Open HTML File Online - HTML Viewer, Editor & Live Preview

Open and preview HTML files online for free. Edit HTML with real-time live preview, format code, and test web pages safely in your browser.

HTML Viewer

1484

Editor

Code

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <style>
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            margin: 0;
        }
        .card {
            background: rgba(255, 255, 255, 0.2);
            backdrop-filter: blur(10px);
            padding: 2rem;
            border-radius: 1rem;
            box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
            border: 1px solid rgba(255, 255, 255, 0.18);
            text-align: center;
            max-width: 400px;
        }
        h1 { margin-top: 0; }
        button {
            background: white;
            color: #764ba2;
            border: none;
            padding: 0.8rem 1.5rem;
            border-radius: 2rem;
            font-weight: bold;
            cursor: pointer;
            transition: transform 0.2s;
        }
        button:hover {
            transform: scale(1.05);
        }
    </style>
</head>
<body>
    <div class="card">
        <h1>Hello World!</h1>
        <p>This is a live preview of your HTML code.</p>
        <button onclick="alert('It works!')">Click Me</button>
    </div>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <style>
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            margin: 0;
        }
        .card {
            background: rgba(255, 255, 255, 0.2);
            backdrop-filter: blur(10px);
            padding: 2rem;
            border-radius: 1rem;
            box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
            border: 1px solid rgba(255, 255, 255, 0.18);
            text-align: center;
            max-width: 400px;
        }
        h1 { margin-top: 0; }
        button {
            background: white;
            color: #764ba2;
            border: none;
            padding: 0.8rem 1.5rem;
            border-radius: 2rem;
            font-weight: bold;
            cursor: pointer;
            transition: transform 0.2s;
        }
        button:hover {
            transform: scale(1.05);
        }
    </style>
</head>
<body>
    <div class="card">
        <h1>Hello World!</h1>
        <p>This is a live preview of your HTML code.</p>
        <button onclick="alert('It works!')">Click Me</button>
    </div>
</body>
</html>

Preview

Live Preview

You May Also Need

HTML to JSON

Convert HTML structure to JSON tree.

Open tool

HTML Minifier/Formatter

Minify or format HTML text with 2/4-space indent.

Open tool

Markdown Viewer & Editor

Preview and edit Markdown with live visualization.

Open tool

XML Viewer Online

Open, view, and format XML files online with tree view and validation.

Open tool

How to Use HTML Viewer?

Type or paste your HTML code into the editor pane.

The preview pane will update automatically to show the rendered result.

Use the toolbar buttons to Copy, Clear, or Toggle Fullscreen.

Key Features

Real-time Preview

Instantly see how your HTML code renders as you type.

Privacy Focused

Your code never leaves your browser. All processing is done locally.

Responsive Design

Use the split-screen view or go full-screen for a better editing experience.

Frequently Asked Questions

How do I open an HTML file online and preview it?

Paste HTML code or load a file, and the rendered preview updates instantly. This makes quick HTML checks and debugging easy.

Can I test external CSS and JavaScript in this HTML viewer?

Yes. Standard external resources can load in preview when allowed by your browser security policies.