Requires the library mod Collective.

This mod is part of The Vanilla Experience modpack and Serilum's RPG Bundle mod.
Smaller Nether Portals is a minimalistic mod which allows the creation of smaller nether portals, specifically the sizes 1x2, 1x3 and 2x2.

Note: There is currently a "bug" in Minecraft when teleporting from a smaller portal, which places the player underneath the portal on the other side. The mod can detect when this happens, and will teleport the player in front of the portal instead. It detects the blocks below, and if it's Netherrack, Soul Sand or an Air block, it will replace those blocks with obsidian to prevent unwanted deaths. It will also create an air gap if necessary.

The smaller portals:
all

If you wish to do so, you may omit the corners:
nocorners

Here the mod has detected the player underground after using the smaller portal, and instead placed the player in front of it:

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You may freely use this mod in any modpack, as long as the download remains hosted within the CurseForge ecosystem.

Serilum.com contains an overview and more information on all mods available.

Comments are disabled as I'm unable to keep track of all the separate pages on each mod.
For issues, ideas, suggestions or anything else there is the Github repo. Thanks!