Markdown to HTML Converter Online

Paste Markdown and render it as HTML instantly. CommonMark + GitHub tables, fenced code, and images — 100% in your browser.

Input Markdown

Rendered Preview

What is a Markdown to HTML converter?

A Markdown to HTML converter takes a plain-text Markdown document — the same syntax used by README files, GitHub issues, and most static-site generators — and produces semantic HTML5: <h1> through <h6> for headings, <ul>/<ol> for lists, <pre><code> for fenced code blocks, <table> for GFM tables, and inline tags for emphasis, links, and images.

Most engineers write Markdown daily — pull request descriptions, ADRs, design docs, blog posts — but eventually need to publish it as HTML for a web page, an email, or a CMS that does not understand **bold**. This converter renders CommonMark plus GitHub tables in the browser, with no upload, no sign-in, and no server round-trip.

How to convert Markdown to HTML — 4 steps

Paste Markdown. Drop your .md source into the left pane, or click Load Sample.
Watch the preview. The right pane updates as you type with the rendered HTML — headings, lists, tables, and code blocks.
Toggle raw HTML. Click Raw HTML to see the generated markup verbatim instead of the visual preview.
Copy or paste. Click Copy HTML and paste into a CMS, email, or static page.

Sample input and output

# Title

A paragraph with **bold**, *italic*, and `code`.

- one
- two

[link](https://x.com)

<h1>Title</h1>
<p>A paragraph with <strong>bold</strong>, <em>italic</em>, and <code>code</code>.</p>
<ul><li>one</li><li>two</li></ul>
<p><a href="https://x.com">link</a></p>

CommonMark Support

Headings, emphasis, code, links, images, lists, blockquotes, fenced code, and horizontal rules — the full CommonMark core.

GitHub Tables

GFM tables with column-by-column alignment via the |:---:| separator syntax. Output uses inline style for portability.

Browser-Only

Markdown is parsed in your browser via JavaScript. Drafts, internal docs, and proprietary content never leave the device.

Common use cases

check_circlePasting README content into a website CMS or marketing landing page
check_circleConverting GitHub issue or PR descriptions into HTML email body
check_circleRendering MDX-lite content for a custom blog without a build step
check_circleGenerating HTML release notes from a Markdown CHANGELOG
check_circlePreviewing Markdown drafts before pushing to a documentation site
check_circleEmbedding rendered docs into a Confluence, Notion, or GDocs export
check_circleProducing HTML attachments for ticketing systems that do not support Markdown
check_circleQuick-rendering wiki snippets for internal SharePoint or Slack canvases

Markdown vs HTML — when to use each

Markdown is the right authoring format: it is human-readable in plain text, diffs cleanly in version control, and is faster to write than HTML. HTML is the right delivery format: browsers render it directly, email clients understand it, and CMS editors expect it. The conversion in this tool is one-way and lossless for the supported subset — you author in Markdown, publish as HTML, and keep the source as the canonical version.

Working with Markdown daily?

OpenFormatter ships a full set of Markdown-to-X tools — convert, format, and explore Markdown without leaving the browser.

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Frequently Asked Questions

What flavor of Markdown is supported?

The converter supports CommonMark — headings, emphasis, code, links, images, lists, blockquotes, horizontal rules, and fenced code blocks — plus GitHub-flavored Markdown (GFM) tables with column alignment via colon syntax. It does not currently parse footnotes, task lists, strikethrough, or definition lists. For most documentation, README, and blog use cases the supported subset is sufficient.

Why is my Markdown rendering oddly?

The most common culprits are missing blank lines (CommonMark requires a blank line before a list, table, or code block), inconsistent indentation, and unclosed inline marks (a stray asterisk turns the rest of the paragraph into italics). Paste the snippet alone into the input and add blank lines around any block element to isolate the issue.

Can I include raw HTML inside Markdown?

Standard CommonMark allows raw HTML and treats it as pass-through. This converter escapes HTML inside Markdown to keep output safe by default — pasted Markdown that contains <script> tags or onclick handlers will be rendered as text, not executed. If you need to embed verbatim HTML for trusted content, render the resulting HTML through your own sanitizer downstream.

Are line breaks preserved?

Per CommonMark, a single newline inside a paragraph is treated as a soft break (rendered as a space), and a blank line separates paragraphs. Two trailing spaces at the end of a line force a hard break. If you want every newline to become a <br>, you are looking for GitHub-style "soft-break-as-hard-break" behavior — that is not enabled here to match standard CommonMark output.

Does it support tables with column alignment?

Yes. GitHub-flavored Markdown tables are supported — use a colon on the left, right, or both sides of the dashes in the separator row to align left, right, or center. Example: |:---| left, |:---:| center, |---:| right. The alignment is emitted as inline style on every <th> and <td> in that column.

Can I download the rendered HTML?

Toggle the Raw HTML view to see the generated markup, then click Copy HTML. Paste it into any text editor and save as .html. The output is a single block of HTML5 fragments — wrap it in <!DOCTYPE html><html><body>...</body></html> if you need a standalone document.

Is my Markdown sent to a server?

No. The parser runs entirely in JavaScript inside your browser. Documentation drafts, internal notes, and proprietary content never leave your device. Verify in your browser DevTools Network tab — no requests fire when you type or paste.

How do I render math, diagrams, or footnotes?

Math (KaTeX/MathJax), Mermaid diagrams, and footnotes are CommonMark extensions, not part of the core spec. They are not rendered here — for full Obsidian or GitHub Wiki parity use a dedicated previewer, or post-process the HTML output with KaTeX/Mermaid client libraries.