Markdown to HTML Converter: Convert Markdown Syntax to HTML Online
Instantly convert Markdown syntax to clean HTML. Supports headings, lists, links, images, code blocks, tables, and GitHub Flavored Markdown.
Try the free online tool
Runs entirely in your browser — no signup, no uploads.
Markdown is the writing format of choice for developers, technical writers, and content creators who need to write structured documents with minimal formatting friction. Its simple syntax — asterisks for bold, pound signs for headings, backticks for code — is fast to type and easy to read in its raw form. But most websites and email clients require HTML, not Markdown, making a reliable converter essential.
This Markdown to HTML Converter transforms Markdown syntax into clean, well-formed HTML instantly in your browser. It supports CommonMark (the standardized Markdown specification) and GitHub Flavored Markdown (GFM) extensions including tables, task lists, strikethrough text, and fenced code blocks with syntax highlighting. A live preview pane shows the rendered result as you type.
Whether you are preparing blog content for a CMS that accepts HTML, converting documentation to embed in a web page, or just previewing how a README will render on GitHub, this tool covers every Markdown feature you are likely to need. This guide covers the supported syntax and provides tips for producing clean, accessible HTML output.
What Is Markdown and How Does It Convert to HTML?
Markdown is a lightweight markup language created by John Gruber and Aaron Swartz in 2004 with the goal of being readable as plain text while also convertible to HTML. The core philosophy is that a Markdown document should look like natural, formatted prose even in its raw form.
A Markdown parser reads the raw text and identifies syntax patterns: lines starting with # become <h1> tags, text wrapped in ** becomes <strong>, lines starting with - or * become <li> elements inside a <ul>, and so on. The parser outputs valid HTML that can be rendered in any browser.
CommonMark is the community-standardized specification that resolved ambiguities in the original Markdown spec. GitHub Flavored Markdown (GFM) extends CommonMark with tables, task checkboxes, strikethrough, and autolinked URLs. Most modern Markdown tools support at least CommonMark, with many also supporting GFM extensions.
How to Use This Tool
Converting Markdown to HTML is a two-panel workflow:
- 1
Enter your Markdown
Type or paste your Markdown text into the left input panel. The preview and HTML output update in real time as you type.
- 2
Check the live preview
The right panel shows a rendered HTML preview. Verify that headings, lists, links, images, code blocks, and tables display as expected.
- 3
View the raw HTML output
Switch to the 'HTML Output' tab to see the generated HTML markup. This is the code you will copy into your CMS, website, or email template.
- 4
Configure GFM extensions (optional)
Toggle GitHub Flavored Markdown support to enable tables, task lists, and strikethrough. Disable it if you need strict CommonMark output.
- 5
Copy the HTML
Click 'Copy HTML' to copy the generated HTML to your clipboard. The output is clean and ready to paste directly into any HTML context.
Common Use Cases
Markdown to HTML conversion is useful across many content workflows:
- CMS content entry: write content in Markdown locally then convert to HTML for CMS platforms that use rich-text HTML editors.
- Email newsletters: author email copy in Markdown and convert to HTML for pasting into email marketing platforms.
- Static site generation: convert Markdown blog posts to HTML as part of a static site generator pipeline.
- Documentation publishing: convert Markdown documentation to HTML for embedding in web applications or internal portals.
- GitHub README preview: preview exactly how your README.md will render on GitHub, including GFM tables and task lists.
Tips and Best Practices
Produce clean, compatible HTML from your Markdown with these tips:
- Use fenced code blocks with a language identifier: writing ```javascript instead of just ``` enables syntax highlighting in the output and signals the language to downstream processors.
- Validate your HTML output: paste the generated HTML into an HTML validator to check for any malformed tags, which can cause rendering issues in strict parsers.
- Escape special HTML characters in Markdown: if your Markdown contains literal < or > characters that are not Markdown syntax, the converter will escape them to < and > automatically.
- Use reference-style links for readability: in long documents with many links, reference-style links ([text][ref] and [ref]: url at the bottom) keep the source Markdown readable while generating the same HTML output.
- Preview in your target CMS or browser: the preview pane uses default browser styles. Your live site may render the HTML differently depending on its CSS. Always verify in the final environment.
Frequently Asked Questions
What is the difference between CommonMark and GitHub Flavored Markdown?
CommonMark is a standardized, unambiguous specification of the original Markdown syntax covering headings, lists, links, images, and code blocks. GitHub Flavored Markdown (GFM) extends CommonMark with tables, task list checkboxes, strikethrough text (~~text~~), and automatic URL linking.
Does the converter support syntax highlighting in code blocks?
Yes. Fenced code blocks with a language identifier (e.g., ```python) produce an HTML output with class attributes that can be targeted by syntax highlighting libraries like Prism.js or highlight.js on your website.
Can I convert Markdown tables to HTML?
Yes, when GitHub Flavored Markdown mode is enabled. GFM table syntax (using pipe characters and hyphens) is converted to valid <table>, <thead>, <tbody>, <tr>, <th>, and <td> HTML elements.
Does the output include a full HTML document or just the body content?
By default, the output is a fragment — just the converted body content without <html>, <head>, or <body> wrapper tags. Toggle 'Full HTML document' to wrap the output in a complete HTML5 document structure.
How are images handled in the conversion?
Markdown image syntax  converts to an <img> tag with the alt attribute and src set to the provided URL. The tool does not upload or host images — URLs must be absolute or relative to your website.
Can I embed raw HTML inside my Markdown?
Yes. Standard Markdown and CommonMark allow raw HTML tags to be embedded in Markdown. The converter passes them through to the output unchanged. Use this for HTML elements Markdown does not support, like <video> or <details>.
Is the conversion done server-side or client-side?
The conversion runs entirely in your browser using a JavaScript Markdown parser. No text is sent to a server, making it safe for confidential documentation and fast even without an internet connection.
Ready to use this tool?
Free, instant, no account required. Runs entirely in your browser.