Live HTML, CSS & JavaScript Editor
Type in the three panes and the preview updates as you go. Console output and errors show underneath.
Is it safe to run my code here?
The preview runs inside a sandboxed frame, separate from this page, so your code can’t touch ToolBench or read anything from it. Nothing you type is uploaded — it stays in your browser. Because the frame is sandboxed, features that need a real origin (like localStorage or cookies) won’t work inside the preview.
About the Live HTML, CSS & JavaScript Editor
The Live HTML Editor lets you write HTML, CSS and JavaScript in separate panels and see the result immediately in a preview, with a console that shows errors and console.log output. It is a quick place to learn, test snippets and prototype small ideas without creating files.
The preview runs your code in an isolated frame inside the page, so your code cannot access this site's data. You can download the result as a single .html file or copy the full HTML. The editor starts with an example, and Reset example restores it. Remember that external resources such as images and scripts load only if their servers allow it.
How to use it
- Write HTML body content in the first panel.
- Add styles in CSS and behaviour in JavaScript.
- Press Run to update the preview and check the console.
- Use Download .html or Copy full HTML to keep your work.
Tips and good to know
- Look in the console first when something does not work.
- Save your work often; the editor does not store it.
- Start with small examples and build up.
Frequently asked questions
Is it safe to run my code?
The code runs in a sandboxed frame in your browser.
Can I use libraries?
You can add a script tag that points to a library.
Does it save my code?
No; download it to keep it.