Self-contained HTML files from your AI output. Runs entirely in your browser — your content never touches a server.
Three steps. Five seconds.
Drop your markdown into the editor. Plain text works too.
Choose your look. The preview shows the exact output.
Click HTML. File downloads instantly. No waiting.
Your content never leaves your device. No upload, no server, no risk.
One HTML file with all CSS bundled inline as a <style> tag. No CDN links, no font imports, no JavaScript. The file renders identically today, tomorrow, and ten years from now.
Most HTML converters output files that reference external stylesheets or fonts. When those CDN links break (and they do), your document breaks. Our output is a single, hermetically sealed file. Move it, email it, archive it — it always works.
The markdown parser, theme system, and HTML generator all run in your browser's JavaScript engine. No fetch request, no upload, no server round-trip. Generation completes in under 200 milliseconds.
We use markdown-it for parsing and Shiki for syntax highlighting — both running locally. The HTML document is assembled as a string, converted to a Blob, and triggered as a download via the native browser API. Your content never touches a network interface.
Once the page is loaded, HTML export works without any internet connection. Perfect for secure environments, field work, or unreliable WiFi.
This is a direct consequence of client-side architecture. Since no server call is needed, no network is needed. You can disconnect your WiFi, switch to airplane mode, or be in a submarine — HTML export still works.
The live preview and the exported HTML use the exact same CSS theme string. What you see in the preview is what you get in the download. No rendering differences, no surprise layout shifts.
This is architecturally guaranteed by ARCH-4 in our design: the same THEME_CSS variable drives the preview panel, HTML export, and PDF export. It's not "similar" — it's the identical stylesheet injected into all three outputs.
How we differ from typical converters.
| Feature | MarkdownTools | Others |
|---|---|---|
| Runs in browser | 100% client-side | Server upload required |
| Works offline | Yes | No |
| Content privacy | Never leaves device | Uploaded to server |
| External dependencies | Zero — fully self-contained | CDN links that can break |
| Generation speed | < 200ms | 2-5 seconds |
| Signup required | No | Usually yes |
| Theme options | 3 professional themes | 1 default |
| Code highlighting | Shiki (VS Code engine) | Basic or none |
| Free exports | Unlimited | 1-5 per day |
Anyone who needs markdown to look good without learning CSS.
Attach a beautiful HTML file instead of raw markdown. Recipients open it in any browser — no special software needed.
Generate themed HTML pages from markdown and host them anywhere — GitHub Pages, Netlify, S3, or your own server.
Convert internal docs to self-contained HTML files for offline access in air-gapped environments or field work.
Transform project notes and specifications into polished HTML documents that look professional without any design work.
Generate a styled HTML preview of your markdown to check formatting before committing to a repository or CMS.
Export documents as self-contained HTML for long-term archival. No external dependencies means the file renders correctly decades later.
Markdown is designed to be converted to HTML — that's literally what it was created for. But "converting" markdown to HTML usually means running it through a parser and getting unstyled output. No typography, no spacing, no visual hierarchy. Just raw semantic HTML that looks like a 1995 web page.
MarkdownTools goes further. It converts your markdown to HTML and wraps it in a complete, styled document with professional typography, proper spacing, and one of three carefully designed themes. The result is a self-contained HTML file you can open in any browser, attach to an email, or host on any web server.
The entire process happens in your browser. Your content is never uploaded to a server. The HTML file is generated client-side using the Blob API and downloaded directly — making it the most private way to convert markdown to a shareable format.
When you click the HTML export button, MarkdownTools runs your markdown through a CommonMark-compliant parser (markdown-it) to produce semantic HTML. It then wraps that HTML in a complete document template with a DOCTYPE, charset declaration, viewport meta tag, and the active theme's CSS bundled as an inline stylesheet.
The complete HTML string is converted to a Blob, a temporary object URL is created, and a download is triggered via a hidden anchor element. The entire process completes in under 200 milliseconds — fast enough that no loading indicator is needed.
Because everything runs in the browser's JavaScript engine, this works without an internet connection. You can paste markdown, switch themes, and export HTML files while completely offline. The files are also fully self-contained — no external font imports, no CDN dependencies, no network requests needed to render.
HTML and PDF serve different purposes. PDF is the right choice when you need a fixed-layout document for printing, formal delivery, or archival where the visual appearance must be identical on every device. It's also better for documents that will be viewed without a browser.
HTML is the right choice when you need a lightweight, shareable format that adapts to different screen sizes. HTML files are smaller than PDFs, render instantly in any browser, and are searchable and selectable. They're also better for web hosting, email attachments (most email clients preview HTML), and situations where you want recipients to copy text from the document.
MarkdownTools supports both. You can preview your content with any theme and export to either format. The same CSS theme drives both outputs, so the visual appearance is consistent whether you export as HTML or PDF.
MarkdownTools uses markdown-it, a fast CommonMark-compliant parser. This means full support for headings (h1-h6), paragraphs, bold, italic, strikethrough, inline code, fenced code blocks with language-specific syntax highlighting, blockquotes, ordered and unordered lists with arbitrary nesting, tables with column alignment, horizontal rules, links, and images.
Code blocks are enhanced with Shiki syntax highlighting — the same engine used by VS Code — supporting accurate coloring for JavaScript, TypeScript, Python, Go, Rust, HTML, CSS, SQL, Bash, and dozens of other languages. This highlighting is included in both the live preview and the exported HTML.
All three themes (Clean, Classic, Elegant) provide complete styling for every markdown element. Tables have proper borders and header styling. Blockquotes have distinctive left borders and italic styling. Code blocks have background shading and monospace fonts. The themes differ in typography, spacing, and visual personality — but all of them fully support every markdown feature.
Everything you need to know.
Yes, completely free with no limits. HTML export runs entirely in your browser — it costs us nothing to provide, so there's no reason to charge for it. No signup, no account, no limits on the number of exports.
Your colleagues deserve better. Convert to HTML in 5 seconds and send something beautiful.