Changing multiple file endings

Hello guys,

I am currently re-organizing my picture library.

I have 15 000 images organized in folders from each year; 2002, 2003, etc. My problem is that all of the images have different file endings. Every picture is .jpeg picture, but some of the images have the file ending in caps and others have small letters.

So basically I want to change the file ending for all my images. I want every image to have the ending in caps as in here: ".JPEG".

I was wondering if anyone have any tips on how I can do this on multiple items at once? I don't want to sit and do this on every picture..

Thanks in advance guys

 

Awesome guys. I found a program called "A Better Finder Rename". It did the trick!