About HTMLOnlineViewer.com

HTMLOnlineViewer.com is the internet's most secure and user-friendly tool for previewing HTML code online. Whether you're a web developer testing code snippets, a student learning HTML, or a designer prototyping layouts, our tool provides instant, safe HTML preview with advanced security measures to protect against malicious code.

Our Mission

We believe that testing and previewing HTML code should be safe, fast, and accessible to everyone. Our mission is to provide the most secure HTML preview experience on the web, completely free of charge, with robust protection against XSS attacks and malicious code while maintaining full functionality for legitimate HTML content.

Key Features

• Secure Sandbox Environment: All HTML is rendered in a secure, isolated environment
• XSS Protection: Automatic removal of potentially dangerous scripts and event handlers
• Real-time Preview: See your HTML rendered instantly as you type
• Multiple View Modes: Split view, code-only, or preview-only modes
• File Upload/Download: Upload HTML files or download your code
• Copy Functionality: Easily copy your HTML code to clipboard
• Sample Templates: Pre-built examples to get you started quickly
• Mobile Responsive: Works perfectly on all devices and screen sizes
• No Registration Required: Start using immediately without signing up
• Client-Side Processing: All processing happens in your browser for privacy

Security First Approach

Security is our top priority. Our HTML viewer implements multiple layers of protection including Content Security Policy (CSP) headers, automatic script removal, event handler sanitization, and sandboxed iframe execution. This ensures that you can safely preview HTML code without risk of XSS attacks or malicious code execution.

Who Uses Our Tool?

Privacy & Data Protection

Your privacy is important to us. All HTML processing happens entirely in your browser - no code is sent to our servers. This means your HTML content remains completely private and secure. We don't store, analyze, or have access to any of the code you preview in our tool.

Technology Stack

Our HTML viewer is built using modern web technologies including React, Next.js, and TypeScript. We use advanced security measures like Content Security Policy headers and sandboxed iframes to ensure maximum security while maintaining excellent performance and user experience.

Continuous Improvement

We're constantly working to improve our HTML viewer with new features, enhanced security measures, and better user experience. Our tool is regularly updated to stay current with web standards and security best practices.

Get Started

Ready to start previewing HTML code securely? Head back to our main page and begin testing your HTML immediately. No registration required, no downloads needed - just paste your code and see the results instantly.