How to reduce image size with minimum available memory?

Question

linux

Server with a small amount of RAM.
Users sometimes upload obscenely large images, such as 8000x8000,
and the PHP handler crashes when trying to imagecreatefrompng()
Output requires 1280x720.
It would be nice to use some utility that requires a minimum of memory to reduce the size of too large pictures to about acceptable size. Before transferring to PHP and imagecreatefrompng()
Tell me, please, the easiest-fast utilities that can reduce the size of images in jpeg, gif, png, webp, say, exactly 2 or 4 times?

Answer 1

imagemagick CLI
www.ioncannon.net/linux/81/5-imagemagick-command-l...

Answer 2

1. There is libepeg only for JPEG.
2. Although, in conditions of low memory, it is possible to process images in a queue with a limited number of processors.
3. Or is it better to use third-party services?