A practical pre-launch QA pass for 320 px, 375 px and 414 px screens.
A landing page can look polished on a laptop and still lose customers on a phone. The problem is rarely one dramatic failure. It is usually five small defects that make the first action harder than it should be.
1. Horizontal overflow that only appears at one width
Test at 320 px, 375 px and 414 px. Look for clipped copy, carousels wider than the viewport, fixed-width tables and decorative elements that push the page sideways. Record the exact viewport and attach a screenshot; “mobile is broken” is not an actionable bug report.
2. A primary CTA that disappears below the fold
The visitor should understand the offer and see the primary action without hunting. Check whether a tall hero image, consent banner or oversized navigation moves the CTA below the first useful screen. The fix is often hierarchy, not more copy.
3. Touch targets that work with a mouse but not a thumb
Buttons and links need enough space to tap reliably. Use 44 × 44 px as a practical minimum, then check the distance between adjacent controls. Tiny close icons, crowded navigation and text-only links are common failure points.
4. Forms that ignore the mobile keyboard
Verify labels, focus order, error messages, autofill and the keyboard type for email, phone and numeric fields. A form can technically submit and still create enough friction to lose the conversion.
5. Images that steal the performance budget
Inspect oversized hero images, off-screen media loaded too early and layout shifts caused by missing dimensions. The goal is not a perfect laboratory score; it is a stable first interaction on a real connection.
A useful QA report should make every finding reproducible: viewport, steps, expected behaviour, actual behaviour, screenshot and priority. That format gives a designer or developer something they can fix immediately.
I have packaged this process into a fixed-scope Mobile Landing Page QA Audit: one live page, annotated screenshots, a prioritized fix list and one retest, delivered within five business days for $59.
AI-assisted tools may support analysis; every published finding is reviewed before delivery.
Originally published by RELAUNCH DEPT. on Medium.
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