You connect your PC or console to a monitor over HDMI and the image does not fill the screen: there is a black border around every edge, or the picture spills off and cuts the taskbar. This is overscan, a leftover from old television standards, and it is usually fixable in a few minutes. Here is what causes it and how to make the picture fit perfectly.
Why Overscan Happens
Decades ago, TVs deliberately cut off the outer edges of a broadcast because early sets could not display them cleanly. Some displays and graphics drivers still apply that behavior over HDMI, shrinking or cropping the image. Monitors are more prone to it when the source treats them like a TV, which HDMI connections sometimes trigger. The result is either black bars from the image being scaled down, or a cropped picture from it being scaled up.
Overscan Symptoms and Causes
| Symptom | Likely cause |
|---|---|
| Black border on all sides | Image underscanned to fit an old TV area |
| Edges cut off, taskbar hidden | Image overscanned past the panel |
| Only over HDMI, fine on DisplayPort | HDMI treated as a TV signal |
Step-by-Step Fixes
1. Adjust Scaling in the GPU Control Panel
On an NVIDIA system, open the control panel, go to Adjust Desktop Size and Position, and set scaling to No Scaling or Full-Screen, then look for an Overscan or underscan slider and drag it until the image fits edge to edge. On an AMD system, open the software, find the display settings, and adjust the HDMI Scaling slider to zero. This is the most common cure.
2. Check the Monitor’s Own Menu
Many monitors have a picture setting called Aspect, Screen Fit, Just Scan, 1:1, or Pixel-for-Pixel. Set it to the option that maps each source pixel directly, often labeled Just Scan or 1:1, which disables the display’s own overscan.
3. Set the Right Resolution and Refresh
Make sure Windows or the console is outputting the monitor’s native resolution. A mismatched resolution can trigger scaling that looks like overscan. Select the resolution marked recommended or native.
4. Try a Different HDMI Input or Cable
Some monitors label one HDMI port as a PC input and handle scaling differently on it. Switching ports, or using DisplayPort or USB-C instead, often sidesteps overscan entirely because those connections are less likely to apply TV-style scaling.
Preventing Overscan From Coming Back
Once you have the picture filling the screen, a little housekeeping keeps overscan from returning after updates or hardware changes. Graphics driver updates occasionally reset scaling preferences, so if black bars reappear after a driver install, revisit the GPU control panel and set HDMI scaling back to zero. Making a note of which setting fixed it saves you rediscovering the cure months later.
It also helps to standardize on the connection that behaves best. If your monitor and graphics card both support DisplayPort or USB-C, using one of those instead of HDMI often eliminates overscan permanently, because those interfaces were designed for computers and do not carry the television-era scaling assumptions. Reserve HDMI for devices that require it, such as consoles, and configure each of those in the monitor’s own aspect menu using the Just Scan or 1:1 option. With the GPU scaling disabled, the display set to map pixels directly, and the native resolution selected, the image should stay edge to edge across reboots and stay pixel-sharp rather than softened by any hidden scaling.
Frequently Asked Questions
Why does overscan only happen over HDMI and not DisplayPort?
HDMI grew out of the television world, so drivers and displays sometimes assume an HDMI source is a TV signal that needs the old overscan treatment. DisplayPort was designed for computers and does not carry that legacy, which is why the same monitor often fills the screen correctly over DisplayPort with no adjustment.
Will fixing overscan hurt image quality?
No, quite the opposite. Disabling overscan usually gives you a sharper, pixel-accurate image because the display stops scaling the picture up or down. Mapping each source pixel to a panel pixel is exactly what you want for the crispest result.
Bottom Line
Black bars or cropped edges over HDMI are almost always overscan, caused by TV-era scaling. Set your GPU’s HDMI scaling to zero, switch the monitor’s aspect setting to Just Scan or 1:1, confirm native resolution, and if needed try DisplayPort. One of those steps will make the picture fit the screen perfectly.
