Anvil Swapper

A simple mod that adds a button to swap the items in an Anvil. It will also recommend a swap if it is cheaper.

8.2K Downloads

fabricutility

Rent Server with this Mod

Screenshots

About this Mod

Anvil Swapper is a simple mod that adds a button to swap the items in an Anvil, no matter if the inventory is full or not it will swap the items.

It will show a green swap arrow if the swap is recommended although this uses Vanilla Minecraft calculations thus it will only work on servers that use the Vanilla cost.

Available Versions

Anvil Swapper 1.5.1release

MC 1.21.9, 1.21.10, 1.21.11fabric

December 10, 2025

Anvil Swapper 1.5.0release

MC 1.21.6, 1.21.7, 1.21.8fabric

June 18, 2025

Anvil Swapper 1.4.0release

MC 1.21.5fabric

May 13, 2025

Anvil Swapper 1.3.0release

MC 1.21.2, 1.21.3, 1.21.4fabric

May 13, 2025

Anvil Swapper 1.2.0release

MC 1.21, 1.21.1fabric

June 19, 2024

How to Install Anvil Swapper 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 "Anvil Swapper". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

fabric

Minecraft Versions

1.21.11, 1.21.10, 1.21.9 (+17 more)

Server-side

✗ Unsupported

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

Anvil Swapper 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 Anvil Swapper compatible with fabric?

Anvil Swapper 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 Anvil Swapper – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Anvil Swapper 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.