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Simple Block Replacer

A simple mod to replace blocks with other blocks.

NeoForge
Loaders
NeoForge
Downloads on Modrinth
801
Followers on Modrinth
3
versions
3
Updated
April 1, 2026Apr 1
Published
in 2026

At a glance

Runs on NeoForge
For Minecraft 1.21.1
Server only — players don't need to install it
Latest version — 1.0.4-1.21.1 from April 1, 2026
Requires LanternLib
License MIT — free
Where it's needed
In gamenot neededOn serverrequired

Install on the server only; players don't need it

Game versions1.21.1

Block Replacer is a mod that lets you replace blocks in the world (upon chunk generation) with another block. The main intention of this mod is block deduplication. Imagine you have Biomes O' Plenty and Regions Unexplored at the same time. Well, you'd have 2 different sets of multiple wood types which is inconvenient, with this mod, you can only keep one set by replacing the other.

All info on how to replace a block is located in the blockreplacer.json5 config.

NOTE: This mod has no retroactive capibilities, it will only replace newly placed/generated blocks since it's install.

Performance

I tested a config that replaces all stone blocks in the world with blocks of diamond and the performance hit was negligable. This is partially due to the fact that the mod intercepts the methods that sets the blocks during chunk generation and do the replacement directly there so it's almost as if nothing changed.

Modpack Usage

Feel free to include this mod in your own packs. Just don’t expect full support since I don’t mod Minecraft regularly.

Is this not just Block Swap?

Not quite. This mod is significantly simpler in implementation as all it does is replace blocks. It doesn't have a state swapper, or an ID remapper. Currently, Block Swap is getting a revamp for 1.21.1 but since the Author is busy and the scope of the mod has increased, it will be quite a while before that happens. I would like to state that this is not a port of blockswap nor is it a good alterative for it. I only made this mod because I needed a block replacer.

FAQ

How to install Simple Block Replacer?

Install NeoForge for your Minecraft version, download Simple Block Replacer for the same version and loader, put the file into the mods folder and launch the game with the loader profile.

Which Minecraft versions does Simple Block Replacer support?

Simple Block Replacer has builds for Minecraft 1.21.1.

Is Simple Block Replacer needed on the server?

Server only — players don't need to install it

License and source
MIT Licensefree to use and share with credit to the author
Original — Modrinth↗Files unchanged, verified with SHA-512Is this your mod? For rights holders

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