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Iframe Tester

Test any URL inside an iframe — preview how a page looks embedded, resize it across mobile, tablet and desktop, and check whether the site allows embedding. Free and private; runs in your browser.

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Laptop · 1366 × 768
Enter a URL and press Load. If the frame stays blank, the site blocks embedding with X-Frame-Options or a Content-Security-Policy: frame-ancestors rule (common for Google, YouTube, banks, etc.). Everything runs in your browser.

What is Iframe Tester?

The Iframe Tester loads any URL inside an <iframe> so you can see how a page behaves when embedded and how it responds at different screen sizes. Switch between mobile, tablet, laptop and desktop presets or set a custom width and height, rotate the viewport, and scale the frame to fit. It also reveals when a site refuses to be embedded — if the frame stays blank, the page is protected by X-Frame-Options or a Content-Security-Policy frame-ancestors rule.

How Iframe Tester works

How to test a page in an iframe

  1. Enter a URL and press Load.
  2. Pick a device preset (Mobile, Tablet, Laptop, Desktop) or type a custom width and height, and use Rotate to swap them.
  3. Watch the page render in the frame; turn on Scale to fit so large viewports fit your screen.

Why some pages stay blank

Many sites send an X-Frame-Options: DENY/SAMEORIGIN header or a Content-Security-Policy: frame-ancestors rule that stops them being shown in an iframe on another domain — Google, YouTube, banks and many apps do this for security. If the frame is blank, that site cannot be embedded. Everything runs locally in your browser.

Common uses

  • Preview how your site looks embedded in an iframe
  • Test a page responsively at mobile, tablet and desktop sizes
  • Check whether a URL allows being embedded (X-Frame-Options / CSP)
  • Debug widgets, embeds and oEmbed previews
  • Demo a responsive layout at exact viewport sizes

Frequently asked questions

How do I test a website in an iframe?
Enter the URL, press Load, then choose a device size or set a custom width and height to see how it renders.
Why is the iframe blank?
The site most likely blocks embedding with X-Frame-Options or a CSP frame-ancestors rule. Such pages cannot be shown in an iframe on another site.
Can I test responsive breakpoints?
Yes — use the device presets or custom dimensions and Rotate to check how the page responds at any size.
Is anything uploaded?
No — the page loads directly in your browser inside the iframe; nothing is sent to our servers.