Free HTML sandbox

Paste HTML, CSS, and JavaScript, press Run, and watch it execute in an isolated preview — no setup, no local server, nothing stored.

An HTML sandbox is an isolated environment where you can run HTML, CSS, and JavaScript safely: the code executes inside a sandboxed browser frame that can’t touch your files, cookies, or the page around it. Paste your code below and press Run to see the result instantly.

Editor · HTML + CSS + JS

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <title>HTML sandbox</title>
    <style>
      body {
        margin: 0;
        font-family: system-ui, sans-serif;
        background: #0f172a;
        color: #e2e8f0;
        min-height: 100vh;
        display: grid;
        place-items: center;
        text-align: center;
      }
      #count { margin: 0; font-size: 3.5rem; font-weight: 700; font-variant-numeric: tabular-nums; }
      .hint { margin: 1rem 0 0; color: #94a3b8; font-size: 0.85rem; }
      button {
        margin-top: 1.25rem;
        border: 0;
        border-radius: 999px;
        padding: 0.65rem 1.6rem;
        font: 600 1rem system-ui, sans-serif;
        background: #f97316;
        color: #fff;
        cursor: pointer;
      }
      button:active { transform: scale(0.97); }
    </style>
  </head>
  <body>
    <div>
      <p id="count">0</p>
      <button id="add">Click me — JS runs here</button>
      <p class="hint">Edit the code on the left, press Run, watch it change.</p>
    </div>
    <script>
      var n = 0;
      document.getElementById('add').addEventListener('click', function () {
        n += 1;
        document.getElementById('count').textContent = n;
      });
    </script>
  </body>
</html>

Result sandboxed frame · scripts isolated

Runs entirely in your browser — we don’t store what you paste. Code works? Turn it into a shareable URL →

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What people run here

A safe place to try code you didn’t write yet — or didn’t write at all

Check AI-generated code

Claude or ChatGPT handed you a block of HTML? Run it here before you trust it — see exactly what it renders and what its scripts do, isolated from everything else.

Experiment with CSS & layout

Try a grid, an animation, a one-off style fix. The sandbox renders a full document, so what works here works in a real browser tab.

Test JS snippets safely

Event handlers, DOM manipulation, little widgets — scripts execute inside the isolated frame, with no access to your cookies, files, or this page.

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The next step

When the experiment works, ship it as a real page

A sandbox is for finding out whether the code works. The moment it does, you usually need a link — for a client, a teammate, or your own phone. Pagelive turns the same HTML into a live page: noindex by default, optionally password-protected, with opens and time-on-page tracking built in. You can even publish straight from Claude.

Turn it into a URL

Convert the working code into a clean, shareable pagelive.site link in one step — free, no signup.

HTML to URL → →

Host it properly

Publish with view analytics, version history, and optional passwords — a link that reports back when it’s opened.

Publish HTML → →

Grow it into a website

Going past one experiment? Take the same HTML to a full site — your structure, your domain.

HTML to website → →

Free keeps 10 pages live · Pro is $15/mo or $150/yr →

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HTML sandbox FAQ

Is the HTML sandbox free? +

Yes. Run as much HTML, CSS, and JavaScript as you like — no signup, no limits, nothing to install.

Does it run JavaScript and CSS? +

Yes. The sandbox renders a complete HTML document, so markup, inline styles, style blocks, and script tags all execute exactly as a browser would run them.

What does “sandboxed” actually mean? +

Your code runs inside an isolated browser frame with a strict sandbox policy: scripts are allowed, but the frame can’t read your cookies, touch your files, navigate this tab, or reach anything outside itself. That isolation is what makes it a safe place to try code.

Do you store my code? +

No. The sandbox runs entirely in your browser — nothing you paste is sent to or stored on a server. Code only leaves your machine if you choose to publish it as a page.

How do I share what I built? +

Publish it as a real link. Anonymous pages stay live for 7 days; claim with a free account to keep the URL forever. Published pages are noindex by default, can be password-protected, and report opens, unique viewers, and time on page.

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From sandbox to a live link.

Drop the working HTML and get a shareable, tracked URL in seconds — free, no signup, noindex by default.

Publish your page See pricing