Check Your Resolution
Your display resolution is written as width × height in pixels. Common examples include 1366 × 768, 1920 × 1080 (Full HD) and 2560 × 1440 (QHD).
The box above updates in real time as you resize your browser, and the quick stats show your screen's device pixel ratio — useful to know if you have a high-DPI or "Retina" display.
Common Screen Resolutions
| Resolution | Common Name | Where It Is Often Used |
|---|---|---|
| 1280 × 720 | HD | Older laptops, budget displays |
| 1366 × 768 | — | Budget 13–15" laptops |
| 1920 × 1080 | Full HD / 1080p | Most common monitor & TV resolution |
| 2560 × 1440 | QHD / 2K | 27" monitors |
| 2560 × 1664 / 3024 × 1964 | — | Modern MacBooks (Retina) |
| 3440 × 1440 | Ultrawide | 21:9 gaming monitors |
| 3840 × 2160 | 4K / UHD | 27–32" monitors, 4K TVs |
CSS Pixels vs Physical Pixels
Modern displays have a device pixel ratio (DPR) of 1, 1.5, 2 or even 3. This means each CSS pixel that a website uses maps to several physical pixels on your screen.
- On a normal monitor the DPR is usually 1.
- On a Retina MacBook or a high-end phone the DPR is 2 (or more).
- Check your own ratio in the quick stats above.
That is why a 4K phone can still report a "CSS" resolution of only 1080 × 2400 for websites — the extra pixels are used for sharpness, not extra layout space.
Frequently Asked Questions
What is my screen resolution?
Look at the numbers this page reports in real time, or check Windows Settings → System → Display, or macOS About This Mac → Displays. The resolution is written as width × height in pixels.
Is 1920x1080 a good resolution?
Yes — Full HD (1920 × 1080) is still the most common and perfectly fine for work, video and casual gaming. QHD (2560 × 1440) and 4K (3840 × 2160) are sharper but need more GPU power.
Why does my phone report 390x844 even though it has a big screen?
Because browsers use CSS pixels. A phone like the iPhone 14 has 1170 physical pixels across, but reports roughly 390 CSS pixels for layout, with a device pixel ratio of 3.