Markdown to HTML Converter – Convert CommonMark or GitHub Flavored Markdown into sanitized HTML. Preview as you type, open a Markdown file, and copy a fragment or download a complete HTML document.
Rendered preview
Document structure
Counts of the elements found in your Markdown. Bars share one scale for easy comparison.
Table of Contents
What a Markdown to HTML converter does
Markdown is a simple method for formatting text with non-markdown characters. Use a single # for a heading, double asterisks to make text bold, and a dash at the beginning of a line to create a bullet. Quick to type and easy to read even before it’s rendered. Browsers don’t understand Markdown, though; they understand HTML. There are times, however, when you need to convert your shorthand notation into the tags that Web pages need, like <h1>, <p>, <strong> and <ul>.But sometimes you need to convert your shorthand to the tags that a Web page needs, such as <h1>, <p>, <strong> and <ul>.
This MD to HTML is a local tool that will convert your text in the browser, it will not send your Markdown to a conversion server. It loads its parser and styles from a CDN, and converts and previews it on your device. GFM mode is like markdown with tables, strikethrough, task lists and bare-link detection, while CommonMark mode is based on the CommonMark specification.
How to convert Markdown to HTML
- Insert or edit a Markdown file. Use CommonMark or GFM to match the source document. Task lists, tables, strikethrough and automatic links are all included in GFM.
- Choose your options. Semantic headings provide you with clean h1–h6 tags. The Bootstrap style maps them to utility classes which drop them directly into a Bootstrap page. Raw HTML is automatically escaped, but if it is on, it will be sanitized prior to output or preview. Make the output easier to read by pretty-printing it.
- Look at the HTML on the right. Copy or download the generated markup, or download it as a separate .html file.
The converter is intentionally “forgiving. An empty input results in a gentle hint, malformed tables do not produce an error and will fall back to plain paragraphs, and an unclosed code fence will still produce as much as it can, rather than a silent failure. That’s not what a markdown converter should do: fix problems, not cover them up.
When you’d use Markdown to HTML Converter
Normally, it is used to create content for a website. Writers use Markdown as a distraction-free environment to write, and convert to HTML before pasting into a content management system that requires tags. Developers can use it to convert README files into documentation pages, or to preview the rendering of a snippet in a comment system, or to validate email templates, with each tag being required to be valid.
Also it’s a teaching tool. If you are learning web development, and want to see what each symbol will generate in HTML, you can see them turn into HTML as you watch. These are all great use cases for a fast, reliable MD to HTML pass that a wiki can’t provide. The page is served with local conversion, but requires an internet connection to download the CDN-served libraries and styles.
Some tips on better output:
- Leave a line break between paragraphs. In Markdown, a hard break is created by two spaces at the end of a line, while a soft break is created by a normal line wrap.
- Use fenced code blocks with three backticks and a name for the language (the converter adds a class you will be able to style later).
- Use one h1 element per page to be accessible and to be SEO friendly. Under it use h2 and h3.
- Only accept raw HTML in exceptional circumstances. Sanitized for preview and output and reviewed for content before publishing.
- Use of a semantic heading for production marking, and the Bootstrap style when pasting into a framework that has these classes built in.
The most frequent errors to steer clear of
The first one is using raw HTML in the Markdown and expecting it to be beautified. HTML is escaped by default here and optional raw HTML is sanitized before it is output. The second is to not remember that two space at the end of a line will make a hard break, whereas one space will not. The third is inconsistent indentation of nesting lists, two or four spaces per level and be consistent. The output is a fragment by default, and if complete-document mode is enabled, the doctype, metadata, title and body are added to the output.
Related Tools
FAQ
Does this Markdown to HTML convertor have a cost?
Yes. No Sign-up, Rate limit and watermark on the output. All your applications are executed in your browser.
Will it forward my SMS to a web server?
No. It is converted on your device in JavaScript – no content leaves your device.
What are the Markdown features supported?
Both modes are capable of handling core headings, paragraphs, emphasis, links, images, lists, blockquotes and code. GFM also includes the features of tables, task lists, strikethrough, and links that are automatically created.
What is the reason for the difference in my output and GitHub’s?
CommonMark and GitHub Flavored Markdown have different syntax rules. Select flavor from your source document. GFM mode has tables, task lists, strikethrough and automatic links.
Is there a way to convert HTML to Markdown?
Not here — this tool is one way. If the output is kept to a point, it will be cleaner and easier to predict behavior.
Reviewed by: aFreeTools Editorial Team
Last updated: September 30, 2026
Freshness: It uses established Markdown parsing and HTML sanitization libraries, with options for common output styles. Always review converted markup in its target environment before publishing.
Disclaimer – This Markdown to HTML converter is provided for general informational and development use. The output is generated automatically and may need review before it is published. Always check converted markup in your own environment, and do not paste confidential content you would not otherwise process in a browser.