StackSize
Allows you to adjust max stack sizes with a Fabric mod.
Screenshots
About this Mod
ㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤ
ㅤ
ㅤㅤㅤㅤㅤㅤㅤㅤㅤStackSize
❓ How To Use
Simply change the values in the config, or add new item types
ㅤㅤㅤㅤㅤㅤAfter this, you shouldn't be able to go past the specified stack limits, this counts for picking up items, clicking in the inventory etc.
As of v1.2, you can also edit stack limits with the /stacksize command in-game, however, this requires op.
(NOTE: going over 64 does technically work but it's extremely buggy unless using the mod client side too)
if you have any issues, join the discord.
Available Versions
How to Install StackSize on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.11).
Install Mod
Open the mod browser in the dashboard and search for "StackSize". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.11, 1.21.10, 1.21.9 (+10 more)
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
StackSize server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.11). You can switch loaders with one click in the panel.
Is StackSize compatible with fabric?
StackSize officially supports fabric for Minecraft 1.21.11, 1.21.10, 1.21.9. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with StackSize – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if StackSize 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.
Similar Mods
Rent Modded Server
Install StackSize with just one click on your server.