Hi Omdahl,
The easiest way to get smaller images is to record them that way with the camera. To do this, turn the camera on and press the MENU button. Now scroll down to "Quality" and press the SET button.
On the next screen, you'll be able to select the size that best meets your needs. There's a more complete description of this, beginning on page 76 of your EOS Rebel T3i Manual.
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