What is my screen resolution?
Your resolution, window size, pixel ratio, colour depth and refresh rate.
- Screen
- 0 × 0 CSS pixels
- Physical pixels
- 0 × 0 device pixels
- Browser window
- 0 × 0
- Available area
- 0 × 0
- Pixel ratio
- 1×
- Colour depth
- 24-bit
- Refresh rate
- …
- Orientation
- Touch screen
- No
Browsers report sizes in CSS pixels; on a high-density screen, each of those covers several real pixels (that’s the pixel ratio). The refresh rate is measured over half a second, so it’s approximate.
Simple question, two answers. Your screen has a physical resolution, and your browser works in CSS pixels, which on a modern display cover several physical ones. Both are shown here, with the ratio between them.
The window size is the useful one for web work: it’s what your layout actually has to fit, and it’s always smaller than the screen.
Refresh rate is measured live over half a second, so a 120 Hz display shows as roughly 120 rather than the 60 most tools assume.
How to use it
- Open the page — the numbers are already there.
- Resize the window to watch the viewport figures change.
- Copy everything with one button if you need to report it.
Frequently asked questions
Why doesn’t this match the resolution in my system settings?
Because of scaling. At 200% scaling a 3840 × 2160 screen reports 1920 × 1080 CSS pixels with a pixel ratio of 2 — the "physical pixels" line multiplies them back out.
What is the pixel ratio?
How many device pixels make up one CSS pixel. 1 is a standard display, 2 or 3 is a high-density one, and it’s why images need to be exported at twice the size to look sharp.
Is the refresh rate exact?
It’s measured by counting frames over half a second, so expect something close to the real value rather than the exact one. Browsers also cap animation to 60 Hz in some power-saving modes.
Does this tell you anything about me?
It reads what your browser already exposes to every site, and shows it to you. Nothing is sent or stored.
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