Resize a picture by clicking "resize," choosing 'maintain aspect ratio,' changing either the percentage or the pixels, clicking "OK" and then save the picture. These instructions work for Windows computers that have the Microsoft Paint program.
Changing the resolution of a picture works to change its number of pixels to make it sharper or more blurry. Pixels help people to make a picture bigger without losing any of the visual quality. The file size increases as someone increases the pixels of a photo. The larger the file, the longer it takes to do things like attach to an email and send it.