ModsFinder

Replace Mod

by CoolGuyWithAPen

With Replace Mod, a player who wants a different block swaps the one already placed, using a replace mode toggled on the R key and the off hand.

NeoForgeClient and serverMIT LicenseOpen source1.21.1

What it does

The mod adds a replace mode for building. A player enables it with the R key, holds the block to place in the off hand, and uses it on a block that should change. Steps are short, so a whole stretch of beach sand, red sand, oak walls or spruce walls can be swapped without breaking each piece by hand.

Replace Mod is a NeoForge mod for 1.21.1 and runs on client and server, so the server and every player need it. It is released under the MIT License and is open source, with the source code and an issue tracker public. Its first and latest file is 1.0, dated 2026-03-23.

The mod is decoration-focused and also sits under game mechanics and utility, so it suits builders who revise finished areas. Players who want the same workflow with enchantments treated more strictly can look at a separate Replace Enchantment mod instead.

Key features

  1. Replace mode toggle

    Pressing R turns on a replace mode, so the next placement targets the block already in the world.

  2. Off-hand replacement

    The replacement block is held in the off hand, and the block to change is broken and substituted in one action.

  3. Bulk block swaps

    Whole runs of sand, walls or other blocks can be exchanged in a few steps rather than one at a time.

  4. Quick revisions

    Finished builds can be adjusted in place when a block does not fit the look, without rebuilding the area.

Compatibility

Latest build for each game version and loader.

1.21.11.0
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

How it compares

Full comparison

Auto Replace is a NeoForge mod for 1.21.1 under All rights reserved, not open source, and it can run on the client or the server. Vine Replacer is also for NeoForge 1.21.1, but it is server-side only and released under the MIT License, so only the server needs it, and it is not open source.

ModLoadersGame versionsEnvironmentUpdated
Replace ModNeoForge1.21.1Client and server2026-03-23
Auto ReplaceNeoForge1.21.1Client or server, optional2025-07-05
Vine ReplacerNeoForge1.21.1Server-side only2026-09-01

Questions

Does Replace Mod need to be installed on the server?

Yes. Servers that run it need every player to install it too.

Which loader and version does Replace Mod support?

Replace Mod is published for NeoForge only, for Minecraft 1.21.1 alone.

Which key turns on the replace mode?

Pressing R enables the replace mode, after which the block held in the off hand is used to replace the targeted block.

In the catalog

Replace Mod is one of 12,078 Decoration mods on ModsFinder, and one of 5,201 Decoration mods for NeoForge. 32,366 mods support Minecraft 1.21.1.

Decoration mods12,078NeoForge modsMods for 1.21.132,366

More from CoolGuyWithAPen

All projects
The random deadly keybind1.21.1 – 1.21.3Replace Enchantement1.21.1

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What the author says

With this mod, building becomes easy. Any blocks you've placed that you feel would be better off with another block now suddently becomes so much easier as now you just gotta follow these simple steps: - Enable - Break - Replace With steps this easy, you could replace a whole beach from sand to red sand or an oak…
CoolGuyWithAPen, on the Modrinth page

Official listing

Owner
CoolGuyWithAPen
Published
2026-03-23
Updated on Modrinth
2026-03-23
Facts verified
2026-10-15

Tags

DecorationGame mechanicsUtility
Open on ModrinthCompare