Markdown to HTML Converter Live Preview, Source Output, and One-Click Copy

What this converter does

This tool takes text written in the Markdown syntax and turns it into HTML. Every heading, paragraph, list, link, code block, and blockquote in the source is turned into the corresponding HTML element. The output appears in two places on the page: a rendered preview so you can see how it looks, and a source panel so you can copy the raw markup into another system. Everything happens in your browser, and nothing is uploaded to a server.

Markdown is popular because it is easier to write and read than HTML. A writer can type a hash symbol to make a heading instead of typing an angle-bracket tag, and the file remains legible as plain text. When a platform needs HTML, whether it is a content management system, a documentation site, an email template, or a static page, this tool bridges the gap in a single step.

If the AI insight button is pressed, only anonymous counts are sent to a small serverless function that runs once and then stops. The number of headings, the number of list items, the number of links, and the total length of the source are shared. The actual Markdown text and the generated HTML are never included.

The Markdown syntax at a glance

Markdown is small enough to learn in an afternoon. The table below lists the syntax this converter supports and shows the HTML it produces.

Two habits make Markdown easier to work with. First, always leave a blank line between a heading and the paragraph that follows, and between a paragraph and a list. Most parsers rely on blank lines to end a block cleanly. Second, keep the source simple. Markdown supports nested emphasis and nested lists, but the deeper you go, the harder the source is to read and the more likely a minor formatting difference between platforms will produce a different result.

How the conversion works

The converter reads the source line by line and groups lines into blocks. A block is one of the recognised elements: a heading, a paragraph, a list, a blockquote, or a code fence. Blank lines separate blocks, which is why blank lines matter so much in Markdown. Within a paragraph or list item, a second pass handles the inline syntax: bold, italic, inline code, links, and images.

Inside the parser, the input is split into lines, and each line is tested against a small set of patterns. A line that starts with a hash symbol becomes a heading, with the number of hashes determining the level. A line that starts with a hyphen, an asterisk, or a plus sign becomes an unordered list item. A line that starts with a digit followed by a period becomes an ordered list item. A line that starts with a greater-than sign becomes a blockquote. Three backticks open or close a code fence. Any other non-blank line becomes a paragraph.

Every piece of text that ends up inside an HTML element is escaped first. That means a less-than sign is turned into the entity form, a greater-than sign is turned into the entity form, and an ampersand is turned into the entity form. This prevents an accidental tag in the Markdown from being interpreted as HTML. The inline pass then runs after escaping, so the emphasis, link, and code patterns are applied to already-escaped text, and the resulting HTML is safe to paste into a page.

CommonMark and GitHub Flavored Markdown

There is no single official Markdown specification. The original syntax was published by John Gruber in 2004 with a reference implementation, but the specification was informal and different tools interpreted the edge cases differently. CommonMark was created in 2014 to fix that by writing down exactly how every construct should be parsed. It is a strict specification with a test suite, and most modern parsers follow it or a close variant.

GitHub Flavored Markdown, often shortened to GFM, extends CommonMark with several additions: tables, task lists, strikethrough with double tildes, and autolinks for plain URLs. GFM is the dialect used on GitHub and in many other places that adopted GitHub's conventions. This converter follows CommonMark behaviour for the features it supports and does not include the GFM extensions.

Using the output in a CMS or email

The output of this tool is a fragment of HTML, meaning it is a sequence of elements without a doctype, a head, or a body. That is the right shape for pasting into a content management system, a documentation site, a static site generator, or a block in an email template. It is not a complete page, and it does not need to be.

Two things to check when you paste the output somewhere else. First, some systems sanitise the HTML they receive, which means they remove certain tags or attributes for security reasons. Images with an external URL, iframe elements, and inline scripts are the most common casualties. Paste the output into a draft, preview it, and see what the destination has kept. Second, the styling will come from the destination, not from this page. A heading in the output is an h2 tag, and the destination decides how that tag looks. The preview on this page uses neutral styles so you can read the structure, but the final appearance is set by the target system.

Accessibility and semantics

Good Markdown leads to good HTML when the source reflects the meaning of the content. A heading should be a heading, not bold text on a paragraph. A list should be a list, not a series of lines with asterisks typed at the start. A link should have a label that describes where it goes, and an image should have alt text that describes what it shows. These conventions are not cosmetic; they help screen readers and search engines understand the page.

After conversion, take a moment to check the source panel. The heading levels should climb in order: an h1 for the page title, an h2 for a main section, an h3 for a subsection inside it. Skipping levels, or jumping from an h1 to an h4, makes the page harder to navigate for assistive technology. Link labels should be descriptive rather than generic; click here and read more are less useful than open the pricing page and read the full announcement.

Common mistakes

Forgetting the blank line before a list. Most parsers need a blank line to close the previous paragraph and begin a list. Without it, the list markers may be treated as ordinary text. The preview on this page will show you immediately whether the list has been recognised.

Mixing bold and italic without spaces. Bold markers need two asterisks with no space next to the text. Italic markers need one asterisk with no space. If you type a space between the asterisk and the text, the emphasis will not be recognised and the asterisks will appear as characters.

Typing a URL with a space in it. Markdown link syntax expects the URL to be a single run of characters. If a URL contains a space, replace it with the percent-encoded form or use an anchor tag directly in the destination system. Most editors and browsers handle the percent encoding for you when you copy a URL from the address bar.

Assuming tables are supported. Tables are a GFM extension, not part of the CommonMark core, and this converter does not implement them. If you need a table, write it as HTML in the destination, or convert a table from Markdown with a tool that specifically supports GFM.

Putting sensitive text in the source. Even though everything runs in the browser, the source panel and preview are visible on screen. If you are working on a shared computer, close the tab when you are finished. Treat a public terminal the same way you would treat any other editing session.

Editing the HTML and not the Markdown. The Markdown file is the source of truth. If you edit the generated HTML directly and then regenerate from the same Markdown, the manual edits are lost. Keep the Markdown as the master copy and treat the HTML as a build artifact.

Where this tool stops

This converter supports the CommonMark core: headings, paragraphs, emphasis, inline code, fenced code blocks, links, images, unordered lists, ordered lists, and blockquotes. It does not support tables, task lists, footnotes, definition lists, strikethrough, automatic links, or embedded HTML. It does not render a full HTML document with a head and a body, and it does not apply any style beyond what is shown in the preview on this page.

It also does not verify that the links in your Markdown work, that the images resolve, or that the destination system will accept the output without modification. Those checks belong to the person publishing the content and to the platform where it will live. If you are publishing to a system with a strict content security policy, review the destination's allowed tags before you commit the output.

What the tool does give you is a fast, private way to see what your Markdown becomes, check the structure, and copy or download the HTML in a single step. Used together with a quick preview in the destination system, it is a practical starting point for anyone who writes in Markdown but publishes in HTML.