For Batch Image Resizing on Mac, iMage Tools Free App is Recommended
For batch image resizing on MacOS, I recommend the free iMage Tools app.
iMage Tools is a free app, so it’s nice that you can try it out casually.
I use it to resize photos before uploading them in bulk to my personal blog.
Photos taken with iPhone 6s become about 2MB per photo, making the download size per article very large, so I try to resize them as much as possible before posting.
That’s all from the Gemba.