Screen has black borders despite correct resolution

Your screen is set to its recommended resolution, but the desktop still does not reach the edges. Black borders can come from the monitor's scaling, a graphics setting, a TV's overscan controls, or a mismatch between the picture and the screen shape.

First check whether the borders are part of the display area or only appear in one app. The Screens tool shows each connected screen's reported resolution and scale, and lets you run a color test on a selected display.

Check where the black borders appear

Open Screens and find the display with the borders. Compare its reported resolution and scale with the display settings on your computer.
Run the color test on that display. Check whether the black margins remain around the test colors, rather than just around a video, game, or app window.
Look at the desktop, a different app, and the monitor's own menu. Note whether the border is on all four sides, only at the top and bottom, or only on one edge.
If you are using an external screen, connect it directly to the computer if possible. Temporarily remove a dock, adapter, or receiver from the connection.

A browser can report the active screen resolution and scale, but it cannot confirm the panel's exact physical dimensions or every setting in the monitor. Use the monitor's manual or on-screen information if you need to confirm its native resolution.

What the result means

The black border appears around everything

If the desktop and color test both stop short of the screen edges, the computer or display is likely scaling the image to fit inside the panel. Check the monitor's aspect ratio setting and the graphics scaling setting. A TV connected by HDMI may be treating the computer image as a video signal and adding underscan, which leaves a black margin.

The borders appear only in a video or game

The display may be working normally. The video or game could use a different aspect ratio, or its own window may not fill the screen. For example, a widescreen movie on a taller display can have black bars above and below it. Check the app's display or full-screen settings before changing the computer's resolution.

There are bars only on the left and right, or only above and below

This often means the image's shape does not match the screen's shape. Stretching it may remove the bars but make people and objects look too wide or too tall. A setting such as **1:1** or **Original** preserves the image's proportions, while **Full** or **Wide** may stretch it. Names and behavior vary by display.

The border stays in the same place with different devices

If the same part of the panel remains black when you connect another computer or device, the issue may be with the monitor or its active display area. A dark border that is part of the bezel is not a display fault, but a black area inside the image that persists across inputs may need service.

How to fix it

Confirm the display is using its recommended resolution. In Windows 11, open Settings › System › Display, select the affected screen, and check Display resolution. On a Mac, open System Settings › Displays and choose a default or recommended resolution. If you need help checking the native resolution, see how to check if your monitor is using native resolution.
Check the monitor's picture size setting. Open the monitor's physical menu and look for **Aspect Ratio**, **Picture Size**, **Scaling**, or a similarly named option. Try **Auto**, **1:1**, **Screen Fit**, or **Just Scan** if available. Avoid a stretch mode if it distorts the picture. On some TVs, **Overscan** should be off for a computer input, or a setting such as **Screen Fit** should be on.
Check graphics scaling on Windows. In Settings › System › Display, select the affected screen and verify the resolution. If it is correct but the border remains, open your graphics control app and look for a display scaling option such as **Fit to screen**, **Full panel**, or **Overscan**. These controls depend on the graphics hardware and driver. Change one setting at a time and check the result.
Check the Mac display options. Open System Settings › Displays and select the affected display. If the image is going to a TV, check for an **Overscan** option and adjust it if it is available. Not every Mac and display combination shows this control. If you use a scaled resolution, test the default resolution as well.
Try another cable or port. Disconnect and reconnect the cable at both ends. If you use a dock or adapter, connect the display directly to the computer, or try another compatible port. A different connection can help identify whether an adapter or cable is changing the signal mode.
Restart the computer and display. Turn the monitor or TV off, disconnect it from power briefly, then reconnect it and restart the computer. This can make the devices negotiate the display mode again after a connection or driver change.

When it may be a display fault

Test the screen with another computer or input source and show a full-screen solid color. If the same section stays black with several sources and cables, the problem is likely in the display rather than the computer's resolution setting. Check the warranty before attempting a repair. For a built-in laptop screen, arrange service if the dark area is inside the panel and does not change when you move windows or switch display modes.

Why correct resolution does not always fill the screen

Resolution describes the number of pixels in the signal. Scaling describes how the display fits those pixels onto its panel. A monitor can receive its native resolution but still shrink the picture if its scaling mode is set to **1:1**, or if a graphics setting applies underscan. A TV may also reserve a border to avoid cutting off the edges of broadcast video. That behavior is useful for some TV content but usually not for a computer desktop.

Change one setting at a time, then repeat the color test so you can tell which change affected the border.