Screen & Viewport Tester — Free Online Tool

read window inner/outer sizes, screen pixel box, and devicePixelRatio for responsive debugging—no remote fingerprinting service.

Screen & Viewport Tester — Free Online Tool: Free Screen & Viewport Tester — innerWidth & DPR handles screen viewport tester in your browser. Free tool—read window inner/outer sizes, screen pixel box, and devicePixelRatio for responsive debugging—no remote fingerprinting service. developers and IT support use it when they want a free, no-signup workflow. How to use: Open the controls on this page and supply the required input. Apply the main action (convert, format, analyze, or export). Copy or download the result—see FAQs for limits and privacy. Frequently asked questions: Why innerWidth differs from device pixels? CSS pixels relate to dips; multiply by devicePixelRatio for rough physical approximation—still not PPI calibration. Does Free Screen & Viewport Tester — innerWidth & DPR send my pasted code to a server? JSON, text, hash, and decode utilities on Techtter run in your tab unless this page documents an external API call. Can Free Screen & Viewport Tester — innerWidth & DPR replace production monitoring? No—it is a quick desk check. Use your CI, observability stack, and official docs for authoritative validation.

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