What is Screen Resolution?
Imagine your computer screen is a giant mosaic made of millions of tiny square lights. Each light is called a Pixel. The "Resolution" is simply the count of those lights. If your resolution is 1920x1080, it means you have 1,920 lights across and 1,080 lights down. The more pixels you have, the clearer and sharper your videos and games will look. AirOI Checker helps you identify your exact count so you can set up your wallpaper or games perfectly.
What is a Dead Pixel?
Sometimes, one of those tiny lights gets "stuck" or dies. It might stay black or a bright red color all the time. This is called a Dead Pixel. You can use our fullscreen test to change your screen color to solid Red, Green, or Blue. If you see a tiny dot that doesn't match the color, you've found a faulty pixel!
Logical vs. Physical Pixels
On modern phones and "Retina" MacBooks, the screen is so sharp that the browser uses a trick. It might show you a Logical Resolution (like 400 pixels wide) so the text isn't too tiny to read, but it actually uses Physical Pixels (like 1200 pixels) to make everything look super smooth. This is called the Device Pixel Ratio (DPR). Our tool shows you both numbers so you know exactly how powerful your screen is.
Frequently Asked Questions
What is the best resolution for gaming?
Most gamers use 1920x1080 (1080p) or 2560x1440 (2K). If you have a very powerful PC, you might even use 4K. The higher the resolution, the more work your graphics card has to do.
Can I fix a dead pixel online?
Real "dead" pixels (black dots) are usually permanent hardware damage. However, "stuck" pixels (colored dots) can sometimes be fixed by rapidly changing colors on the screen, which our test helps you do.
Does screen resolution affect battery life?
Yes! A higher resolution means your screen and graphics chip have to work harder. Turning down your resolution can help your laptop or phone battery last a little longer.