Screen Resolution & Viewport Tester
Live window dimensions and aspect ratio.
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About Screen Resolution & Viewport Tester
Display live window, screen, and viewport dimensions plus common breakpoint status.
🔒 This tool runs entirely in your browser. Nothing is uploaded or stored.
Frequently Asked Questions about Screen Resolution & Viewport Tester
How do I use the Screen Resolution & Viewport Tester?
Open the Screen Resolution & Viewport Tester and use the controls in the workspace below: live window dimensions and aspect ratio. Results appear instantly in your browser, with nothing to install, sign up for, or pay for.
Is the Screen Resolution & Viewport Tester free?
Yes. The Screen Resolution & Viewport Tester is completely free, like every tool in the PrimeFreeTools library. There are no accounts, subscriptions, or usage limits.
Does the Screen Resolution & Viewport Tester store or share my data?
No. The Screen Resolution & Viewport Tester runs with JavaScript in your browser, so what you enter never leaves your device and nothing is stored on a server.
What can I use the Screen Resolution & Viewport Tester for?
Display live window, screen, and viewport dimensions plus common breakpoint status. You will find it grouped under Developer Tools together with 75 other free tools on the PrimeFreeTools homepage.