DevBolt
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How do I preview Markdown online?

Type or paste your Markdown in the editor and see a live-rendered preview side by side. The tool supports GitHub Flavored Markdown including tables, task lists, fenced code blocks with syntax highlighting, and strikethrough. Your content never leaves your browser.

Format headers and lists
Input
# My Title
- Item one
- Item **two**
- Item *three*
Output
<h1>My Title</h1>
<ul>
  <li>Item one</li>
  <li>Item <strong>two</strong></li>
  <li>Item <em>three</em></li>
</ul>
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Markdown Preview

Write Markdown on the left, see the rendered preview on the right.

Hello, Markdown!

This is a live preview editor. Start typing on the left to see rendered output here.

Features

  • Bold and italic text
  • Links
  • Inline code and code blocks
  • Lists, blockquotes, and more

Code Block

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

Blockquotes work too. This is great for documentation.

Feature Status
Headings Supported
Lists Supported
Tables Supported

Tips & Best Practices

Pro Tip

GitHub-Flavored Markdown adds tables, task lists, and more

Standard Markdown (CommonMark) doesn't support tables, strikethrough, task lists, or autolinked URLs. GitHub-Flavored Markdown (GFM) adds all of these. If your content renders on GitHub (READMEs, issues, PRs), use GFM syntax. Other platforms may use different extensions.

Common Pitfall

Two spaces at line end create a <br> — invisible bugs

In Markdown, a line break requires either two trailing spaces or a backslash before the newline. Invisible trailing spaces cause unexpected line breaks, and many editors strip trailing whitespace automatically. Use a backslash (\) at the end of the line for explicit, visible line breaks.

Security Note

Markdown can contain raw HTML and XSS vectors

Most Markdown renderers allow inline HTML. If you render user-submitted Markdown without sanitization, <script>alert('xss')</script> executes. Always sanitize HTML output with a library like DOMPurify. GitHub and GitLab strip dangerous tags — your app should too.

Real-World Example

Reference-style links improve readability in long docs

Instead of inline links [text](https://very-long-url.com/path/to/resource?param=value), use reference-style: [text][1] and define [1]: https://very-long-url.com/... at the bottom. This keeps paragraphs readable and makes URL updates a single-line change.

Frequently Asked Questions

How do I preview Markdown rendering in real time?
Type or paste Markdown in the editor panel and DevBolt shows the rendered HTML output instantly in the preview panel. Changes update in real time as you type, providing immediate visual feedback. The preview supports all standard Markdown elements plus GitHub Flavored Markdown extensions including fenced code blocks, task lists, tables, strikethrough, and autolinks. This is useful for writing README files, documentation, blog posts, and any content that will be rendered as Markdown.
What Markdown syntax is supported in the preview?
DevBolt's preview supports headings (# through ######), bold (**text**), italic (*text*), links ([text](url)), images (![alt](src)), unordered and ordered lists, blockquotes, inline code, fenced code blocks with language identifiers, horizontal rules, tables with alignment, task lists (- [x] done), strikethrough (~~text~~), and HTML passthrough. This covers GitHub Flavored Markdown which is the most common Markdown variant used in developer documentation.
How do I add code blocks with syntax highlighting in Markdown?
Use fenced code blocks with triple backticks and a language identifier. Start with ``` followed by the language name (js, python, go, rust, etc.) on the same line, write your code, then close with ```. The preview renders syntax-highlighted code blocks. Inline code uses single backticks for short snippets within text. For code that itself contains backticks, use double backticks as delimiters. Fenced blocks preserve whitespace and formatting exactly as written.

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