✅ How the Editor Works

The editor uses a simple but powerful approach — your HTML code is written into a sandboxed <iframe> using JavaScript's document.write() method. This means your code is fully rendered just as it would appear in a real browser tab.

  • HTML Editor — Type or paste your HTML code into the dark code editor on the left
  • Run & Preview button — Triggers the updatePreview() JavaScript function
  • Live Preview — The iframe on the right instantly renders your HTML output
  • Edit & Repeat — Make changes and click Run again at any time

🎨 CSS and JavaScript Support

You can write complete HTML pages — including <style> tags for CSS and <script> tags for JavaScript. The preview renders everything just as a real browser would, making this ideal for testing full page layouts, animations, and interactive elements.

👨‍💻 Who Is This Tool For?

This HTML viewer is useful for a wide range of people:

  • Beginners learning HTML for the first time and wanting instant feedback
  • Bloggers testing custom HTML widgets before adding them to their blog
  • Developers quickly testing a snippet without opening a full project
  • Students practicing and experimenting with HTML assignments
  • Designers prototyping simple layouts and components

💡 Tips for Best Results

For the best experience, write your full HTML structure including <html>, <head>, and <body> tags when testing complete pages. For quick snippets, you can paste just the relevant HTML fragment and it will still render correctly in the preview panel.

❓ Frequently Asked Questions

Can I use CSS and JavaScript in the editor? ▼
Yes! You can include <style> tags for CSS and <script> tags for JavaScript. The preview iframe renders a complete HTML page including all styles and scripts.
Is my code saved anywhere? ▼
No. Your code runs entirely in your browser and is never sent to any server. Once you close or refresh the page, the code is gone — so copy it before leaving if you want to keep it.
Does the preview update automatically? ▼
The preview updates when you click the "Run & Preview" button. This gives you control over when to render — useful when writing longer code before previewing.
Can I use external libraries like Bootstrap or jQuery? ▼
Yes! You can include any external CDN links using <link> or <script> tags in your HTML. For example, adding Bootstrap's CDN link will load Bootstrap styles in the preview.
Is this tool free to use? ▼
Completely free — no registration, no login, and no payment required. You can use it as many times as you like with no limitations.