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HTML Previewer

Paste or type HTML and see a live preview instantly. Supports CSS, JavaScript, and responsive viewport testing.

HTML Editor Line 1
1
Preview Desktop
ℹ️ How to use
  1. Type or paste your HTML code (with optional CSS/JS) in the editor
  2. Click Run to render — or enable Auto for live preview
  3. Switch between Desktop / Tablet / Mobile viewports
  4. Tab key inserts 2 spaces instead of switching focus
  5. Click ↗ Tab to open the full preview in a new browser tab

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❓ Frequently Asked Questions

What is an HTML previewer?

An HTML previewer renders HTML code in a live browser preview so you can see how it looks without saving a file or setting up a local server. It is useful for quickly testing HTML snippets, email templates, landing page layouts, and CSS experiments.

Can I include CSS and JavaScript in the preview?

Yes. You can write a complete HTML document with <style> tags for CSS and <script> tags for JavaScript. The preview iframe renders it exactly as a browser would, including JavaScript execution.

Is the HTML I enter stored anywhere?

No. Your HTML code is processed entirely in your browser and is never sent to any server. Each preview runs inside a sandboxed iframe on your own device.

What is the difference between HTML and HTML5?

HTML5 is the latest version of HTML, introduced in 2014. It adds semantic elements (header, footer, article, nav), native video and audio support, the Canvas API for drawing, offline storage, and geolocation. Modern browsers support HTML5 by default. This previewer renders HTML5.

Can I test responsive design with this tool?

Yes. Use the Desktop (full width), Tablet (768px), and Mobile (375px) viewport buttons to preview how your HTML layout behaves at different screen sizes. This is useful for testing responsive CSS with media queries.