Our free HTML Real-time Live Editor provides a split-screen in-browser coding workspace to write, edit, and test HTML5 markup, inline CSS styles, and JavaScript scripts in real-time. Designed for web developers, frontend designers, and students, it features an instant sandboxed iframe preview canvas that updates as you type. Test responsive layouts effortlessly with the built-in Device Viewport Switcher (Desktop 100%, Tablet 768px, Mobile 375px), clean up markup with the integrated HTML Beautifier & Minifier tools, or choose from pre-built layout templates (Hero Page, Pricing Cards, Contact Form). Operating 100% client-side in secure local JavaScript, your code is never saved or transmitted to external servers.
Type HTML5 markup into the editor pane, load a sample preset (like Hero Page or Pricing Cards), or upload a local .html file.
Observe real-time page rendering in the iframe sandbox and switch between Desktop, Tablet, and Mobile viewports.
Click 'Beautify' to clean up formatting, then copy the HTML code or download index.html directly.
Renders HTML tags, inline CSS styles, and JavaScript scripts in a clean, isolated iframe element with immediate DOM execution.
Switch seamlessly between Desktop (100%), Tablet (768px), and Mobile (375px) frame widths to verify media queries and layout breakpoints.
All code editing, iframe rendering, and file downloads execute locally in your browser. No code, styles, or scripts are ever sent to external servers.
The HTML Real-time Live Editor utilizes a client-side <iframe> document stream. When code updates occur, doc.open() and doc.write() re-hydrate the isolated DOM context without triggering full parent window page reloads.
Responsive Viewport Emulation adjusts container width geometry (Desktop 100%, Tablet 768px, Mobile 375px), allowing developers to test media query breakpoints (@media (max-width: 768px)) live.
The in-browser code formatter uses a non-destructive regex tokenizer to balance tag opening and closing indents, producing clean production-ready HTML code blocks.