How To Change Max Stack Size Of Vanilla Items

Amer Zain

3 min read

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28-12-2024

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Modifying the maximum stack size of vanilla Minecraft items can significantly enhance gameplay, streamlining inventory management and altering the overall experience. This guide provides clear instructions on how to achieve this, focusing on both single-player and multiplayer scenarios. We will primarily focus on methods that don't require extensive modding expertise.

Understanding Stack Sizes in Minecraft

Vanilla Minecraft assigns a default stack size to each item. This limit, typically 64, governs the maximum number of identical items that can be placed in a single inventory slot. Changing this value requires modifying the game files or using external tools. It's important to note that altering stack sizes can significantly impact gameplay balance.

Method 1: Using Data Packs (Single-player and Server-side)

Data packs offer a relatively straightforward method to modify item stack sizes without resorting to complex modifications. This approach is ideal for both single-player worlds and multiplayer servers where you have administrator access.

Steps:

1. Create a new data pack: Navigate to your .minecraft folder (the location varies depending on your operating system). Within the saves folder, locate your world save. Inside, create a new folder named datapacks. Within datapacks, create another folder for your new data pack (e.g., "stacksize_mod").

2. Create the pack.mcmeta file: Inside the stacksize_mod folder, create a new file named pack.mcmeta. This file tells Minecraft about your data pack. Paste the following code into it, ensuring the correct version number:

{
  "pack": {
    "pack_format": <insert pack format number here>,
    "description": "Stack Size Modifier"
  }
}

(Replace <insert pack format number here> with the correct number. This can be found in the pack.mcmeta of other data packs you may have installed. It will typically correspond to the Minecraft version.)

3. Create the data folder: Inside stacksize_mod, create a folder called data.

4. Create the minecraft folder: Inside data, create another folder named minecraft.

5. Create the advancements folder: Inside minecraft, create a folder called advancements. (This step is crucial, even if you aren't modifying advancements directly).

6. Create the loot_tables folder: Inside minecraft, create a loot_tables folder.

7. Create the item folder: Inside loot_tables, create an items folder.

8. Modify Loot Tables: This is where you will adjust the stack sizes. You'll need to create (or modify) loot tables for each item you want to change. For example, to change the stack size of diamonds, you would create a file named diamonds.json within the items folder and add the following code. Remember to replace 999 with your desired stack size.

{
  "type": "minecraft:item",
  "pools": [
    {
      "rolls": 1,
      "entries": [
        {
          "type": "minecraft:item",
          "name": "minecraft:diamond",
          "functions": [
            {
              "function": "minecraft:set_count",
              "count": 999
            }
          ]
        }
      ]
    }
  ]
}

9. Repeat for Other Items: Repeat steps 7 and 8 for each item you wish to modify. You will need to create separate .json files for each.

10. Enable the Data Pack: Launch Minecraft and activate your newly created data pack in the world settings.

Important Note: Incorrectly formatted JSON files will prevent the data pack from loading. Ensure meticulous attention to detail, including proper bracket and comma placement.

Method 2: Using Mods (Requires Forge or Fabric)

For more advanced customization or greater ease of management, Minecraft modding APIs such as Forge or Fabric provide a simpler way to achieve large-scale stack size changes. Numerous mods exist specifically designed for this purpose. However, using mods requires more technical knowledge and involves installing additional software. This method is beyond the scope of this beginner guide.

Conclusion

Modifying item stack sizes in Minecraft offers a unique way to tailor the gameplay experience. The data pack method offers a safe and relatively straightforward way to achieve this for single-player worlds and servers you administer. Remember to always back up your world before making any significant changes.