Why your two monitors have different scaling

Text and windows look larger on one monitor, or everything seems too small on the other. This is usually caused by different scaling settings, different screen resolutions, or the displays having different pixel densities. It does not necessarily mean either monitor is faulty.

First check what your computer reports for each display. TooLab's Screens tool shows the resolution and scale of connected screens, which can help you tell whether the difference comes from a setting or from the displays themselves.

Check both monitors

1. Open Screens and look at the reported resolution and scale for each connected display.
2. Write down each monitor's resolution and scale. For example, one may show 1920 × 1080 at 100%, while the other shows 2560 × 1440 at 125%.
3. Move the same window between the monitors. Compare the text, buttons, and window size, not just the desktop wallpaper.
4. Open your computer's display settings and check the scale and resolution assigned to each monitor. Make sure you have selected the monitor you want to adjust.

The resolution is the number of pixels the display uses. Scale changes how large text and interface elements appear, using those pixels. A display can have a high resolution and still show large text if its scale is set above 100%.

What the result means

The scale values are different

Your computer is deliberately drawing interface elements at different sizes on the two displays. For example, a monitor set to 150% scale will usually show larger text and controls than one set to 100%. This is often intentional, especially if one screen is smaller or has a much higher resolution. Adjust each monitor's scale in display settings if the difference is uncomfortable.

The scale values match, but things still look different

The displays may have different pixel densities, which means one packs more pixels into the same physical area. A 27-inch 4K monitor and a 24-inch 1080p monitor can make text look different even at the same scale. Compare the physical size of text and controls, then adjust each display separately rather than expecting one percentage to look identical on both.

One monitor has a much lower resolution than expected

The display may be using a non-native resolution. A non-native resolution can make text look blurry or stretched, and can change the apparent size of interface elements. Select the recommended resolution for that display before changing its scale.

Only one program looks wrong

The operating system's scaling may be fine, while that program has its own zoom or display behavior. Check the program's zoom setting and compare it with another app. Some older desktop apps also look blurry or change size when moved between screens with different scale settings.

How to make the monitors look more alike

1. Set each monitor to its recommended resolution. In Windows 11, open Settings › System › Display, select a display, then check Display resolution. On macOS, open System Settings › Displays, select a display, and choose a resolution option that looks clear and comfortable.
2. Adjust the scale for each display. In Windows 11, go to Settings › System › Display, select the monitor, and choose a value under Scale. Try a nearby option, such as 100%, 125%, or 150%, and repeat for the other screen. On macOS, open System Settings › Displays, select a display, and choose a scaled option that makes text and controls comfortable to read.
3. Compare the same content on both screens. Move a settings window or document from one display to the other. Adjust scale in small steps until text and controls are a similar physical size. You do not have to use the same percentage on both monitors.
4. Check the cable and display connection. If a monitor is missing its recommended resolution or looks blurry, reconnect its cable and try another port. A dock or adapter can limit the available resolution, especially with high-resolution monitors.
5. Sign out or restart if an app stays blurry. Some apps do not adapt immediately after a scaling change. Close and reopen the app first. If the desktop or several apps still look wrong, restart the computer and check the settings again.
6. Check app zoom separately. In a web browser, use its zoom controls to return the page to its usual size. Browser zoom is separate from the operating system's display scale, so changing one does not reliably correct the other.

Why identical settings do not always look identical

Scale is a percentage, not a promise that objects will appear exactly the same size on every screen. The monitor's physical dimensions and pixel density matter too. A small, high-resolution laptop display often needs more scaling than a large external monitor so that menus and text remain readable.

Also, some programs are not designed to resize smoothly when you move them between monitors. If only one older program becomes blurry or too large, leave the monitor settings at comfortable values and check that program for an update or a compatibility option. Changing the display resolution to compensate can make everything else look worse.