Resize photos for upload step by step (all version of windows):
1: Download Image resizer program.
If you don't now about 32 or 64 bit windows version, please select download link from line (A).
A: Download (ImageResizer-2.1_x86.msi) for windows 32bit.
B: Download (ImageResizer-2.1_x64.msi) for windows 64bit.
2: Install program on your computer.
After download, run and install (msi) setup file.
3: Select photos you want to resize, Define option and done!
After Image Resizer Program is installed, one option would be added in your mouse's right click. you can select your images then right click and select Resize Pictures option from menu, in new window select (medium) size and press Ok!