HTML Viewer
Render and debug HTML, CSS, and Javascript in real-time. Test responsiveness with built-in device simulation.
What is an HTML Viewer?
An HTML Viewer is an essential development utility that allows web designers, developers, and students to render raw HyperText Markup Language (HTML) code into a visual web page instantly. Unlike a standard text editor, a viewer provides a "What You See Is What You Get" (WYSIWYG) result without needing to save files locally or upload them to a server.
Key Features of This Tool
- Instant Rendering: Paste your code and click "Run" to see the output immediately. The tool creates a sandboxed environment to safely execute your HTML, CSS within
<style>tags, and JavaScript within<script>tags. - Responsive Testing: One of the biggest challenges in web design is ensuring your code looks good on all devices. This viewer includes a unique Device Simulation feature. With a single click, you can toggle the viewport between Desktop, Tablet, and Mobile widths to check if your media queries are working correctly.
- Error Isolation: By isolating snippets of code in this viewer, you can debug specific components (like a navigation bar or a contact form) without the interference of your main website's global styles.
How to Use the HTML Viewer
This tool is designed for speed and simplicity. Follow these steps to get started:
- Input Your Code: Paste your HTML snippet into the left-hand dark editor. You do not need to include the
<html>or<body>tags, though the viewer will accept them if provided. - Add Styling: To style your HTML, simply wrap standard CSS inside
<style>...</style>tags within the same input box. - Simulate Devices: Use the icons in the top-right toolbar (Laptop, Tablet, Phone) to resize the preview frame. This helps you visualize how elements stack or resize on smaller screens.
Why Not Just Use a Browser?
While browsers are the ultimate viewer, the process of "Edit code > Save file > Switch window > Refresh browser" is tedious for rapid prototyping. An online HTML Viewer eliminates these steps, creating a seamless workflow for testing ideas, debugging layout issues, or learning new HTML5 features. It serves as a scratchpad for the web.