What Is My Screen Size?
What Is My Screen Size?

Free screen resolution checker and developer layout tools — private, in-browser.

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    What Is My Screen Size?
    What Is My Screen Size?
    WhatIsMyScreenSize

    Breakpoint inspector

    Responsive Breakpoint Checker — Tailwind CSS Breakpoints

    Enter any width in pixels to see which min-width tiers match, with a visual Tailwind ruler. Defaults: sm 640, md 768, lg 1024, xl 1280, 2xl 1536.

    Responsive breakpoint checker

    Viewport width

    Largest Tailwind breakpoint satisfied: base (min-width rules use the same pixel values as Tailwind v3 defaults.)

    Tailwind breakpoint ruler390px
    0sm640md768lg1024xl12802xl15361920

    min-width breakpoints

    NamepxMatches
    sm640no
    md768no
    lg1024no
    xl1280no
    2xl1536no

    Quick presets

    Generate CSS snippets in our media query generator, compare real device specs in our device database, or device compare.

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    How active Tailwind breakpoints are labeled

    We show the largest breakpoint your width satisfies. At 900px, for example, you are in the md range for min-width stacking. Always verify custom values in your config.

    Explore real hardware sizes in our device list or test live values on what is my viewport.

    Common viewport widths

    Quick references for popular device CSS widths. Generate matching @media snippets or validate full specs via device compare.

    • 320px → base
    • 360px → base
    • 375px → base
    • 390px → base
    • 393px → base
    • 402px → base
    • 414px → base
    • 428px → base
    • 430px → base
    • 768px → md
    What Is My Screen Size?
    What Is My Screen Size?
    WhatIsMyScreenSize
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