Real-world use cases

• Embed a GitHub README on your product landing page

  You wrote your changelog or feature tour in `README.md` and want it on the marketing site without rewriting it as JSX. Paste the Markdown, copy the HTML output, drop it into a `<div class="prose">` and ship. Fenced code blocks keep their `<pre><code class="language-ts">` shape so Prism or hljs can colorize them downstream, and heading slugs stay stable so your existing `#installation` anchor links keep resolving. Beats running a full Markdown build pipeline for one page.

• Move a Lark or DingTalk note into Notion with formatting intact

  Lark, DingTalk and WeCom love letting you paste Markdown into a doc but refuse to give you formatted output back when you copy it out — you get raw `**bold**` and `#` symbols in Notion. Workaround: paste the Markdown here, switch to Preview, then Cmd+A / Cmd+C the rendered output. The clipboard now carries rich-text HTML, so pasting into Notion, Confluence, Quip, or a Gmail compose window preserves bold, lists, links and tables. Five seconds, no plugin.

• Build an email newsletter HTML body that survives Outlook

  You write the issue in Markdown because you don't want to babysit `<table>` tags. Paste it in, copy the HTML, then run it through an inline-CSS step (Premailer, Maizzle, or a CDN like inlineformat). Most clients — Outlook 2016 included — strip `<style>` blocks but respect inline `style=""` attributes, so this two-step pipeline is what gets your bold and links through to the inbox. Way less fragile than authoring HTML email by hand.

• Archive an old Hexo or Jekyll site as static HTML

  You're killing the static-site generator but want to keep 200 old posts readable. Loop each `.md` file through this tool (or copy-paste one at a time for a small site), wrap the HTML in a minimal shell template with a single stylesheet, and host the result as flat files on S3 or GitHub Pages. No Ruby toolchain to maintain, no Node version drift, just HTML that will render in 2036.

• Show an LLM your prompt the way it'll actually be rendered

  When you wrap example code in triple-backtick fences inside a prompt, GPT-4 / Claude / Gemini parse the fence and treat the inner block as a code unit — separate from prose. If you're debugging why the model is confusing your prose for code (or vice versa), paste your prompt here. The HTML preview shows you exactly where the `<pre><code>` boundaries land, which is the same chunking the model sees. Catches stray indentation that accidentally turns a paragraph into a code block.

Common pitfalls

• Markdown tables render to bare `<table>` with no borders by default — either wrap them in your site's `.prose` CSS, or run the HTML through an inline-styles step before pasting into rich-text editors.

• `[text](url)` does NOT add `target="_blank"` — when embedding into someone else's site, post-process to add `target="_blank" rel="noopener noreferrer"` so outbound clicks don't navigate away from the host page.

• Fenced code blocks like ```` ```ts ```` produce `<pre><code class="language-ts">` but the actual syntax coloring is a separate library (hljs, Prism, Shiki) — without one of those CSS themes loaded on your target page, the code will render in plain monospace.

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