Responsive Layout Tester

• Free online responsive layout testing tool
• Detects in real time the browser viewport size, breakpoint info, device pixel ratio, screen orientation, and more, helping developers debug responsive web design

1. Open the tool page — no installation needed
2. No input required: just resize your browser window and the tool instantly shows the current viewport size, breakpoint, screen orientation, and device pixel ratio
3. Read the live results; you can also click a breakpoint preset card to compare, or enter a URL in the preview pane to test a page's responsive layout

• This tool is completely free and requires no sign-up
• Everything runs locally in your browser — your data never leaves your device

Free online responsive layout testing tool. Real-time detection of browser viewport size, breakpoint info, device pixel ratio, screen orientation, and more. Helps developers debug responsive web design.

Open the tool page — no installation needed No input required: just resize your browser window and the tool instantly shows the current viewport size, breakpoint, screen orientation, and device pixel ratio Read the live results; you can also click a breakpoint preset card to compare, or enter a URL in the preview pane to test a page's responsive layout

This tool is completely free and requires no sign-up Everything runs locally in your browser — your data never leaves your device

Yes, Responsive Layout Tester is completely free. No download or installation required — it runs right in your browser.