Markdown to HTML: Libraries, Tools, and Best Practices (2026)

Markdown powers GitHub READMEs, dev blogs, documentation sites, and note-taking apps. Here's how to convert it to HTML effectively.

Markdown Libraries Compared

Library	Language	Speed	GFM	Extensions	Best For
marked	JS	Fast	Yes	Limited	Simple rendering
markdown-it	JS	Medium	Plugin	Rich	Feature-rich apps
remark	JS	Medium	Plugin	AST	Transformations
Goldmark	Go	Very fast	Yes	Rich	Go projects
Python-Markdown	Python	Medium	Extension	Rich	Python projects
Pandoc	Haskell	Slow	Yes	Extensive	Format conversion

Quick Conversion in JavaScript

// Using marked (most popular)
import { marked } from 'marked';
const html = marked.parse('# Hello World');

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

GFM (GitHub Flavored Markdown)

GitHub extends standard markdown with:

- [x] Task lists
- [ ] Like this one

| Tables | Are | Supported |
|--------|-----|-----------|
| cell   | cell| cell      |

~~Strikethrough text~~

javascript
// Fenced code blocks with syntax highlighting
console.log('hello');

Markdown in Node.js/React

// React component with remark
import ReactMarkdown from 'react-markdown';
import remarkGfm from 'remark-gfm';
import rehypeHighlight from 'rehype-highlight';

function Blog({ content }) {
  return (
    <ReactMarkdown
      remarkPlugins={[remarkGfm]}
      rehypePlugins={[rehypeHighlight]}
    >
      {content}
    </ReactMarkdown>
  );
}

Markdown in Python

import markdown

# Basic conversion
html = markdown.markdown('# Hello')

# With extensions
html = markdown.markdown(text, extensions=[
    'tables',
    'fenced_code',
    'toc',
    'footnotes'
])

Security: Sanitizing HTML Output

Always sanitize markdown-to-HTML output in user-generated content:

import { marked } from 'marked';
import DOMPurify from 'dompurify';

const rawHtml = marked.parse(userInput);
const safeHtml = DOMPurify.sanitize(rawHtml);

Without sanitization, users can inject <script> tags via markdown.

Try It Online

Convert markdown to HTML instantly with our free Markdown to HTML Converter — supports GFM, live preview, and syntax highlighting.

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What markdown library do you prefer? Let me know in the comments!