Markdown to HTML Converter

Professional Markdown to HTML converter for developers.

100% Browser-Based • Local Processing
Markdown
Preview

Waiting for Markdown Words 0 Characters 0 HTML 0 B

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🔒 Local Processing. Your code never leaves your device.

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🌐 Fully Client-Side. Runs instantly in your browser.

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⚡ No accounts. No API keys. Just open and use.

Browser Based

🚀 No installs, no CLI, no build step.

Overview

Convert Markdown to HTML — privately

Markdown to HTML parses your Markdown and renders each element to semantic HTML — headings to <h1>, **bold** to <strong>, links, lists, code, and GitHub-Flavored tables. This one runs entirely in your browser with a live preview, so your Markdown is never uploaded.

Markdown is good to write; the web reads HTML. This converter sits between the two. # headings become <h1> to <h6>, **bold** becomes <strong>, *italic* becomes <em>, [text](url) becomes an anchor, ![alt](src) becomes an image, lists become <ul> and <ol>, and a fenced block becomes <pre><code> carrying the language you named after the fence. GitHub-Flavored Markdown is on by default, which adds tables, task lists (- [ ]), strikethrough (~~text~~) and autolinks; the button in the bar turns it off for strict CommonMark.

Paste or type and the preview redraws as you go, so you can see the document rather than the markup. The segment above it swaps that preview for the HTML itself, and Copy and Download hand over the same bytes either way. Line breaks is the other switch: with it off, two lines with no blank line between them join into one paragraph the way Markdown specifies, and with it on each one starts on its own line, which is how most chat and issue trackers behave.

The Markdown to HTML converter in dark mode: a release-notes document in the cyan Markdown pane, and the magenta preview pane beside it showing the same document rendered with a heading rule, a bulleted list, an inline code span, a link and a blockquote
The preview is the document, not the markup. The segment above it swaps in the HTML whenever you want to read that instead

Privacy is the point. Everything runs in your browser — no server, no upload, no logging. Drafts, internal docs and private notes are the normal input for a tool like this, and none of it leaves the device. Once the page has loaded it works offline.

The preview cannot run what you paste. Markdown lets raw HTML through, so a README from a stranger can carry a <script> or an onerror attribute, and a preview that simply drops the parsed HTML into the page runs it there. This one renders into a sandboxed frame with scripts disabled and no access back to this page, so the thing you are inspecting cannot touch the tool you are inspecting it with.

Two honest caveats. First, the HTML you copy is not sanitised — that is deliberate, because a README's inline HTML is usually the reason it was written that way, and stripping it would hand you a different document. The sandbox protects the preview; it does not clean the output. If the Markdown came from somewhere you do not control, sanitise before you embed. Second, the output is structure, not styling: it carries no CSS and will look like wherever you paste it. The preview here uses its own small stylesheet purely so the document is readable.

The same conversion with the HTML segment selected: the right-hand pane now shows the generated markup as plain text, including a pre element whose code tag carries class equals language-js
The HTML view is the file you are about to copy, including the language class on the fenced block

For the reverse, see HTML to Markdown; to tidy the output, the HTML Formatter, or the HTML Minifier to shrink it.

Use cases

When Markdown to HTML helps

  • Publishing. Turn a Markdown draft into HTML a CMS or template will accept.
  • README preview. See how a repository's README renders before you push it.
  • Newsletters and email. Write in Markdown, paste the HTML into the sender.
  • Docs. Render Markdown documentation into embeddable markup.
  • Drafts you would rather not upload. Notes and internal docs convert without leaving the browser.
Guide

How to convert Markdown to HTML

Paste or type your Markdown

Type it, paste it, open a local file, or drop a .md file onto the editor pane. The file is read in your browser; it is not uploaded.

Choose the flavour

GitHub-Flavored is on by default and is what you want for a README: tables, task lists, strikethrough and autolinks. Turn it off for strict CommonMark, and the pipe table comes back as the literal characters you typed. Line breaks decides whether a single newline inside a paragraph becomes a <br> or is joined into the line above.

Read the preview, or read the HTML

There is no Convert button — the document is re-rendered on every keystroke. Preview shows what a reader sees, drawn in a sandboxed frame with scripts disabled; HTML shows the markup itself. The word count, character count and the size of the generated HTML sit under the panes.

Copy or download the HTML

Copy puts the markup on your clipboard; Download writes it into a small complete HTML file. Both hand over exactly the same bytes — the markup in the HTML view, character for character.

Clear and start again

Clear empties the editor for the next document. Sample loads a short document that exercises the cases naive converters get wrong — a table, a task list, a fenced block containing angle brackets, and raw inline HTML.

