Responsive Tool

Responsive Tool

Paste a URL to test your website on mobile, tablet, and desktop at the same time — swap any pane's device instantly, no signup, no download.

How it works

Three steps, no setup required.

1
Paste your URL
Drop in your site's link and hit Preview — no signup, no install.
2
Swap any device
Each pane renders the real CSS viewport for that device. Swap it instantly, or enter a custom pixel width.
3
Compare side by side
See phone, tablet, and desktop layouts at once, instead of switching one at a time.

Frequently asked questions

Everything worth knowing before you paste a URL.