How to Run HTML Code Online

Steps

1. Open the HTML CSS JS compiler.
2. Paste HTML into the HTML pane.
3. Add CSS and JavaScript if needed.
4. Click Run or press Ctrl/Cmd + Enter.
5. Inspect the preview and console.

Example

Sample — Run

HTML

<button id="demo">Hello</button>

CSS

#demo { padding: 12px 24px; color: white; background: #2563eb; border: 0; border-radius: 8px; }

JavaScript

document.getElementById("demo").addEventListener("click", () => console.log("Hello"));

Paste each block into its matching pane and click Run. You should see a blue button. Clicking it writes Hello to the console. Download exports the HTML, CSS and JavaScript together; it does not create a hosted URL.

Tip

If the preview is blank, confirm Run was triggered and that your HTML pane is not empty.

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