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Breakpoint Previewer

Monitor the viewport width live and highlight the active Tailwind breakpoint with pixel thresholds.

Viewport width

0px

Active breakpoint

xs< 640px

active

sm640–767px

md768–1023px

lg1024–1279px

xl1280–1535px

2xl≥ 1536px

Resize the browser window to see the active breakpoint update in real time. Thresholds match Tailwind CSS v4 defaults.

Loading tool…

How it works

The viewport width updates on resize

The active breakpoint row is highlighted

Resize the window to watch it flip

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