Online HTML Viewer

           \n`;
}
} else {
filename = 'document.txt';
contentType = 'text/plain';
}
downloadFile(content, filename, contentType);
showStatus('File downloaded as ' + filename);
} catch (err) {
showStatus('Error downloading file: ' + err.message, 'error');
}
});document.getElementById('wp-htmlFileUpload').addEventListener('change', function(e) {
const file = e.target.files[0];
if (!file) return;
// Reset file input to allow re-uploading the same file
this.value = '';
const reader = new FileReader();
reader.onload = function(e) {
try {
let content = e.target.result;
// Preserve original formatting by not automatically beautifying
htmlEditor.setValue(content);
// Set indentation based on first line's indentation if possible
const firstLine = content.split('\n')[1] || '';
const match = firstLine.match(/^(\s+)/);
if (match) {
const indentSize = match[1].length;
if ([2,4,6,8,10].includes(indentSize)) {
document.getElementById('wp-htmlIndentation').value = indentSize;
}
}
showStatus(`File "${file.name}" loaded successfully (${(file.size/1024).toFixed(2)} KB)`);
// Automatically show preview
previewBtn.click();
updatePreview();
} catch (err) {
showStatus('Error loading file: ' + err.message, 'error');
}
};
reader.onerror = function() {
showStatus('Error reading file', 'error');
};
// Check file size (limit to 2MB)
if (file.size > 2 * 1024 * 1024) {
showStatus('File too large (max 2MB)', 'error');
return;
}
reader.readAsText(file);
});document.getElementById('wp-htmlLoadUrlBtn').addEventListener('click', function() {
const url = document.getElementById('wp-htmlUrl').value.trim();
if (!url) {
showStatus('Please enter a URL', 'error');
return;
}
// Add http:// if missing
let fetchUrl = url;
if (!/^https?:\/\//i.test(url)) {
fetchUrl = 'http://' + url;
}
showStatus('Loading HTML from URL...');
fetch(fetchUrl)
.then(response => {
if (!response.ok) {
throw new Error(`HTTP error! status: ${response.status}`);
}
return response.text();
})
.then(html => {
htmlEditor.setValue(html);
showStatus('HTML loaded from URL successfully');
previewBtn.click();
updatePreview();
})
.catch(err => {
showStatus('Error loading HTML from URL: ' + err.message, 'error');
});
});// Auto-update preview on changes with debounce
let updateTimeout;
htmlEditor.on('change', function() {
clearTimeout(updateTimeout);
updateTimeout = setTimeout(updatePreview, 1000);
});// Initialize with preview mode
previewBtn.click();
// Add keyboard shortcut for beautify (Ctrl+Alt+B)
document.addEventListener('keydown', function(e) {
if (e.ctrlKey && e.altKey && e.key === 'b') {
e.preventDefault();
beautifyHTML();
}
});
});

HTML Viewer Online is a free tool that lets users format, view, and beautify HTML code with ease. Whether you’re a developer, student, or curious beginner, this online HTML viewer provides a clean and simple way to preview and edit your HTML code. Copy, Paste, Upload, and View HTML instantly—no installation required.
The tool is designed to help users analyze HTML code, debug structure, and understand how a webpage is built, all within a live preview interface.
What is HTML Viewer Online?
HTML Viewer Online is an online utility that displays raw HTML content in a structured and readable format. It supports HTML beautification, syntax highlighting, indentation, and real-time HTML preview rendering. It’s useful for checking HTML files, learning HTML tags, or verifying the layout before publishing.
Whether you have copied code, a file, or a URL, this tool lets you view the final rendered HTML output without needing a browser console or code editor.
Key Features of HTML Viewer
HTML Viewer and Editor
This tool offers a dual-panel layout where users can paste or type HTML in one panel and instantly preview the result in the second panel. It behaves like a basic HTML IDE, with the bonus of being lightweight and online.
HTML Beautifier
The HTML Beautifier feature helps reformat minified or messy HTML code into a properly indented, readable structure. It’s helpful when working with code copied from other sources or when debugging large HTML documents.
Upload HTML Files
You can upload your HTML files from your computer using the “Upload” button. The viewer will instantly display the formatted and rendered HTML output.