Good to know

What to keep in mind

  • Nothing is uploaded. Parsing and rendering run in your browser, and the page works offline once loaded.
  • Raw HTML passes through. The markup you copy is not sanitised — sanitise it yourself before embedding Markdown you did not write.
  • The preview is sandboxed. Scripts are disabled inside it and it has no access to this page, so previewing an untrusted document is safe even though the output is not clean.
  • Structure, not styling. The HTML carries no CSS. It inherits whatever the page you paste it into provides.
  • Fenced blocks keep their language. A hint after the opening fence becomes class="language-js", which is what a highlighter on your own site reads.
  • Flavours differ. Processors disagree on edge cases such as nested lists and hard breaks; this one targets CommonMark plus GFM.
Support

Frequently Asked Questions

The same document with GitHub-Flavored Markdown switched off: the preview pane now shows the pipe table and the task list as the literal characters that were typed, rather than a rendered table and checkboxes
With GitHub-Flavored Markdown off, the table and the task list are just the characters you typed — which is what strict CommonMark says they are
The converter on a 390-pixel phone: the Preview and HTML segment across the top, the two flavour buttons and the fullscreen button on one row, a tab strip switching between Markdown and Result, and the rendered document filling the pane
On a phone the two panes become a tab strip and the controls stack into two rows
How do I convert Markdown to HTML?

Paste or type your Markdown (or load a local file), and the tool parses it and renders the matching HTML — headings, bold and italic, links, images, lists, blockquotes, and code. Turn on GitHub-Flavored Markdown for tables and task lists. A live preview shows the result, and you can copy the HTML or download it. Everything happens in your browser; nothing is uploaded.

Does this upload my Markdown, and does it work offline?

No upload, and yes it works offline. All conversion happens in your browser using JavaScript — there's no server receiving your text, no logging, and no tracking. That matters for drafts and internal notes. Once the page has loaded it keeps working with no internet connection, which you can confirm in your browser's network tab.

What Markdown syntax does it support?

The full common set: ATX and setext headings, bold and italic, links and images, ordered and unordered lists (including nesting), blockquotes, inline and fenced code, horizontal rules, and hard line breaks. With GitHub-Flavored Markdown enabled you also get tables, task lists, strikethrough, and autolinks. It targets CommonMark plus GFM, so behaviour matches what you'd expect on GitHub for most documents.

Does it support tables, task lists, and strikethrough?

Yes, when GitHub-Flavored Markdown is enabled. Pipe tables (| a | b | with a --- separator row) render as HTML <table> elements, task lists (- [ ] and - [x]) render as checkboxes, and ~~text~~ renders as strikethrough. These are GFM extensions rather than core Markdown, so they only appear when GFM is on — which is why the option exists.

Is the HTML safe to embed, and does it sanitize?

Be careful here. Markdown allows raw inline HTML, and this tool passes it through unchanged — the output is not sanitized. For Markdown you wrote yourself that's fine. But if you're converting Markdown from an untrusted source (user input, a third party), a <script> or malicious attribute could pass straight through, so sanitize the HTML before embedding it to avoid XSS.

Does the HTML include CSS or styling?

No — the output is structure, not styling. You get clean, semantic HTML (<h1>, <p>, <ul>, <pre>), but no CSS is attached, so it inherits the styles of whatever page you embed it in. The live preview here uses its own look purely to illustrate the rendering; the copied HTML has no styling of its own. Add your own CSS to match your site.

Can I get syntax-highlighted code blocks?

Not coloured here, but the classes a highlighter needs are in the output. Name the language after the opening fence and the converter writes <pre><code class="language-python">, which is the convention Prism and highlight.js both read — so the code colours itself once you have loaded one of them on your own page. The preview in this tool renders code in a monospaced block without colouring it, because colouring it here would tell you nothing about how it will look there.

Can I convert a README to HTML?

Yes. Paste a GitHub README (or any Markdown file) with GitHub-Flavored Markdown enabled, and you'll get HTML close to how GitHub renders it — headings, tables, task lists, and fenced code included. It's a common way to preview a README or publish it outside GitHub. Remember the HTML has no CSS, so it will look plain until you apply styles.

Can I load a Markdown file instead of pasting?

Yes. You can open a local .md file and the tool reads it directly in your browser with the FileReader API — the contents load into the editor without being uploaded anywhere. This is handy for larger documents or ones you'd rather not copy and paste, and it's exactly as private as typing the Markdown by hand.

What's the difference between the preview and the HTML output?

The preview is the rendered result — how the HTML looks in a browser — while the HTML output is the underlying markup you copy or download. The preview is drawn in a sandboxed frame with its own small stylesheet, so it is readable and so nothing inside a pasted document can run; the markup you copy carries no styling and no changes at all.

Can it handle large Markdown documents?

Usually yes. Because it runs locally, the limit is your device's memory and CPU rather than a server cap, and modern browsers render large documents quickly. Very long or deeply nested Markdown can make the live preview update more slowly, but there's no upload size limit from us and nothing is sent anywhere — it's purely local performance.

Is it free, and are there limits?

Yes, completely free — no payment, no signup, no account, and no usage caps or watermarks. Since everything runs in your browser, there's nothing for us to meter; the only practical limit is your device's performance on very large documents. Use it as much as you like, including offline once the page has loaded.

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