External display looks stretched: fix resolution and scaling

Your external display looks too wide or too tall, people appear unusually thin, or the desktop has black bars around it. The cause is often a resolution or aspect ratio setting, but scaling can also make text and icons look much too large or small.

First check what your computer reports for each connected display. The Screens tool shows each screen's resolution and scale, so you can compare the external display with your laptop screen before changing settings.

Check the external display

Open the Screens tool and find the entry for your external display. Compare its resolution and scale with the built-in screen, if your computer has one.
Use your operating system's display settings to identify which screen is the external one. On Windows 11, open Settings › System › Display and select Identify. On macOS, open System Settings › Displays and select the display you want to check.
Look at what seems wrong. If everything, including icons and windows, has the wrong proportions, check the resolution and the monitor's aspect ratio setting. If shapes look normal but text and icons are too large or small, check scaling.
Note the current resolution and scale before you change anything. If the picture looks stretched only in one app or video, check that app's zoom or aspect ratio setting too.

The Screens tool reports the resolution and scale the browser can see. It does not tell you the monitor's ideal resolution, so compare the reported value with the display's manual or product specifications if you are unsure.

What the result means

The resolution is lower than the display's native resolution

The native resolution is the number of pixels the panel is designed to show. A monitor with a native resolution of 1920 x 1080, for example, has a 16:9 shape. A lower resolution may look soft or blurry because the monitor has to scale the image to fit. A different-shaped resolution can also make the whole desktop look stretched.

Choose the display's native resolution, or the operating system's recommended resolution, in display settings. If that option is missing, check the cable, adapter, dock and graphics driver.

The resolution looks right, but text and icons are too large or small

This is usually a scaling issue, not a stretched picture. Scaling changes the size of interface elements while preserving their shape. Set the scale to the recommended value first, then adjust it if you want larger text or more room on the desktop.

Only the external screen looks stretched

The external display may have a different native resolution or aspect ratio from your laptop. Each screen can use its own resolution and scale. Make sure you selected the external display in settings before changing those values.

The desktop is normal, but a video or app looks stretched

The display settings are probably not the cause. Look for an aspect ratio, zoom, or fit option inside the video player or app. Some older apps may not adapt well to high display scaling.

How to fix it

Select the correct display. On Windows 11, open Settings › System › Display, select Identify, then click the rectangle for the external screen. On macOS, open System Settings › Displays and select the external display. Change settings only after the right screen is selected.
Use an extended desktop instead of mirroring. On Windows 11, go to Settings › System › Display › Multiple displays and choose Extend these displays. On macOS, open System Settings › Displays and set the external display to Extended display under Use as. Mirroring can make the computer use a resolution that both screens support, which may not fit the external monitor well.
Set the recommended resolution. In Windows 11, go to Settings › System › Display, select the external screen, and choose the option marked Recommended under Display resolution. On macOS, open System Settings › Displays, select the external screen, then choose Default or the resolution that matches the monitor's specifications. The screen may briefly go black while the setting changes.
Adjust scaling separately. On Windows 11, use Settings › System › Display › Scale and start with the recommended value. On macOS, open System Settings › Displays and select a resolution option that makes text comfortable to read. Scaling can change the apparent size of windows, but it should not make circles look oval or people look wider.
Check the monitor's own picture setting. Open the monitor's on-screen menu using its physical buttons. Look for an aspect ratio or picture size option such as Aspect, Original, or Auto. Names differ by model. Choose a mode that preserves the picture's proportions, rather than a mode that stretches it to fill the panel.
Reconnect the display if the right resolution is unavailable. Unplug and reconnect the cable, then try a different port or connect the monitor directly instead of through a dock. Check that the cable and adapter support the monitor's resolution. If the option is still missing, install the latest graphics driver from your computer maker or graphics hardware maker.

When the monitor or connection may be the problem

If the recommended resolution is missing, the computer may not be receiving the monitor's full display information. A low-quality adapter, an older cable, a dock, or a damaged port can limit the available modes. Try the monitor with another computer, or try your computer with another display, to narrow down which part is responsible.

If the picture remains distorted at the monitor's native resolution and with an aspect-preserving picture mode, check the monitor's manual and reset its picture settings. If the same problem appears with multiple computers and cables, contact the manufacturer or a repair shop. A fault in the display panel or its electronics may need repair or replacement.

Why scaling usually does not stretch a picture

Resolution and scale do different jobs. Resolution controls how many pixels the screen uses. Scale controls how large interface elements appear. A 150% scale makes items larger than 100% scaling, but it should keep their proportions. If a square becomes a rectangle, look at the resolution, the monitor's aspect ratio setting, or the app's own display controls instead.