Responsive Design

by SBS · Developer Tools

Manifest V3 Free

View in Chrome Web Store Data as of 16 Oct 2026

Preview any website on 40+ devices. Compare responsive layouts with real device resolutions. Free for developers.

Users

+13 in 30 days

Rating

0.0 / 5

unchanged in 30 days

Ratings

0 in 30 days

Store rank

#106K

#88K among extensions

Version

1.0.1

updated 20 Apr 2026

Users

monthly, 6 months

Latest, 16 Oct 2026: 54 usersMove the mouse over the chart for any month

Ratings count

monthly, 6 months

Latest, 16 Oct 2026: 0 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About Responsive Design

Responsive Design Checker lets you preview any website on 40+ real device resolutions instantly — right from your browser. FEATURES: • 52 real devices: iPhone 15, 15 Pro Max, SE, Galaxy S24, Pixel 8, iPad, Surface Pro, MacBook, Desktop 4K, and many more • Multi-preview: view your site on phone, tablet, and desktop side by side • Custom resolution: enter any width × height to test specific breakpoints • Device frames: toggle realistic device bezels for presentations and screenshots • Rotate: switch between portrait and landscape with one click • Screenshot: capture the current preview as PNG • Zoom controls: fit to screen, 1:1, zoom in/out • Keyboard shortcuts: R (rotate), S (screenshot), F (fit), +/- (zoom) • Dark interface designed for comfortable, distraction-free testing HOW IT WORKS: 1. Click the extension icon or enter any URL 2. Pick a device from the list (organized by category: iPhone, Android, Tablet, Desktop) 3. Your site loads in a real-size iframe — test responsive behavior instantly PERFECT FOR: • Web developers checking responsive breakpoints • UI/UX designers reviewing layouts across devices • QA testers verifying cross-device rendering • Freelancers presenting designs to clients 100% FREE — all features unlocked, no account required, no data collected. Privacy: Responsive Design Checker does not collect, store, or transmit any personal data. All previews run locally in your browser. No analytics, no tracking, no cookies.