Just gave this a test run and I must say that I'm very impressed. You can also add watermakrs to your photo's or images.
From the Authors:
We created Bulk Resize Photos after going on a holiday with friends in 2014. When it was time to share photos of our holiday, the friend with the best camera had photos too large to share and no convenient way to make them smaller.
None of the images used with Bulk Resize Photos get uploaded. They are all processed on your computer. That makes Bulk Resize Photos both fast & convenient.