Responsive Design Tester

Runs in your browser — nothing is uploaded

URL

Device

About this tool

Loads your URL in an iframe sized to a common device viewport. Many sites block being framed by other domains (X-Frame-Options / Content-Security-Policy: frame-ancestors) — if the preview stays blank, that's the target site's own security header, not a bug here. Your own pages will usually work fine.

Frequently asked questions

What is Responsive Design Tester?

Preview a URL at common device viewport sizes. It is one of the Browser & Device tools on MyCodeTips.

How do I use Responsive Design Tester?

Open the tool, enter or paste your input, and the result appears right away. Use the Copy button to copy it.

Is Responsive Design Tester free to use?

Yes. It is free to use and does not need an account.

Is my data safe with Responsive Design Tester?

Yes. It runs entirely in your browser, so what you enter is never uploaded to our servers.

Can I share my result?

Yes. Use the share buttons below the tool to post a link or copy a link to the tool page.