XnView Software

I have several multi-page TIFs (b&w documents), which I would like to compress using the Group 4 compression. However, Xnview seems to compress only the first page of the document, while the other pages are "ignored".

Is there any easier way to compress a multi-page file, than splitting the document into singular pages, converting all the pages and then joining them back together?

Thanks for your help in advance,
Gasper