AnyTool
Your files never leave your device. All processing happens locally in your browser.

How do I convert Markdown to HTML online?

Paste or type Markdown into AnyTool Markdown to HTML. It renders a live preview and produces clean HTML at the same time, with GitHub-Flavored Markdown — tables, task lists, strikethrough and autolinks — plus syntax-highlighted code blocks. Copy the HTML, download a full .html page, or grab just the fragment. Everything runs in your browser, so nothing is uploaded.

  • Live rendered preview and raw HTML output side by side as you type
  • GitHub-Flavored Markdown: tables, task lists, strikethrough, autolinks
  • Prism syntax highlighting, heading anchors and an auto table of contents
  • Output a full HTML document with inline CSS or just the fragment
  • Raw HTML is escaped by default — 100% client-side, no upload

What is

Markdown to HTML Converter

A Markdown to HTML converter parses Markdown — a lightweight plain-text formatting syntax — and turns it into the equivalent HTML markup, so headings, lists, links, tables and code blocks become valid HTML elements ready to publish on a web page.

Text Tools

Related terms

MarkdownGitHub-Flavored MarkdownCommonMarkHTMLSyntax Highlighting

Frequently Asked Questions

Yes. Raw HTML inside Markdown is escaped by default, so pasted content can never run scripts on the page.

By default the renderer is configured with html set to false, which escapes any raw HTML in your Markdown so embedded script or event handlers cannot execute. If you opt into an allow-raw-HTML mode, that preview is shown inside a sandboxed iframe without same-origin access, keeping it fully isolated from the page, its storage and its cookies.

Yes. Tables, task-list checkboxes, strikethrough and automatic URL linking are all supported and can be toggled on or off.

The converter uses markdown-it with GitHub-Flavored Markdown enabled, so pipe tables with column alignment, task lists like dash space bracket x, strikethrough with double tildes, and bare URL autolinking all render correctly. You can switch GFM off to fall back to plain CommonMark, and toggle line breaks, smart typography and autolinking independently.

Yes. Turn on full HTML document to wrap the output with a head, body and inline CSS, then download a self-contained .html file.

You can copy the HTML fragment, or enable the full-document option to wrap it in a complete HTML5 page with minimal inlined CSS — no external stylesheet or CDN — and download it as a .html file that opens and prints correctly on its own. A generated table of contents can also be prepended.

No. All conversion happens in your browser, so your content never leaves your device and the tool works offline.

The Markdown is parsed locally in your browser with markdown-it and highlighted with Prism. Nothing is sent to a server, there is no tracking, and the page works offline after the first load, so you can safely convert private notes, documentation or drafts.

Detailed Explanation

Methodology

How the Markdown to HTML Converter Works

AnyTool Markdown to HTML parses the source entirely in the browser with markdown-it, a CommonMark-compliant parser, and the GitHub-Flavored Markdown extensions for tables, task lists, strikethrough and autolinking. Fenced code blocks are tokenised and highlighted with Prism, whose language grammars are lazy-loaded on demand. Headings receive GitHub-style slug ids, and an optional table of contents is generated from them. The rendered preview and the raw HTML are produced from the same parse, so they always match.

  • Parsing uses markdown-it (CommonMark) with GitHub-Flavored Markdown extensions
  • Code blocks are highlighted by Prism with grammars loaded only when needed
  • Headings get GitHub-compatible anchor ids and an optional table of contents
  • Output can be a self-contained HTML document with inline CSS or a fragment
  • All conversion is client-side JavaScript — the Markdown is never uploaded
How It Works

HTML Sanitization and Safety

By default the renderer is configured with html set to false, so any raw HTML embedded in the Markdown is escaped rather than executed. This means pasted or imported Markdown cannot inject a script tag or event handler into the page. An optional allow-raw-HTML mode passes HTML through, but its preview is isolated inside a sandboxed iframe without same-origin access, so even hostile markup cannot reach the page, its storage or its cookies. Link protocols are validated so that javascript: and similar unsafe URLs are blocked.

  • Raw HTML is escaped by default (markdown-it html:false) to prevent script injection
  • The optional raw-HTML preview renders inside a sandboxed iframe with no same-origin access
  • Unsafe link protocols such as javascript: are blocked by a link validator
  • External links get rel="noopener noreferrer nofollow" and open in a new tab
Privacy & Security

Privacy and Offline Use

Because all parsing and highlighting run in the browser, the Markdown never reaches a server, there is no account or tracking, and the page works offline after first load. Rendering is debounced so the editor stays responsive on large documents, and you can copy the HTML, download a complete .html file, or copy just the fragment to paste into a CMS, blog or email template.

Markdown to HTML: in-browser (AnyTool) vs typical online converters
CapabilityAnyToolTypical online converters
Markdown handlingParsed in your browserOften posted to a server
PrivacyMarkdown never leaves deviceMay log or store submitted text
GitHub-Flavored MarkdownTables, task lists, strikethroughSometimes partial or absent
Syntax highlightingPrism, many languagesOften plain code blocks
Raw HTML safetyEscaped by default; sandboxed if allowedFrequently rendered unsafely
OutputFull document or fragment, with TOCUsually fragment only
Works offlineYes (PWA)No

Server-based converters can retain pasted Markdown in logs; AnyTool converts locally and uploads nothing.