URL HTML Viewer
Have a public URL pointing to HTML page? Paste it into the tool, and it will fetch the source code and render it in the preview window. It’s a great way to inspect and learn from live websites.
Share & Save
After viewing or editing HTML, you can copy the beautified code, save it locally, or share it with others. It’s a way to collaborate or archive a snippets for later.
Why Use HTML Viewer Online?
  • No installation or signup required
  • Works directly in your browser
  • Supports file uploads and URL fetches
  • Helps debug HTML quickly
  • Great for education, learning, and testing
  • 100% free and easy to use
How to Use HTML Viewer Online?
Follow these simple steps to get started:
1. Paste HTML Code
Copy your HTML content and paste it into the Input Editor on the left side. It will format and highlight automatically the code.
2. Upload HTML File
Use “Upload File” button for uploading an .html file from your system. The viewer reads the file using your browser and shows both the code and output.
3. Load from URL
Click on the “URL” button and paste the link to any publicly accessible HTML page. The tool will fetch the page, extract the HTML, and display the output in real-time.
4. Click Run / View
Once your HTML is in the input editor (via paste, file, or URL), click on the “Run / View” button to render the output.
How Does HTML Viewer Work?
HTML Viewer uses JavaScript to display HTML code in the browser. It processes code in real-time without sending it to any server (for paste and file inputs).
When uploading a file, your browser reads it locally using FileReader, ensuring your privacy. If you paste a URL, the tool makes a secure request to fetch the HTML and render it.
The viewer is fast, lightweight, and does not save any personal data.
Supported Platforms and Browsers
HTML Viewer Online works seamlessly on:
  • Windows
  • macOS
  • Linux
  • Android
  • iOS
It supports all major modern browsers:
  • Google Chrome
  • Mozilla Firefox
  • Safari
  • Microsoft Edge
  • Opera
No plugins, extensions, or downloads are required.
Use Cases for HTML Viewer
Code Review
Easily review HTML code sent by your team, clients, or downloaded from the web.
Education & Learning
Use it as a sandbox to learn HTML tags, structure, and page behavior.
Debugging
Fix HTML formatting issues by visualizing how the page renders and cleaning up tags.
Web Design
Preview static HTML pages before uploading them to your server or CMS.
SEO Optimization
Check if tags like <title>, <meta>, <h1>, etc., are properly structured.
What Can You Do With HTML Viewer?
  • View and format HTML code
  • Test HTML before publishing
  • Beautify and indent messy HTML
  • Preview HTML emails or templates
  • Inspect HTML structure of external sites
  • Clean up minified code
  • Learn HTML with real-time results
  • Copy or download formatted code
  • Share beautified code with teammates
HTML Viewer
Try the HTML Viewer with This Example
Here’s a sample HTML snippet you can paste into the viewer to see how it works:
<!DOCTYPE html>
<html>
  <head>
    <title>My Sample Page</title>
  </head>
  <body>
    <h1>Welcome to My Website</h1>
    <p>This is a text are with a <strong>bold</strong> text and <a href="#">a link</a>.</p>
    <ul>
      <li>Home</li>
      <li>About</li>
      <li>Contact</li>
    </ul>
  </body>
</html>
Just paste it and see the formatted result.
Frequently Asked Questions (FAQs)
Is HTML Viewer Online free?
Yes, it’s completely free to use. No registration or payment is needed.
Is my code stored or shared?
No. All HTML code processed through this tool stays in your browser. We don’t store or transmit any of your data unless using the URL feature.
Can I view CSS or JavaScript too?
This tool is focused on HTML. While inline CSS and JS will appear in the output, for a full experience, use it alongside CSS Viewer or JS Beautifier.
Tips for Best Results
  • Always close HTML tags properly to avoid a rendering issues.
  • Use consistent indentation for better readability.
  • Include basic structure (<!DOCTYPE html>, <html>, <body>) for accurate previews.
  • Check mobile responsiveness with media queries if needed (not fully simulated in this tool).
  • Test your emails and newsletters in the viewer before sending.
HTML Viewer Online is a reliable, fast, and intuitive tool for anyone working with HTML code. Whether you’re editing a landing page, studying web development, or fixing a broken tag, this tool will simplify your workflow.
No need to install any software or open a bulky code editor—just open the tool, paste your code, and see it in action.
Give it a try today and make your HTML work faster, cleaner, and better.
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