HTML Previewer

HTML Previewer

 

Write, preview and test HTML, CSS and JavaScript directly in your browser. This free online HTML Previewer features separate code editors, a live preview, responsive screen sizes, HTML file import and download. No installation required.

Live previewReady

Your code stays in your browser. The preview runs in an isolated sandbox and cannot access your WordPress page. External resources may require an internet connection.

 

Tutorial

The HTML Previewer lets you write and test HTML, CSS and JavaScript directly in your browser. You can see how your code looks in real time, test different screen sizes and download your finished work as an HTML file.

1. Open the HTML Previewer

Open the tool in your browser. The editor contains three separate sections:

  • HTML: Add your page structure and content.
  • CSS: Control colors, fonts, spacing and layout.
  • JavaScript: Add interactive features and functionality.

A starter example is already included so you can begin experimenting immediately.

2. Write or Edit HTML

Use the HTML editor to create your page structure. You can add headings, paragraphs, images, links, buttons and other HTML elements.

For example:

<h1>My First Website</h1>
<p>Welcome to my website!</p>

3. Add CSS Styling

Switch to the CSS editor to customize the appearance of your page.

You can change:

  • Background colors
  • Text colors and fonts
  • Margins and padding
  • Element sizes
  • Borders and rounded corners
  • Page layouts

Changes become visible when you update the preview.

4. Add JavaScript

Use the JavaScript editor to add interactive functionality.

For example, you can create button actions, simple calculations, dynamic content and other browser-based features.

5. Run the Live Preview

Click Run Preview to display your HTML page.

The preview runs in a separate area, allowing you to compare your code with the rendered result.

Click the button again whenever you want to apply your latest changes.

6. Test Responsive Layouts

Use the preview width selector to test your page at different screen sizes.

Available options include:

  • Responsive
  • Desktop
  • Tablet landscape
  • Tablet portrait
  • Mobile
  • Small mobile

This makes it easier to identify layout problems before publishing your website.

7. Import an Existing HTML File

Click Import HTML and select an HTML file from your computer.

The tool will attempt to separate embedded HTML, CSS and JavaScript into the corresponding editors. Review the imported code before continuing.

8. Download Your HTML File

When you are happy with your result, click Download HTML.

The tool combines your HTML, CSS and JavaScript into one downloadable HTML document that you can save and open in your browser.

Tips

  • Keep your HTML, CSS and JavaScript organized.
  • Test your page at several screen sizes.
  • Use simple examples when learning new HTML elements.
  • Remember that external images, fonts and libraries may require an internet connection.
  • Download your work regularly to keep a local copy.

Your code is processed in your browser. The preview runs in an isolated sandbox.

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