ScreenSize.net

Free screen size, viewport & DPR checker for devs

by Murl Daniel

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Oct 25, 2026 Developer Tools

breakpoint references dev toolkit pixel ratio screen resolution viewport checker

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ScreenSize.net is a free toolkit for front-end developers, designers and QA engineers who need exact display numbers fast. It detects your screen resolution, viewport size and device pixel ratio live in the browser, and adds PPI and aspect-ratio calculators, Tailwind/Bootstrap breakpoint references and spec charts for popular phones, tablets and laptops. Everything runs client-side with no sign-up.