To resize pictures, I just open them with paint,(Right click on mouse)Click open with, Then click paint.
go to image at the top left of screen, Click on stretch-scew. Depending
on the size of your picture. You will have to play with this option, Its not hard to learn. You have to decreace the numbers in the boxes from 100 % to 50% or mabey less.
I keep a seperate file witch I copy pics to for downsizing,
After applying the % change, Click the x top right of screen
Then click on save changes.
I'm Not an expert for sure. Hope this helps.
Also if you go to my pics. Open a folder. Put your pointer you want to downsize, It should tell you the pic size, Dimenison and KB. Downsize the photo until you see the dimension of 145 x 145 or less. Jake