Live Code Playground
Write HTML, CSS and JavaScript and see the result instantly in a professional split-screen live preview
What is the Fastols Live Code Playground?
This tool lets you write HTML, CSS, and JavaScript code in separate editors, with a live preview of the result in an independent frame, and a space to display console.log messages from your code.
The code you write is automatically saved in your browser, so it stays there when you reopen the page from the same device and browser.
Code Runs in Your Browser Only
HTML, CSS and JS execute locally in the sandboxed preview — nothing is uploaded.
Live Preview as You Type
See your rendered output update instantly with every keystroke.
No Sign-up to Start Coding
Open the playground and start testing snippets immediately, for free.
How to Use the Live Code Playground
- 1Write your HTML code in the HTML tab, your styling code in the CSS tab, and your programming code in the JS tab.
- 2Click the "Run" button to execute the code and see the result in the preview.
- 3Check any console.log messages that appear in the dedicated Console area below the editor.
- 4Click "Reset" to go back to the default code whenever you need to.
Frequently Asked Questions about the Live Code Playground
Is the code I write saved after I close the page?
Yes, the code is automatically saved in your browser's local storage and reappears when you reopen the page from the same browser and device.
Where do the console.log messages from my JavaScript code appear?
These messages appear in the dedicated Console area inside the tool, with a counter showing the number of messages displayed.
What does the "Reset" button do?
The "Reset" button replaces the current code in all three editors with ready-made sample default code.
Does the JavaScript code run inside an independent frame?
Yes, the preview is displayed inside an independent iframe separate from the rest of the page's elements, so the code runs in its own environment.
Is the code I write sent to any server?
No, the code runs entirely within your browser and is only saved in the browser's own local storage, never uploaded to any server.