Viewport Size Monitor

Inspect browser window dimensions dynamically to verify responsive design queries.

Retrieving browser diagnostic information...

Processed locally in your browser — nothing is uploaded.

How to Use

A viewport is the visible area of a web page on a device screen. It varies with window resizing.

Screen Resolution Inspector

Diagnose device screen resolution and color depths.

Browser Info & Diagnostics

Get a complete report on your browser name, layout engine, and system properties.