phatch (photo batch) does quick resize and once set up can save the preferred operation and sequence as a template.Then all you have to do is drag an drop any image into the hovered window and it is done.
Great to have hovering while reviewing shots in another viewer.
I use it on Ubuntu Linux though it is cross platform so should work with that other O/S too.
photobatch.stani.be
Oh, forgot to say that it is open source and free too !
Scroll right down to the bottom of the phatch page and use the links there in green
free download documentation translate support forum
as all the rest are offsite adds for other products. weird