1. Use MS Paint to Resize an Image
After opening or creating an image in MS Paint, you can resize it. To do this, place your mouse over Image on the toolbar and click Stretch/Skew. You can type in any number from 0-500 in the Horizontal and/or Vertical box and it will re-size your image by that much percent. For example, if you type in 70, you'll resize the image, or make it narrower, by 70%. This function is great if you need to re-size a large photograph. You can also re-size images by selecting the photo by going to Edit → Select All, and then finding and clicking on the corner blue squares and dragging the photo.