InspectDev
Responsive Checker
A streamlined viewport tester that cycles through the most common device sizes. Preview how your layout holds up at each breakpoint, spot overflow issues, and see which media queries are active — all without resizing your browser.
About Responsive Checker
Responsive Checker cycles through mobile, tablet, laptop, and desktop viewports with one click. Overflow issues are highlighted automatically, and the media query monitor shows which rules are active at each size.
Features
Check your page at every common breakpoint in seconds.
Quick Presets
Cycle through mobile, tablet, laptop, and desktop presets with one click. Each preset uses real device viewport dimensions.
Overflow Detection
Elements that overflow or cause horizontal scroll are highlighted automatically as you resize. Catch layout breaks early.
Media Query Monitor
See which CSS media queries are active at the current viewport size. Know exactly which breakpoints your page is hitting.
How to use
- 1
Select Responsive Checker from the InspectDev toolbar.
- 2
Click through the device presets to preview each breakpoint.
- 3
Watch for overflow highlights — any element breaking the layout gets flagged.
- 4
Use the media query panel to see which rules apply at each size.
Try Responsive Checker free
Responsive Checker is included in the free version of InspectDev. Upgrade to Pro for advanced features like persistent workspaces and team sync.
