Code Snippet Playground — Live HTML, CSS & JS Preview
Three separate editors — HTML, CSS, and JavaScript — with a sandboxed live preview that updates in real time as you type. No run button, no backend, no signup. The perfect front-end prototyping tool for quick snippets.
Write snippets and watch preview update in real time.
Included Editor Panels
HTML Editor
Write or paste HTML markup with automatic tag and closing behavior.
CSS Editor
Add styles in a dedicated CSS panel applied live to your HTML output.
JavaScript Editor
Write JS logic that runs directly inside the sandboxed preview iframe.
Live Preview
Sandboxed iframe updates in real time as you type — no run button needed.
How to Use the Code Playground
Write your HTML
Type or paste HTML into the HTML editor panel. The preview updates instantly as you type.
Add CSS styles
Switch to the CSS panel and style your elements — changes apply live to the preview.
Add JavaScript
Open the JS panel to add interactivity. Scripts run inside a sandboxed iframe with no access to your page.
Load a sample
Click 'Load sample' to see a prebuilt demo with a styled card and click counter, then remix it.
Frequently Asked Questions
- Is this a CodePen alternative?
- Yes. ToolMint's Code Snippet Playground provides the same HTML/CSS/JS split-pane live preview experience, entirely in your browser with no login required.
- Does the JavaScript run securely?
- Yes. The preview iframe is sandboxed with allow-scripts only — no cookies, no form submission, no same-origin access. Your page and the preview are fully isolated.
- Does the preview auto-update as I type?
- Yes. There is no Run button — the iframe re-renders as you type in any of the three editors.
- Can I load external libraries like jQuery or Tailwind?
- Yes. Add a script src or link rel=stylesheet tag in the HTML editor to pull in any CDN-hosted library.
- Is my code saved between sessions?
- The code is kept in memory while the tab is open. Refresh or close the tab to start fresh.