Right-click on the image and then select "Properties." A window will appear with the image's details. Go to the "Details" tab to see the image's dimensions and resolution.
How do I know the pixel size of an image?
- Right-click on the image (or, on a Mac, control-click).
- Choose Properties or Get Info.
- Click the Details tab. (or, on a Mac, More Info).
- You'll see the image dimensions in pixels.