HTML Code Runner

HTML Code Runner lets you write, preview, and debug HTML, CSS, and JavaScript directly inside Chrome’s Side Panel — without opening a separate tab or leaving your workflow. This extension is the companion Side Panel experience for HTMLCodeRunner.com. Your code runs locally on your device in a secure sandboxed preview. No login required. What you can do • Write complete HTML documents with embedded CSS and JavaScript • Preview results instantly in a sandboxed live preview pane • Inspect console.log, console.info, console.warn, and console.error output • Catch JavaScript runtime errors without crashing the editor • Copy your code or download it as index.html • Enable Auto Run to refresh the preview as you type • Use dark or light themes, adjustable font size, tab size, and word wrap • Open selected text from any webpage via the “Open in HTML Code Runner” context menu • Jump to HTMLCodeRunner.com or More Tools when you want the full website toolkit Keyboard shortcuts • Ctrl/Cmd + Enter — Run code • Ctrl/Cmd + S — Save code locally • Ctrl/Cmd + Shift + R — Reset to the starter document • Escape — Close dialogs Privacy Your code stays on your device. HTML Code Runner does not upload your source to a server, does not require an account, and does not include analytics or tracking. Preview execution is isolated from Chrome extension APIs. Perfect for • Students learning HTML, CSS, and JavaScript • Developers prototyping quick snippets • Teachers demonstrating browser code live • Anyone who wants a fast Side Panel playground Official website: https://htmlcoderunner.com/