Are there tools to quickly edit the shape of a photo?

Question

Design

There are many photographs that are vertically rectangular. Let's say 600 by 1000. The background is white.

The task is to quickly enough, with the help of the program, you can make it square. without stretching the photo itself. That is, the width should be equal to the height.

What programs are there for this, except for Photoshop (since it is difficult and long to work with thousands of photos in it)?

Answer 1

since it is difficult and time consuming to work with thousands of photos in it

2 minutes to write an action and for each photo somewhere else for 2-3 seconds, where is the difficulty?
I don’t see any problems writing a script in the same puff + gd/image, or in Python, but why does a designer need it?

Answer 2

XnView MP also allows batch processing of files.
Canvas Resizing -> Square Long/Short Side