Why mobile landing pages break

Most of your traffic lands on mobile landing pages

Paid traffic from Meta, Instagram and TikTok arrives on a phone, usually inside the app's own browser rather than Safari or Chrome. This webview is smaller than you think, and it gives up screen to its own top and bottom bars. Designers still review mobile landing pages on a 27 inch monitor at full width, sign them off, and never open them on a mid-range Android on hotel wifi. The desktop version is the exception now. Design the phone layout first and let desktop inherit from it.

The hero breaks first

Three columns stack into a tall ribbon of nothing. A headline set at 64 pixels wraps onto six lines and pushes the button off screen. The wide hero image scales down until the product inside it turns into a smudge. Sections spaced at 120 pixels on desktop leave a phone user scrolling through empty gaps. And 100vh sections get clipped by the browser toolbar on iOS, which is what the svh and dvh units were added to fix. Set separate type scales and spacing for the phone breakpoint.

Forms lose people one tap at a time

Apple asks for touch targets of at least 44 by 44 points, and Material Design asks for 48dp. Plenty of mobile CTAs still ship at 32 pixels tall with another link sitting six pixels away. Inputs under 16 pixels make iOS Safari zoom in on focus, which throws the layout sideways. The wrong input type serves a full QWERTY keyboard for a phone number. Then the on-screen keyboard covers the submit button, and your visitor has no idea the form is finished. Set the right input types and autocomplete attributes.

Test on a real phone

Count what covers a phone screen on a typical page: a sticky header, a cookie banner, a promo bar, a chat bubble in the corner and a sticky footer CTA. Together they can take a third of the viewport before any content appears. Pick one persistent element and drop the rest. Then load the page on your own phone, over mobile data, from the actual ad link, inside the app's in-app browser. Chrome device emulation will not show you a webview toolbar or a slow network.