Markdown to Html

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What Markdown is and why convert it

Markdown is a lightweight way to write formatted text using plain characters: # for headings, asterisks for emphasis, hyphens for lists. It was created by John Gruber in 2004 so that writing for the web could be as readable as an email, and today it is used in README files, documentation, note-taking apps, forums and static site generators. Browsers do not display Markdown directly, so to publish it on a web page, in an email template or in a CMS that expects HTML, you convert it. This tool does that instantly and shows the result beside your text.

Supported Markdown syntax

The converter follows the common CommonMark and GitHub Flavored Markdown conventions for these elements. Rare edge cases, such as reference-style links, footnotes or HTML blocks spanning several paragraphs, are not supported; for those, a full Markdown library is the right tool.

Line breaks and paragraphs

In standard Markdown, a single line break inside a paragraph is treated as a space, and a blank line starts a new paragraph. That surprises people who paste text from chat apps or emails. If your text relies on single line breaks — addresses, poems, song credits — choose “Treat single newlines as <br>”. To force a line break in standard mode, many editors let you end a line with two spaces or a backslash.

Security: raw HTML and the preview

Markdown allows raw HTML, but pasting HTML you did not write into a web page can be dangerous: it may contain scripts or event handlers. By default this converter escapes any HTML in your Markdown, so it appears as text. If you choose to keep raw HTML, the output contains it as written, and the preview removes scripts, iframes and inline event handlers before displaying it. Links are restricted to web, email and relative addresses, so a javascript: link becomes a harmless #. If you publish user-supplied Markdown on a website, sanitise the resulting HTML on the server as well.

Worked example

The sample text converts a heading to <h1 id="project-notes">, the second heading to an <h2>, a nested bullet list to <ul> elements inside a list item, the numbered list to <ol>, the quote to a blockquote, and the table to a <table> whose second column is centred and third column right-aligned because of the colons in the divider row. The fenced code block becomes <pre><code class="language-js">, ready for a syntax highlighter.

Using the HTML

• Blog or CMS: paste the fragment into the HTML or code view of WordPress, Ghost, Shopify pages or similar editors.
• Email: paste into an email template editor; add inline styles if your email client strips stylesheets.
• Documentation: choose “Full HTML document” to get a standalone .html file you can open in any browser.
• Styling: the output contains semantic tags without classes (except the code language), so your site's own CSS styles it.

Markdown flavours and compatibility

Markdown has several dialects. The original 2004 description left some behaviour ambiguous, so CommonMark was created as a precise specification, and GitHub Flavored Markdown (GFM) adds tables, task lists, strikethrough and automatic links on top of it. Platforms such as Reddit, Discord, Slack, Notion and many static site generators each support slightly different subsets. This converter aims at the common core that behaves the same almost everywhere, plus GFM tables and task lists. If a document renders differently on another platform, check nested lists and emphasis next to punctuation first — those are where dialects most often disagree.

Privacy

The conversion happens in JavaScript on your device. Your text is not uploaded, stored or logged. Opening a .md file reads it locally in the browser.

Markdown tips for cleaner HTML

• Put a blank line before and after lists, tables, quotes and code blocks so they are recognised reliably.
• Use one heading level for each level of structure, without skipping from # to ### — it helps accessibility and search engines.
• Always write alt text for images: ![Chart of monthly sales](sales.png).
• Indent nested list items by two or more spaces consistently.
• Name the language after the opening fence of a code block so highlighters colour it correctly.