XnView Software

I am very satisfied with the xnview classic, but I miss a function with which can change the size of multiple pictures in % for several images at the same time. Does this function exist and I overlooked it or do I always have to use xnresize?

Otherwise can I somehow integrate it or is there a plugin?

From the browser or viewer Tools > Batch Processing... provides the function you need...

Ah thanks for the hint, i have now found it.