We have a LOT of photo resizing tools here on the site but this one has a lot of features and is actively developed.
https://www.4dots-software.com/photo-resizer-expert/
https://www.softpedia.com/get/Multimedi ... pert.shtml
License: Free for personal use, 15 days trialware for commercial
Status: Untested, but 4dots software has been tested before and was portable, so there's a good chance this one will be as well.
Photo Resizer Expert (4dots)
Re: Photo Resizer Expert (4dots)
I think a lot of their software isn't portable, so 50/50 at best. They do have some great utilities.