Secure HTML & CSS Sandbox

Preview, beautify, and minify HTML & CSS in real time inside a zero-script XSS-protected container.

Zero-Script Sandbox Active1.2 KB / 100 KB Max

HTML & Inline CSS Editor

<div class="card">
  <span class="badge">🛡️ Secure Sandbox</span>
  <h2>Hello from ConvGrid!</h2>
  <p>Edit this HTML & CSS on the left to see instant, XSS-protected live rendering on the right.</p>
  <a href="#" class="btn">Pure HTML & CSS</a>
</div>

Live Isolated Preview

Save clean, sanitized HTML document:

.html

About ConvGrid Secure HTML & CSS Sandbox

Testing untrusted HTML snippets, email templates, or CSS UI components shouldn't put your browser at risk. ConvGrid parses and sanitizes your markup in real time—stripping dangerous <script> tags, inline event handlers, and external frames before rendering inside a zero-privilege sandbox="" iframe.

Key Features

4-Layer XSS Protection: Automatically neutralizes malicious scripts, onerror payloads, and javascript: links
100KB Payload Guard: Prevents browser freezes from oversized code pastes
Responsive Viewport Tester: Preview your layout in Mobile (375px), Tablet (768px), and Desktop modes
1-Click Beautifier & Minifier: Format messy HTML indentation or compress markup for production