([]byte("# Hello"))

Comparison: Markdown Flavors

Feature	Standard	CommonMark	GFM	MDX
Tables	❌	❌	✅	✅
Task lists	❌	❌	✅	✅
Strikethrough	❌	❌	✅	✅
Autolinks	❌	❌	✅	✅
Fenced code	❌	✅	✅	✅
Footnotes	❌	❌	❌	✅*
JSX components	❌	❌	❌	✅
Formal spec	❌	✅	✅	✅

* With plugins

FAQ - Frequently Asked Questions

What's the difference between Markdown and HTML?

Markdown is a simplified markup language designed to be readable as plain text. HTML is the web's native markup language, more verbose but with complete control over structure. Markdown is converted to HTML for web display. You can also mix HTML inside Markdown when you need more control.

What does GFM (GitHub Flavored Markdown) mean?

GFM is a Markdown extension created by GitHub that adds features useful for developers: tables, task lists (checkboxes), strikethrough, fenced code blocks with syntax highlighting, autolinks for URLs, and @user mentions. It has become the de facto standard for technical documentation.

Can I use HTML inside Markdown?

Yes, most Markdown parsers support inline HTML. You can insert tags like <div>, <details>, <video> directly in the document. Useful for features not supported by Markdown (e.g., collapsible sections, video embeds).

How do I add CSS classes or IDs to elements?

Standard Markdown doesn't support HTML attributes. Some extensions (e.g., markdown-it-attrs) allow syntax like {.class #id}. Alternatively, use inline HTML: <h2 class="special">Title</h2>.

Which Markdown editor do you recommend?

For desktop: VS Code (with extensions), Typora (WYSIWYG), Obsidian (note-taking). Online: StackEdit, Dillinger, HackMD. For documentation: GitBook, Docusaurus, MkDocs.

How do I handle images in Markdown?

The syntax is ![alt](url). For local images, ensure the path is correct relative to the .md file. To resize, use HTML: <img src="img.jpg" width="300">. For base64 images, use: ![](data:image/png;base64,...).

Does Markdown support math formulas?

Not natively, but many parsers support LaTeX with extensions. GitHub supports formulas with $inline$ and $$block$$ delimiters. Libraries like KaTeX and MathJax render formulas in the browser.

How do I create an automatic Table of Contents?

Some parsers generate TOC automatically from headings. In GFM, you can use [TOC] or manual links: [Section](#section). Tools like doctoc generate TOC automatically.

Writing Best Practices

✅ Do

Use hierarchical headings: H1 for title, H2 for sections, H3 for subsections
Keep lines short: ~80 characters for readability in source code
Use lists for enumerations instead of long paragraphs
Include alt text for all images (accessibility + SEO)
Specify language in fenced code blocks for syntax highlighting
Use descriptive links: "read the guide" instead of "click here"

❌ Don't

Don't skip heading levels: H1 → H3 without H2 is wrong
Don't use HTML when Markdown suffices: keep source readable
Don't forget blank lines before/after blocks (lists, code, quotes)
Don't use trailing spaces (issues with git and some parsers)
Don't mix styles: always use * or always use _ for emphasis

Related Tools on THEJORD

Discover other useful tools for developers and content creators:

JSON Formatter - Format and validate JSON (useful for code blocks)
Diff Checker - Compare Markdown document versions
Base64 Encoder - Encode images for inline embedding
RegEx Tester - Test patterns for search/replace in documents
Lorem Ipsum Generator - Generate placeholder text

External Resources

Official Markdown - John Gruber's original site
CommonMark - Standardized specification
GitHub Flavored Markdown Spec - GFM documentation
Markdown Guide - Complete tutorial

📝 Try our Markdown to HTML Converter →