What is my screen resolution? Free detector
Your resolution appears the moment this page loads. The detector shows the size your browser reports, your display scaling and an estimate of the native resolution, with the aspect ratio and a plain-English name such as 1440p or 4K.
How the resolution detector works
Your browser knows how large your screen is in a unit called CSS pixels and also how many physical pixels each of those covers. This page reads both values, multiplies them to estimate the real resolution of the panel, and compares the result with a list of common standards. It then reduces the width and height to an aspect ratio, such as 16:9 or 21:9, and shows how much of your screen the browser window uses.
Everything happens in your browser. No file or setting is sent anywhere, and the result updates when you resize the window, move to another monitor or change the zoom level.
Common screen resolutions
The usual names, sizes and pixel counts you will see when the detector reports your screen.
| Name | Resolution | Aspect ratio | Megapixels |
|---|---|---|---|
| 720p HD | 1280 x 720 | 16:9 | 0.92 |
| 1080p Full HD | 1920 x 1080 | 16:9 | 2.07 |
| 1440p QHD | 2560 x 1440 | 16:9 | 3.69 |
| Ultrawide 1440p | 3440 x 1440 | 21:9 | 4.95 |
| 4K UHD | 3840 x 2160 | 16:9 | 8.29 |
| 8K UHD | 7680 x 4320 | 16:9 | 33.18 |
Resolution, scaling and why numbers differ
Many people see a different figure in Windows than the one in a browser. The reason is display scaling. A 4K screen is 3840 by 2160 pixels, but at 150 percent scaling Windows lays out the desktop as if it were 2560 by 1440 so that text stays readable. The browser reports the scaled size and a pixel ratio of 1.5. This tool multiplies them back so the native estimate reads 3840 by 2160.
Browser zoom does the same thing. If the figure looks odd, press Control and zero to reset zoom and reload. On phones the ratio is often two or three, because the pixels are tiny and the system scales up to keep text readable.
Choosing a resolution and what to do next
Your native resolution sets how sharp the screen can look and how hard your graphics card must work. Higher resolutions need much more performance. Four times the pixels of 1080p is 4K, and the frame cost grows by well over two times. See what your card can drive with the FPS across resolutions calculator, check the matching size with the monitor PPI calculator, and see sharpness at your seat in the pixels per degree calculator.
If you run a screen below its native resolution, the image is stretched and looks soft, so match the system setting to the native figure unless you are using upscaling on purpose.
How to use the screen resolution detector
- Open this page on the screen you want to check.
- Read the detected resolution and the scaling.
- Compare the estimated native resolution with your monitor box or specifications.
- Reset browser zoom if the figures look wrong.
- Move the window to another monitor and check again.
Common mistakes to avoid
- Reading the scaled figure as the native resolution.
- Checking with browser zoom on, which changes the pixel ratio.
- Running a monitor below native resolution and wondering why text looks soft.
Related tools and guides
Keep going with these: Pixels per degree calculator, FPS at different resolutions calculator, monitor PPI calculator, aspect ratio calculator, DLSS render resolutions guide.
Frequently asked questions
How do I find my screen resolution?
Open this page and read the detected value. It shows the size your browser reports, the display scaling and an estimate of the native resolution. In Windows you can also check display settings, where the recommended resolution is the native one.
What is the difference between resolution and scaling?
Resolution is the number of physical pixels on the screen. Scaling enlarges text and windows so they stay readable on dense screens, so a 4K screen at 150 percent lays out like 1440p. The detector shows both and multiplies them to estimate native pixels.
Why does my browser show a smaller resolution than my monitor?
Display scaling is almost always the cause. Windows or macOS reports the scaled size to applications. The pixel ratio tells you the factor, and multiplying the reported size by it gives the native resolution that the monitor really has. Reset zoom first to be sure.
What resolution should I use for gaming?
Use the native resolution of your monitor, and pick the resolution your graphics card can drive at your target frame rate. Many players choose 1440p as a balance, with 4K for the strongest cards. Upscaling can help at higher resolutions.
Does the detector work on phones and tablets?
Yes. It reads the same values on any device. Phones usually have a pixel ratio of two or three, so the native figure is the reported size multiplied by that ratio. Rotate the device and the detector updates to show the new orientation.
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