Simple Block Replacer

Simple Block Replacer

A simple mod to replace blocks with other blocks.

by
426 Downloads
neoforgemanagementutilityworldgen
Rent Server with this Mod

About this Mod

Due to a lack of time, I am no longer updating this mod

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

You may include this mod into your own modpacks as long as it is distributed through CurseForge, Modrinth, or any other recognized mainstream modding platforms that may exist in the future.

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.

Available Versions

Block Replacer v1.0.4 - mc1.21.1release
MC 1.21.1neoforge
April 1, 2026
Block Replacer - v1.0.3 - mc1.21.1release
MC 1.21.1neoforge
March 29, 2026
Block Replacer - v1.0.0 - mc1.21.1release
MC 1.21.1neoforge
January 27, 2026

How to Install Simple Block Replacer on Your Server

1

Order Server

Order a Minecraft Java server with at least 4 GB RAM (6 GB recommended).

2

Set neoforge Loader

In the panel under "Egg", select the neoforge loader and matching Minecraft version (1.21.1).

3

Install Mod

Open the mod browser in the dashboard and search for "Simple Block Replacer". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

neoforge

Minecraft Versions

1.21.1

Server-side

Required

Recommended RAM

6 GB(min. 4 GB)

Frequently Asked Questions

Simple Block Replacer server crashes on startup – what to do?

Most common cause: wrong neoforge version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 4 GB RAM is allocated and the loader matches the mod version (1.21.1). You can switch loaders with one click in the panel.

Is Simple Block Replacer compatible with neoforge?

Simple Block Replacer officially supports neoforge for Minecraft 1.21.1. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with Simple Block Replacer – how to optimize performance?

Recommended RAM: 6 GB (per 5 players). Use /spark profiler to check if Simple Block Replacer consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.

Rent Modded Server

Install Simple Block Replacer with just one click on your server.

Recommended RAM
6 GBab €12/mo
Min. 4 GB | +1 GB pro 5 Spieler
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NVMe SSD Storage
DDoS Protection included

Details

License
MIT License
Server-side
Required

Supported Versions

1.21.1