🖼 HTML Paste Preview

Paste HTML and render it instantly in a sandboxed iframe on the right. Perfect for HTML email mockups, Outlook compatibility, and device-width testing.

✅ 100% free · no signup · nothing sent to a server

🔒 Privacy and Security

・Rendering happens in a local sandboxed iframe (sandbox=allow-same-origin)
・Script tags are NOT executed (disabled by sandbox)
・Your HTML text is never sent to any server
・No external libraries — pure JavaScript

📝 HTML Input

📁 File

0 chars

👁 Preview

BG:

📖 How to Use

1

Paste HTML

Paste HTML into the textarea on the left, or load an .html file.
2

Select device width

Choose Desktop, Tablet, Email 600, or Mobile 375 to check responsive layout.
3

Switch background

Toggle white, dark, or checker. White is standard for HTML emails.

❓ FAQ

Do script tags run?

No. The iframe sandbox (allow-same-origin only) blocks scripts so untrusted HTML can be previewed safely.

Can I preview HTML email?

Yes. Use the Email 600 preset with white background for an email-client-like layout. Always test in real clients (Outlook, Gmail) for final QA.

Is the HTML sent to your server?

No. Rendering happens in a local iframe in your browser. There is no server endpoint.

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🐛 Found a bug or issue with this tool?

Free to use, no signup. Even just the steps to reproduce are helpful. Reports go directly to the operator and help us fix issues.