About this tool
Check the viewport tag, zoom, responsive CSS and images, plugins, fixed-width elements and small fonts in a page’s code.
The page is fetched with a phone user-agent and its HTML is read: the viewport meta tag, zoom restrictions, media queries in the page, srcset/picture images, object/embed plugins, inline widths over 600 px and inline font sizes under 12 px.
Example: check Page URL = https://www.php.net/.
This is a code check, not a real-device screenshot. Layout, tap targets and styles in external CSS files are not measured.
Quick steps
- Enter the address of a public page or domain.
- Press Check. The 1CLIK server visits it, which can take a few seconds.
- Read each line — Good, Improve, Problem or Info — with a hint on what to fix.
1CLIK’s server fetches only the public address you enter. Private and internal addresses are refused, and results are cached for a few minutes, not saved to your account.
FAQ
How does the Mobile-Friendly & Responsive Test work?
The page is fetched with a phone user-agent and its HTML is read: the viewport meta tag, zoom restrictions, media queries in the page, srcset/picture images, object/embed plugins, inline widths over 600 px and inline font sizes under 12 px.
What should I keep in mind?
This is a code check, not a real-device screenshot. Layout, tap targets and styles in external CSS files are not measured.
Why can the result differ from what I see in my browser?
The check sees what the server sends to 1CLIK, before any JavaScript runs. Sites can also answer automated requests differently, block them, or vary by country.