VoriTools

HTML, CSS and JavaScript Runner

Write or paste page code and run the preview. The new window executes the supplied JavaScript, so use code you trust.

Runs locally in your browser

How to run HTML, CSS and JavaScript in the browser

Paste HTML with CSS and JavaScript into the editor and press Preview output: the code opens in a new browser window where the markup is rendered and the scripts run. It is a quick way to watch a snippet, a layout change or a small DOM script behave in a real browser without creating a file or starting a local server.

The pasted page runs inside a sandboxed frame, separated from this site. Scripts execute and dialogs work, but the code cannot read this page's storage or DOM, and nothing you type is uploaded — the preview happens entirely in your browser.

  1. Paste or type your code into the editor: a full HTML document, or a fragment such as a div with a style block and a script block.
  2. Press Preview output. A new window opens with the rendered page; if the browser blocks pop-ups, the page says so instead — allow pop-ups for voritools.com and press the button again.
  3. Reach for Select all, Copy and Clear while you iterate: Select all marks the whole editor, Copy puts it on the clipboard, and Clear empties the box so you can start over.
  4. Close the preview window when you are done; the code and the preview are not saved anywhere, so keep your own copy of anything you want to reuse.

What happens when you press Preview output

How the preview is isolated

The preview window loads your code into an iframe whose sandbox attribute is set to allow-scripts, allow-modals, allow-forms and allow-popups. Scripts therefore run, dialogs (alert, confirm, prompt) and form controls work, and links can open further windows, while the frame itself is treated as an opaque origin.

That opaque origin is the important part: a page inside the sandbox cannot reach the parent document or read this site's localStorage, so code pasted from an unfamiliar source cannot touch your VoriTools tab. It also cannot navigate this page away; whatever it does stays inside its own frame.

What you can check with it

For the code you give it, the preview behaves like a browser tab: the HTML is parsed, the CSS applies, inline and external scripts run, and DOM changes are visible immediately. Resizing the preview window is a practical way to watch media queries and flexible layouts adapt.

The tool adds no error console of its own: when a script throws, you see the result a normal browser page would show, which is often a blank or half-rendered frame. That makes the preview good for a quick sanity check, and the browser's own developer tools the place to look when something fails.

Limits, privacy and practical notes

Nothing is sent to VoriTools: the code is parsed and executed by your browser and no request carries it. There is also no server-side execution, so PHP, Python or database code will not run here.

The editor is plain by design — no syntax highlighting, file loading or history — and refreshing the page clears it. Code that depends on cookies or localStorage finds no stored session in the sandboxed preview, and if the pop-up blocker stops the window, the page shows a message instead of the preview.

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