About iFrame Test

iFrame Test is a simple, visual tool that helps developers and website owners understand whether a website can be embedded in an iframe. Instead of checking HTTP headers manually or reading documentation, you can simply test any URL and see the result instantly.

Why This Tool Exists

Many websites block iframe embedding for security and user experience reasons. When building web applications that need to embed external content, developers often encounter mysterious errors or blank iframes without clear explanations.

This tool provides immediate visual feedback. If you see the website content in the iframe, it works. If you see an error page or blank space, it's blocked. No need to inspect network requests or read technical headers—the result speaks for itself.

How It Works

1. Enter a URL: Type any website address into the input field.

2. Live Embedding Test: The tool attempts to load the URL in an iframe with standard security settings (sandbox attributes for safety).

3. Visual Result: You immediately see whether the site loads successfully or displays an error. This is the most reliable test because it shows exactly what would happen in a real-world scenario.

Technical Background

X-Frame-Options Header

This HTTP response header tells browsers whether a page can be displayed in an iframe. Common values include:

DENY - Never allow framing
SAMEORIGIN - Only allow same domain
ALLOW-FROM uri - Allow specific domains (deprecated)

Content Security Policy (CSP)

The frame-ancestors directive is the modern replacement for X-Frame-Options. It provides more flexibility and allows specifying multiple allowed domains.

JavaScript Framebusting

Some websites use JavaScript to detect if they're loaded in an iframe and automatically break out or redirect. This is common on banking and social media sites for security reasons.

Common Use Cases

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Web Developers: Check if external content can be embedded before building features

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Content Creators: Verify if your site allows embedding for sharing purposes

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Security Auditors: Test if security headers are properly configured

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Educators: Demonstrate iframe security concepts with live examples

Technology Stack

Framework:

Nuxt 4 + Vue 3

Styling:

Tailwind CSS

Language:

TypeScript

Icons:

Heroicons

Ready to test iframe embedding?

Start Testing