About Screen Size Checker

Why this site exists

Responsive bug reports are usually useless because the reporter does not know their own viewport. "It looks broken on my laptop" starts a twenty-minute conversation that one number would have ended.

This site exists to be the link you send that person. It reports viewport, screen resolution, pixel ratio, and orientation on one screen, in language a non-developer can read back to you.

How the tool works

Every value is read from browser APIs on your device. Nothing is transmitted, so no device fingerprint is assembled from your visit.

Viewport size and screen resolution are shown separately and the difference is explained, because conflating them is the most common source of confusion in responsive debugging.

What accuracy means here

Reported values are exactly what your browser reports, including device pixel ratio, rather than a guess derived from a user-agent string. User-agent detection is unreliable and is not used for these numbers.

Who operates screensize.dev

screensize.dev is owned and operated by Noble Erne, LLC, an independent technology consultancy. Noble Erne builds and maintains a small group of single-purpose web utilities, each on its own domain, each written and reviewed separately.

The site is funded by advertising and, on a few pages, clearly labeled affiliate links. Nothing on the site is paid placement. No advertiser has any influence over what the guides say or what the tools report.

Who writes and reviews the content

Content on this site is written and reviewed in-house at Noble Erne, LLC. Enterprise systems consultant with a background in SAP implementation, software documentation, and instructional design. Builds the tools and writes the explainers on this site.

Every explainer on this site is written from scratch for this domain and reviewed before publication. Pages carry a review date so you can tell how current they are. When something turns out to be wrong, it gets corrected rather than quietly deleted.

Corrections and feedback

If something here is wrong, unclear, or out of date, the contact page reaches Noble Erne, LLC directly. Corrections from people who use the tool daily are the main reason these pages improve.