What is the program for mass image optimization without quality loss?

Question

Image processing

Hello, I have a specific problem. There are approximately 200,000 (26 gigabytes) pictures of different formats (png, gif, jpg) and in different folders, everything needs to be optimized for the web. Actually, a 2-day search did not give a result - I tried xnview, but it overtakes all images in one format, fileoptimizer does not support saving the folder structure. What are the options?
Criteria:
- preservation of the folder structure;
- does not change the image format;
- does not spoil the quality;
- satisfies the requirement of google pagespeed insights;
- does not change file names;
- does not delete sources.

Answer 1

Image Catalyst - png, jpg, gif, batch processing.

Answer 2

I don’t know about gif, but png and jpg can optimize tinyPNG . True, the script for batch optimization will have to be written by yourself.

Answer 3

Read here: https://habrahabr.ru/post/168251/

Answer 4

pngout, optipng. But the output will always be png. And they are console. You need to run the script so that all files are processed.
I like.