[pablomalo]

I've been using Shaarli, https://github.com/shaarli/Shaarli, for several years. It's proved very useful.

I like OP's idea of automated PDF save.

For Android users, one strong point of Shaarli is that there's a companion app, https://github.com/dimtion/Shaarlier, that allows you to save notes/links through the Android share menu.