Responsive web design uses a single flexible layout that adapts fluidly to any screen size.
Instead of creating separate designs for desktop, tablet, and mobile, responsive design relies on CSS media queries, flexible grids, and scalable images to automatically adjust your content based on the viewer's device.
A responsive design adjusts the design layout in real-time. Your fluid grid expands and contracts as the viewport changes.
Images scale proportionally using max-width: 100% so they never break your layout. CSS media queries detect screen width and apply different styles at specific breakpoints.
Most developers use a mobile-first responsive design approach, writing base styles for small screens and adding complexity as viewports grow.
The core advantage of responsive design is that the responsive design uses a single codebase to reach everyone.
Use responsive design when you need broad device compatibility without managing multiple templates.
Content-focused sites like blogs, news publications, and documentation benefit most because responsive layouts prioritize readability across all screen sizes.
Responsive design offers faster development and easier maintenance. You're updating one set of files instead of juggling separate mobile design and desktop design versions.
If your priority is SEO and you want search engines to easily crawl and index your content, you should use responsive web design.
One URL, one HTML structure, consistent content across devices—that's what Google prefers for a responsive website.