I posted this on another thread
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Image Resizer for Windows - Download: Image Resizer 2.1 
 I just installed this resizer and I like it so far.  Once you install it all you have to do is find the pic in your PC, right click and choose resize.  It gives you 3 options (small, med, large).  It saves the file in the same directory and adds either small med or large to the file name.  The best thing is that it will do multiple pics at once.  I put it on a Windows 7 64 bit system.  Not sure if it will work on a newer OS.  Here is a sample of a file converted to large.  It took less than 5 seconds to convert 
 But it would still be easier if it were done automatically by YT.