Stack Size Fix

Makes item counts for items with invalid stack sizes visible.

2.4K Downloads

fabricneoforgeutility

Rent Server with this Mod

About this Mod

Makes item counts for items with invalid stack sizes visible.

Useful for playing old worlds on newer versions, where you might have "overstacked" items, but since 1.20.5 you haven't been able to see their actual count when they're not in your inventory.

Also useful on any server that sends invalid item stack sizes, like some Hypixel GUIs.

For shulker boxes specifically, Tweakeroo includes a client-side fix, and Stackable Shulkers Fix contains a server-side fix. If that's all you're after, and you use one of those mods, then this mod is not needed.

Without mod	With mod

Available Versions

Stack Size Fix 1.0.0+26.1-fabricrelease

MC 26.1, 26.1.1, 26.1.2fabric

April 1, 2026

Stack Size Fix 1.0.0+26.1-neoforgerelease

MC 26.1, 26.1.1, 26.1.2neoforge

April 1, 2026

Stack Size Fix 1.0.0-fabricrelease

MC 1.20.5, 1.20.6, 1.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4, 1.21.5, 1.21.6, 1.21.7, 1.21.8, 1.21.9, 1.21.10, 1.21.11fabric

May 15, 2025

Stack Size Fix 1.0.0-neoforgerelease

MC 1.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4, 1.21.5, 1.21.6, 1.21.7, 1.21.8, 1.21.9, 1.21.10, 1.21.11neoforge

May 15, 2025

How to Install Stack Size Fix 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 (26.1.2).

Install Mod

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

Compatibility

Mod Loaders

fabricneoforge

Minecraft Versions

26.1.2, 26.1.1, 26.1 (+14 more)

Server-side

✗ Unsupported

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

Stack Size Fix 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 (26.1.2). You can switch loaders with one click in the panel.

Is Stack Size Fix compatible with fabric and neoforge?

Stack Size Fix officially supports fabric, neoforge for Minecraft 26.1.2, 26.1.1, 26.1. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with Stack Size Fix – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Stack Size Fix 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.