HTML Viewer & Editor

Edit HTML and see the realtime result.

HTML / Live Editor

<!DOCTYPE html>
<html>
<head>
<style>
  body { font-family: sans-serif; padding: 20px; }
  h2 { color: #333; }
  .card { background: #fff; padding: 20px; border-radius: 8px; box-shadow: 0 2px 4px rgba(0,0,0,0.1); }
</style>
</head>
<body>

<div class="card">
  <h2>Hello World</h2>
  <p>This is a live preview of your HTML.</p>
  <button onclick="alert('Clicked!')">Click Me</button>
</div>

</body>
</html>

<!DOCTYPE html>
<html>
<head>
<style>
  body { font-family: sans-serif; padding: 20px; }
  h2 { color: #333; }
  .card { background: #fff; padding: 20px; border-radius: 8px; box-shadow: 0 2px 4px rgba(0,0,0,0.1); }
</style>
</head>
<body>

<div class="card">
  <h2>Hello World</h2>
  <p>This is a live preview of your HTML.</p>
  <button onclick="alert('Clicked!')">Click Me</button>
</div>

</body>
</html>

Write HTML, See It Live

Edit HTML, CSS, and JavaScript in the left pane and watch your changes appear instantly in the preview panel on the right. No browser refresh, no local server setup — just pure real-time feedback as you code.

Instant Live Preview

Why Use This Tool?

Zero Setup

No local server or build tool needed. Open the tool and start coding immediately in any browser.

Full HTML5 Support

Write complete HTML documents with embedded CSS and JavaScript. The preview executes scripts and renders all styles.

Mobile Preview Mode

Toggle the preview into a phone-sized frame to test responsive layouts without resizing your browser window.

Private & Secure

All rendering happens inside a sandboxed iframe in your browser. Your code is never sent to any server.

How this HTML Viewer & Editor works

This browser-based HTML editor provides a split-pane interface with a live code editor on the left and an instant preview iframe on the right. As you type HTML, CSS, or JavaScript into the editor, the preview pane refreshes automatically with a short debounce delay so you can see changes in real time without clicking a refresh button.

The tool runs entirely in your browser using the HTML5 iframe sandbox API. Your code is never sent to any external server, giving you a private workspace for prototyping layouts, testing CSS rules, or experimenting with JavaScript interactions. The editor supports full HTML5, modern CSS, and client-side JavaScript including DOM manipulation.

You can switch the preview pane between desktop and mobile viewport sizes to check responsive behavior. The tool is ideal for quick front-end prototyping, teaching HTML fundamentals, testing email template layouts, or verifying how code snippets render without setting up a local development environment.

How to use this HTML Viewer & Editor

Write Code

Edit HTML in the left panel.

Live Preview

See updates instantly on the right.

Test

Interact with your HTML/JS/CSS.

Example Usage

HTML typed in the editor pane renders as a styled heading and paragraph in the live preview without any page refresh.

Input

<h2>Hello World</h2><p style="color:steelblue;">This is a live preview.</p>

Output

Rendered heading and blue paragraph displayed instantly in the preview pane.

Frequently Asked Questions

Does the preview update automatically?

Yes. The preview pane refreshes automatically as you type, with a short debounce delay to avoid unnecessary re-renders while you are mid-edit.

Can I test JavaScript in this editor?

Yes. The preview runs inside a sandboxed iframe that executes client-side JavaScript, so you can test DOM manipulation, event listeners, and animations.

Does it support CSS as well as HTML?

Yes. You can write full HTML documents including embedded style blocks and link tags, and the preview renders all CSS rules correctly.

How do I check mobile layout?

Click the mobile icon in the toolbar to switch the preview pane to a phone-sized viewport, letting you verify responsive design at 375px width.

Is my code saved between sessions?

No. The editor is session-only. Copy your code before closing the tab if you want to keep it.

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The HTML Viewer & Editor is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.

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