MiniPortal Mod 1.12.2 adds mini version of the Nether Portal to Minecraft. Mini Portal is a device crafted from 4 obsidian blocks and 1 torch (which is really small, so you’ll never fit into it). But you can fit some items in it.
So you tired of this noisy sounds of nether portal in your house, but don’t want to break it because occasionally you’ll need like 4 netherracks for some mods, and then you have to load world, find some monsters and oh crap, you just died. Annoying as it is. But with this mod you will no longer need no use it, and plus you will save some resources as well as get rid of some common ones.