Do you use the Windows OS?

The PowerTools ImageResizer has been recreated for current WinOS versions:

https://www.bricelam.net/ImageResizer/

I use Light Image Resizer It does much more than just resize pics. I use it mostly to resize and add watermarks to the pics I post. Works on Windows only.
You can use it for free if you don't mind the nag. IIRC the free version is limited to a certain number of files at a time and the count down increases with uses.
I got the paid version. ($20USD) You get unlimited upgrades.

On my mac I use Sips. Comes with it.

Colio! I didn't know. Off to play.

Quote from: chornbe on January 30, 2019, 08:03:17 AM

On my mac I use Sips. Comes with it.

Colio! I didn't know. Off to play.

sips --resampleWidth [new pixel width] [filename]
or
sips --resampleHeight [new pixel height] [filename]

Using either of these maintains the pic's aspect ratio. setting both, you can morph it, but you know... stuff gets wonky.

You can also crop, crop-and-resize, etc. Most of what you can do with ImageMagick (maybe all...?) can be done with sips. I think it can do basic type conversion, too. I use it all the time for creating the _1x, _2x, and _3x image files used in XCode for retina and iPad displays.