Description
Gallery
Changelog
Versions
A NeoForge mod that allows changing item stacksize up to 2^31-1, with custom rules.
Scripting
https://github.com/MaiKokain/StackUpper/wiki/Scripting
Note
How to Install StackUpper (Mod)
StackUpper by Maikokain is verified for Neoforge across Minecraft versions 1.20.5, 1.20.6, 1.21, 1.21.1, 1.21.10, 1.21.11, 1.21.2, 1.21.3 (latest release: 2.1.0, file size: 362 KB). Follow the steps below to install it safely from ModCraft.tv:
- Click the Download button above and select your Minecraft version (1.20.5, 1.20.6, 1.21, 1.21.1, 1.21.10, 1.21.11, 1.21.2, 1.21.3) and platform (Neoforge).
- Make sure you have the compatible loader or environment installed for Neoforge.
- Move the downloaded StackUpper file into your Minecraft
.minecraft/modsfolder and launch the game.
All Versions
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[2.1.0] StackUpper 26.1-2.1.0
by Maikokain on Apr 16, 2026
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## Initial alpha release for Minecraft 26.1
[2.1.0] StackUpper 1.21.10-2.1.0
by Maikokain on Apr 13, 2026
Download
# 2.1.0
#### Client now syncs data from dedicated server instead on joining Multiplayer world.
#### Added a new command (
#### Added a new command called
#### Container interface now patched via Mixin instead of Core mod
#### On dedicated server, client now syncs config from server
# NOTE
### After stackupper
#### Client now syncs data from dedicated server instead on joining Multiplayer world.
#### Added a new command (
/stackupper generate_data_index) to generate item data file for future uses. (Web based script generator)#### Added a new command called
/stackupper_client, used for client debugging purposes only (requires stackupper.debug property)#### Container interface now patched via Mixin instead of Core mod
#### On dedicated server, client now syncs config from server
# NOTE
### After stackupper
2.1.0, Only 1.21, 1.21.1, 1.21.9, 1.21.10, are published, once 1.26 starts getting traction of a good base version (basically modpacks and mod developer developing only for that version) only 1.21, and 1.21.1 will be getting published
[2.1.0] StackUpper 1.21-2.1.0
by Maikokain on Apr 13, 2026
Download
# 2.1.0
#### Client now syncs data from dedicated server instead on joining Multiplayer world.
#### Added a new command (
#### Added a new command called
#### Container interface now patched via Mixin instead of Core mod
#### On dedicated server, client now syncs config from server
# NOTE
### After stackupper
#### Client now syncs data from dedicated server instead on joining Multiplayer world.
#### Added a new command (
/stackupper generate_data_index) to generate item data file for future uses. (Web based script generator)#### Added a new command called
/stackupper_client, used for client debugging purposes only (requires stackupper.debug property)#### Container interface now patched via Mixin instead of Core mod
#### On dedicated server, client now syncs config from server
# NOTE
### After stackupper
2.1.0, Only 1.21, 1.21.1, 1.21.9, 1.21.10, are published, once 1.26 starts getting traction of a good base version (basically modpacks and mod developer developing only for that version) only 1.21, and 1.21.1 will be getting published
[2.0.10] StackUpper 1.21.8-2.0.10
by Maikokain on Mar 11, 2026
Download
Add Loading event to config. (Fixes client side inventory on multiplayer server)
[2.0.10] StackUpper 1.21.4-2.0.10
by Maikokain on Mar 11, 2026
Download
Add Loading event to config. (Fixes client side inventory on multiplayer server)
[2.0.10] StackUpper 1.21-2.0.10
by Maikokain on Mar 11, 2026
Download
Add Loading event to config. (Fixes client side inventory on multiplayer server)
[2.0.9] StackUpper 1.21.10-2.0.9
by Maikokain on Jan 06, 2026
Download
Initial release for 1.21.9+
Everything worked fine when I tried however,
# Open an issue on GitHub or Discord if things doesn't work as expected.
Everything worked fine when I tried however,
# Open an issue on GitHub or Discord if things doesn't work as expected.
[2.0.9] StackUpper 1.21.6-2.0.9
by Maikokain on Jan 05, 2026
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Support for Mekanism and minor changes.
[2.0.9] StackUpper 1.21.4-2.0.9
by Maikokain on Jan 05, 2026
Download
Support for Mekanism and minor changes.
[2.0.9] StackUpper 1.21-2.0.9
by Maikokain on Jan 05, 2026
Download
Support for Mekanism and minor changes.
[2.0.8] StackUpper 1.21.6-2.0.8
by Maikokain on Nov 01, 2025
Download
Fixed serverside crash.
[NOTE]
The mod is not really made for multiplayer support, It can be used on the server however there might be a few issues.
Known issue:
[NOTE]
The mod is not really made for multiplayer support, It can be used on the server however there might be a few issues.
Known issue:
- Player creative inventory doesn't sync stack size with the server's stack size.
- idk, you tell me.
[2.0.8] StackUpper 1.21.4-2.0.8
by Maikokain on Nov 01, 2025
Download
Fixed serverside crash.
[NOTE]
The mod is not really made for multiplayer support, It can be used on the server however there might be a few issues.
Known issue:
[NOTE]
The mod is not really made for multiplayer support, It can be used on the server however there might be a few issues.
Known issue:
- Player creative inventory doesn't sync stack size with the server's stack size.
- idk, you tell me.
[2.0.8] StackUpper 1.21-2.0.8
by Maikokain on Nov 01, 2025
Download
Fixed serverside crash.
[NOTE]
The mod is not really made for multiplayer support, It can be used on the server however there might be a few issues.
Known issue:
[NOTE]
The mod is not really made for multiplayer support, It can be used on the server however there might be a few issues.
Known issue:
- Player creative inventory doesn't sync stack size with the server's stack size.
- idk, you tell me.
[2.0.7] StackUpper 1.21.6-2.0.7
by Maikokain on Oct 22, 2025
Download
- Optimization for supplying largest stack size to coremod.
- Add checks to methods accessing config before it loaded.
[2.0.7] StackUpper 1.21.4-2.0.7
by Maikokain on Oct 22, 2025
Download
- Optimization for supplying largest stack size to coremod.
- Add checks to methods accessing config before it loaded.
