Toronto SEO
Web Design

What is responsive design and is my site responsive?

Updated April 19, 2026
Quick Answer

Responsive design means a single site adapts its layout to any screen size — phone, tablet, desktop. It's been mandatory for SEO since Google moved to mobile-first indexing. If your site has a separate m.yoursite.com mobile version, requires horizontal scrolling on phones, or has tap targets too close together, it's not properly responsive and is losing rankings.

How to test if your site is responsive

Open your site on a phone. Can you read text without zooming, tap buttons without missing, fill out forms without frustration? If no on any of these, your site fails the basic mobile test.

Use Chrome DevTools' device toolbar to test at 375px (iPhone SE), 414px (iPhone Pro Max), and 768px (iPad). Layout should reflow gracefully at each.

Run Search Console's Mobile Usability report and Google's Mobile-Friendly Test (search.google.com/test/mobile-friendly).

The responsive design fundamentals

Fluid grids using CSS flexbox or grid that resize proportionally. Avoid fixed-pixel widths on layout containers.

Flexible images that scale within their containers (max-width: 100%; height: auto).

Media queries that adjust layout, font sizes, and component visibility at standard breakpoints (640px, 768px, 1024px, 1280px).

Touch-friendly tap targets — minimum 48×48 pixels with at least 8px of spacing between adjacent buttons.

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