Browser Tools

Viewport Size Checker

Measure live viewport width and height for responsive layout testing.

Batch ready

The Apex Toolz promise

Private · Free · Local

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Use instantly, no account

100% Free

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Browser-Based

100% local in your tab

How to use Viewport Size

1Resize your browser window.
2See live viewport width and height updates.
3Match common breakpoint widths for CSS.

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