How do I install Unslab?

Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. Download the .jar. Put it in the .minecraft/mods folder and launch that loader profile. Opens on Modrinth — not every file is mirrored on our own servers.

What Minecraft version does Unslab work with?

The listing gives Minecraft 1.21.4, 1.21.5. This is the version stated by the author or source site, not something we verified ourselves.

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Unslab

by Dooji · on Modrinth

Which Minecraft do you have?

Every version of the game needs its own build. Pick yours, then download — the wrong build installs fine and then does nothing in the game. This mod is built for Fabric only.

Minecraft 1.21.4–1.21.5Newest
Minecraft 1.21.2–1.21.3
Minecraft 1.21–1.21.1
Minecraft 1.20.1

⬇ Download for 1.21.4–1.21.5 ⬇ Download for 1.21.2–1.21.3 ⬇ Download for 1.21–1.21.1 ⬇ Download for 1.20.1

I don't know my version or loader

Open the Minecraft launcher and look at the profile you play on — it names both, like fabric-loader-1.21.4. The version also shows in the bottom-right corner of the game's main menu.

No loader in the profile name? Then it's plain Minecraft, and these mods won't run — you need Fabric or NeoForge installed first.

Open in MC Java Mods Get it on Google Play →

Unslab works with other mods!

Transform modded and vanilla slabs back into full blocks with ease!

If a slab is mapped to the wrong block, please report it on GitHub Issues.

Fabric

Requires Fabric API and Omnilib. Also compatible with Forge and NeoForge, using Sinytra Connector, requires Forgified Fabric API.

This mod provides a GUI interface where you can customize mappings - which for now doesn't work on servers. Therefore, for servers, Unslab is not required on the client.

Official Downloads:

CurseForge: https://www.curseforge.com/minecraft/mc-mods/unslab
GitHub: https://github.com/dooji2/unslab
Modrinth: https://modrinth.com/mod/unslab

Quick facts

Edition: Minecraft Java
File type: .jar
Minecraft versions listed: 1.21.4, 1.21.5
How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.

Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.

Verified by MCModsHub

Ships as unslab-1.21.4-v0.1.2.jar — drop this file into the mods folder
Download size: 84 KB
Download link checked 31 Aug 2026 — working

These come from our own check of the pack file, not from the source page.

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