Device Information
Review browser, operating-system estimate, screen, viewport, language, timezone and capability information without generating an identifier.
Open test →DIBrowser Information
Show practical browser and platform details alongside feature detection rather than relying on the browser name alone.
Open test →DIViewport Size Checker
Track the current layout viewport and compare it with the reported screen size and device pixel ratio.
Open test →DIScreen DPI Estimate
Explain browser pixel ratio and provide an estimate without claiming exact physical screen density.
Open test →DIQuick Device Check
Walk through browser, screen, keyboard, pointer, speaker, microphone and webcam checks, skipping any permission you do not want to grant.
Open test →What these browser tests can tell you
These tools show events, streams and capability values made available by your browser. They are useful for reproducing a problem and comparing behavior, but they do not certify a component or replace repair diagnostics.
Run a test more than once and, when practical, compare another current browser, port, cable or device. Each tool page gives a more specific interpretation and troubleshooting sequence.