HTML Online Editor

Edit HTML code with live preview and console output in a powerful online editor

About HTML Online Editor

Overview

HTML Online Editor is a powerful browser-based tool for writing, editing, and previewing HTML code in real-time. This editor provides a professional development environment with syntax highlighting, live preview, and console output monitoring. Perfect for web developers, students, and anyone learning HTML, CSS, and JavaScript. All processing happens locally in your browser, ensuring your code remains private and secure.

Features

  • Monaco Editor with HTML, CSS, and JavaScript syntax highlighting
  • Live preview with real-time rendering in secure iframe
  • Console output capture showing logs, warnings, and errors
  • Three view modes: Editor only, Preview only, or Split view
  • Fullscreen mode for immersive editing experience
  • File upload and download functionality
  • Copy to clipboard with one click
  • Drag and drop file support
  • Completely browser-based - no server uploads
  • Dark mode support with automatic theme detection
  • Auto-closing tags and IntelliSense
  • Mobile-responsive design

How to Use

  1. Write or paste your HTML code in the Monaco editor on the left
  2. Click "RUN HTML" to see the live preview in the right panel
  3. View console.log() outputs and JavaScript errors in the Console Output section
  4. Switch between Editor, Preview, or Split View modes using the view mode buttons
  5. Use fullscreen mode for distraction-free editing and preview
  6. Upload HTML files or download your code for later use

FAQ

How does the live preview work?

The live preview renders your HTML code in a sandboxed iframe element. When you click "RUN HTML", the editor content is injected into the iframe using the srcdoc attribute. This provides instant preview while maintaining security by isolating the preview content from the main application.

Can I see JavaScript console.log() outputs?

Yes! The editor captures all console methods including log, warn, error, and info from the preview iframe. These are displayed in the Console Output panel below the editor. This allows you to debug your JavaScript code without opening browser developer tools.

Is my code sent to any server?

No, all code editing and preview happens entirely in your browser. Your HTML code is never uploaded to any server, ensuring complete privacy. The editor works offline once loaded, making it perfect for sensitive projects and secure environments.

What view modes are available?

The editor offers three view modes: Editor only for focused coding, Preview only to see the rendered output fullscreen, and Split View to see both code and preview side by side. You can also enable fullscreen mode for any view for a distraction-free experience.

Does it support external libraries like Bootstrap or jQuery?

Yes! You can include external CSS and JavaScript libraries using standard HTML link and script tags with CDN URLs. The preview iframe has full internet access, allowing you to use any external resources like Bootstrap, jQuery, Font Awesome, or custom web fonts.