Free Browser & Device Testing Tools
See your current viewport size and screen resolution, inspect what a site stores in localStorage, parse user-agent strings, and detect device capabilities. Useful when debugging responsive layouts and browser-specific bugs.
Screen Resolution & Viewport Tester
Inspect real-time browser window dimensions, screen resolution, device pixel ratio, and orientation.
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Local Storage & Session Storage Inspector
Inspect and view key-value pairs stored in your browser for the current domain.
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Browser User-Agent & Hardware Capabilities Detector
Detect browser engine, operating system, touch screen capability, and hardware concurrency.
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Same-Origin Cookie Viewer & Parser
Inspect document.cookie keys and values set for the current website domain.
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