If you've ever set a picture as the lock screen or desktop, you might find yourself dissatisfied using the crop that Windows 10 decided to use. Fortunately, you can custom-crop images to suit your display.

And you may get it done with just the software that came with your computer. All that you should do is open the image you need to use within Windows 10's Photos app, which knows the dimensions of your display, so you don't have to look them up.

Here's how you can edit photos to fit your display in Windows 10:

1. Open your image in Photos and hover over the top of the window together with your cursor.

2. Click Edit.

3. Select Lock Screen.

4. Adjust the crop box by dragging it and moving the corner dots to decide on the portion you want to use and click Apply.

5. Click Save a copy.

6. Click on the ... button.

7. Select Set as.

8. Select Set as lock screen or Set as background. Repeat steps 8, 9 and 10 as necessary.

You've cropped your image to suit your display!