Your Monitor Technical Information
The fact sheet gathers, on one screen, the information exposed by the browser about your display: logical and estimated resolution, devicePixelRatio, colour depth, declared gamut, dynamic range, orientation and the GPU compositing your frames.
Open tool fullscreen →Interface and local controls remain in Portuguese.
How to use
- Open the tool on the screen you want to audit — on dual-monitor setups, drag the window to the right panel before reading the values.
- Compare the estimate with the operating system display settings. Zoom, scaling and privacy protections can change these values; this reading does not confirm native panel resolution.
- Check the gamut and dynamic-range hints declared to the browser, then compare them with operating-system and monitor settings.
When to use
- Find out whether Windows or macOS is applying scaling (125%, 150%, 200%) and softening perceived sharpness.
- Observe whether the browser declares wider dynamic-range support before checking the mode in system settings.
- Record the GPU identifier exposed through WebGL, which may be generic or masked.
- Document a dated browser reading in reports, support tickets and IT inventories with its limitations.
Limitations
The browser only exposes what the operating system declares. It does not read the full EDID, does not measure luminance in cd/m² and cannot confirm real gamut coverage — that requires a colorimeter.
Frequently Asked Questions
- Why is the reported resolution lower than my 4K monitor?
- screen.width returns CSS pixels. Multiplying it by devicePixelRatio is only an estimate affected by page zoom and scaling; check operating system settings to confirm signal resolution.
- The GPU field shows "ANGLE", a generic name or nothing. Is that a problem?
- Not necessarily. Browsers may translate, abbreviate or hide renderer details for compatibility and privacy; confirm hardware in the operating system.
Technical Methodology & Display Science
The reading combines four independent sources. The Screen interface returns width, height, available area, colour depth and orientation in logical pixels. The devicePixelRatio property tells how many physical pixels exist per CSS pixel, and the product is an estimate, because devicePixelRatio also changes with page zoom.
Gamut and dynamic range come from the CSS `color-gamut` and `dynamic-range` media queries. They describe capabilities declared to the browser without measuring coverage, luminance or validating the full HDR chain.
GPU identification attempts to query `WEBGL_debug_renderer_info` in a temporary WebGL context. Browsers may omit or mask the value; the tool cannot confirm which GPU physically drives the panel.