Mobile Readiness Check
Paste a URL. It checks the things that break a Webflow site on a phone but look fine on a desktop canvas: a missing or locked viewport, fixed widths wider than the screen, tap targets too small to hit, and text below the size where phones start zooming.
What it checks
Viewport and overflow
A missing viewport meta, user-scalable disabled, and any element with a fixed width or min-width wider than a 375px screen. Those are what cause the sideways scroll you only notice on a real phone.
Tap targets
Links and buttons styled below the 44px that thumbs need, and links sitting so close together that the wrong one gets tapped. Footers and icon rows are the usual offenders.
Text and inputs
Body text under 16px, inputs under 16px that make iOS zoom the whole page on focus, and inputs with no type or inputmode, so phones show the wrong keyboard.