What is HTML Viewer?

Need to see how your HTML looks without spinning up a server? That's exactly what this tool does. HTML Viewer takes your HTML (HyperText Markup Language) and renders it live in a preview pane right next to your code. HTML is the foundation of every web page — defined by the WHATWG HTML Living Standard maintained by browser vendors.

Whether you're prototyping a landing page, debugging an email template, or just checking if your markup is correct, this tool gives you instant visual feedback. No need to save files, open a browser tab, or run a local server. For best practices on writing semantic and accessible HTML, the <a href="https://web.dev/learn/html" target="_blank" rel="noopener">web.dev Learn HTML guide</a> is an excellent reference.

Everything runs in your browser. Your HTML never touches our servers. It's fast, free, and private.

How to Use the HTML Viewer

Follow these steps to preview and work with your HTML. Each step uses the actual buttons and features on this page.

Paste Your HTML or Load Sample

Paste your HTML into the left editor. It can be a full page with <html>, <head>, and <body> tags, or just a snippet. Click the Sample button to load example HTML. Make sure your HTML is valid — use the W3C Markup Validator if you're unsure.

<div style="font-family: Arial, sans-serif; padding: 20px;">
  <h1 style="color: #333;">Hello World</h1>
  <p>This is a <strong>sample HTML</strong> page.</p>
  <ul>
    <li>Item 1</li>
    <li>Item 2</li>
    <li>Item 3</li>
  </ul>
</div>

The preview updates automatically as you type.

See the Live Preview

The right panel renders your HTML instantly. You'll see exactly how the browser interprets your markup — styles, layout, images, and all. The preview is sandboxed using an iframe for security, isolating your code from the tool itself.

Adjust and Iterate

Edit your HTML in the left panel and watch the preview update in real time. Drag the splitter to adjust the panel sizes. Click Maximize to see the preview in fullscreen.

Share Your Work

Click Share to generate a shareable link for your HTML. Recipients will see both the code and the rendered preview.

When You'd Actually Use This

Prototyping UI Snippets

Want to quickly test a button style, a card layout, or a navigation bar? Paste your HTML here and see it render instantly. Way faster than creating a new file and opening it in your browser. Great for quick experiments.

Debugging Email Templates

Email HTML is notoriously tricky — inline styles, table layouts, quirky rendering. Paste your email template here to see how it looks before sending it out. Saves you from embarrassing formatting issues.

Learning HTML

If you're learning HTML, this tool is perfect for experimenting. Write some tags, see what they do. Try different attributes, check the result instantly. Much faster than the write-save-refresh cycle.

Reviewing Code Snippets

Someone sent you an HTML snippet on Slack or in a PR comment? Paste it here to see what it actually looks like. No need to create a file, open VS Code, and spin up a server.

Common Questions

Is my HTML data stored anywhere?

No. Everything runs entirely in your browser using JavaScript. Your HTML never leaves your computer unless you explicitly click "Share" to create a link.

Does it support CSS and JavaScript?

Yes. Inline styles and <style> tags render correctly. JavaScript in <script> tags will execute within the sandboxed preview iframe. External stylesheets and scripts referenced via URLs will also load if they're accessible.

Is the preview safe?

The preview renders inside a sandboxed iframe, which isolates it from the main page. This prevents any scripts in your HTML from affecting the tool itself.

Can I use full HTML documents?

Absolutely. You can paste a complete HTML document with <!DOCTYPE html>, <html>, <head>, and <body> tags, or just a fragment like a <div> with some content. The viewer handles both.

How does the live preview work?

As you type in the editor, the tool updates the preview iframe with your HTML content after a short debounce delay (300ms). This gives you real-time feedback without overwhelming the browser with constant updates.

Can I resize the editor and preview panels?

Yes. Drag the splitter bar between the two panels to adjust their sizes. On mobile, the panels stack vertically.

Other HTML & Markup Tools

This viewer is great for previewing HTML, but sometimes you need other things. Here are related tools: