Accessibility and Zoom Check
The screen looks wrong - huge text, white on white, missing colors, no animations? This tells you in one click whether an accessibility, contrast, or zoom setting the OS or the browser turned on is reaching the page, exactly what each active mode does, and the one keystroke or setting that changes it. It reads settings only; it never changes them.
Read the Accessibility and Zoom Check guide for help reading the verdict or fixing each active mode.
matchMedia and viewport metrics. No setting is changed, nothing is measured on a server, and nothing is transmitted. View source to verify.Configuration
Runs instantly and entirely in this browser tab. After the first run it keeps watching: toggle a Windows or macOS accessibility setting, or press Ctrl++ / Ctrl+-, and the readout updates live.
Diagnostic complete
Accessibility, contrast, and motion settings
Reads forced-colors (High Contrast), contrast, reduced motion, color scheme, and transparency preferences.
Page zoom and display scaling
Estimates browser zoom and pinch zoom, and reports device pixel ratio and root font size honestly.