Select the images you want to “batch resize”

Open them in “Preview”
Press CMD+A to select all the images
Now from the “Tools” menu choose “Adjust Size…” and change the image dimensions as you prefer (often you will have just to modify the width).
Than remember to “Save All” the images from the menu “File” and you are done!
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Thanks for the tip. I Had no idea how to do it like that with preview. Do you know a simple way to do it with a PC? I have to used PS or Irfanviewer currently but its more complex than some of my friends can figure out. Let me know if you have any ideas.. :-) I told em to buy macs.
Great post! This all is so true.,
thank you for the post keep going on.
Very good article, I was so lucky.
Great article, you write this very well.
Thanks! I’d some many times scale images one by one and didn’t think about some way to make this more simple.
You saved my life ;)
Wow! I was never aware of this trick! Definitely a time saver!