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The Impossible LIbrary

A library mod that makes the impossible possible in Minecraft
by The_Computerizer
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2,293,889 downloads
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Updated Jun 30, 2026
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Changelog & Known Issues for 0.4.0

This mod was originally made to offer mod devs methods for doing things that are typically thought of as impossible, hacky, tedious, or maybe even require a third party java library. It now additionally serves as an API that can be used to load and run mods on multiple versions & mod loaders.

Supported Versions

The status indicators are as follows:

BROKEN → The API has been implemented in this version, but it is not yet able to load.

FUNCTIONAL → There are no known major issues specific to this version.

LOADABLE → The game can load in this version, but entering a world is not yet possible.

PLANNED → The API has not yet been implemented for this version, but it will be soon.

PLAYABLE → Worlds are able to load in this version, but there may be stability issues

Cleanroom

1.12.2 → PLANNED

Fabric/Quilt

1.16.5 → FUNCTIONAL

1.18.2 → FUNCTIONAL

1.19.2 → FUNCTIONAL

1.19.4 → FUNCTIONAL

1.20.1 → FUNCTIONAL

1.20.4 → FUNCTIONAL

1.20.6 → FUNCTIONAL

1.21.1 → FUNCTIONAL

1.21.4 → PLANNED

Forge

1.12.2 → FUNCTIONAL

1.16.5 → FUNCTIONAL

1.18.2 → FUNCTIONAL

1.19.2 → FUNCTIONAL

1.19.4 → FUNCTIONAL

1.20.1 → FUNCTIONAL

1.20.4 → BROKEN

1.20.6 → BROKEN

1.21.1 → FUNCTIONAL

1.21.4 → PLANNED

NeoForge

1.20.1 → FUNCTIONAL

1.20.4 → PLAYABLE

1.20.6 → FUNCTIONAL

1.21.1 → FUNCTIONAL

1.21.4 → PLANNED

Getting Started

Features

I will be writing a more in-depth wiki at some point, but in the meantime here are a few helpful things you can do:

  • Easier file creation and manipulation
  • Generic image rendering to the screen
  • Global nbt data storage and retrieval
  • Support for radial gui elements and some helper methods regarding that
  • Custom async tick events able set by millisecond

Issues & the Discord Server for my mods

You are free to use this mod in a modpack, server, video, or anything that links back to this page or the Modrinth page with proper credit. Posting it to rehosting sites like 9minecraft is not cool.

The Impossible Library
MC Client, 1.16.5, 1.19.4, Fabric, 1.20.1, Forge, 1.20.6, 1.21.1, 1.20.4, 1.18.2, 1.19.2, NeoForge, Server, 1.12.2, Quilt
Alpha 2025-11-22 Get
theimpossiblelibrary-0.4.6.jar
MC Client, 1.16.5, 1.19.4, Fabric, 1.20.1, Forge, 1.20.6, 1.21.1, 1.20.4, 1.18.2, 1.19.2, NeoForge, Server, 1.12.2, Quilt
Alpha 2025-11-19 Get
theimpossiblelibrary-0.4.5.jar
MC 1.19.4, Fabric, Client, 1.16.5, 1.18.2, 1.19.2, NeoForge, 1.20.1, Forge, 1.20.6, 1.20.4, 1.21.1, Server, 1.12.2, Quilt
Alpha 2025-07-13 Get
theimpossiblelibrary-0.4.4.jar
MC 1.19.4, Fabric, Client, 1.16.5, 1.18.2, 1.19.2, NeoForge, 1.20.1, Forge, 1.20.6, 1.20.4, 1.21.1, Server, 1.12.2, Quilt
Alpha 2025-04-16 Get
theimpossiblelibrary-0.4.3.jar
MC 1.19.4, Fabric, Client, 1.16.5, 1.18.2, 1.19.2, NeoForge, 1.20.1, Forge, 1.20.6, 1.20.4, 1.21.1, Server, 1.12.2, Quilt
Alpha 2025-04-14 Get
theimpossiblelibrary-0.4.2.jar
MC 1.19.4, Fabric, Client, 1.16.5, 1.18.2, 1.19.2, NeoForge, 1.20.1, Forge, 1.20.6, 1.20.4, 1.21.1, Server, 1.12.2, Quilt
Alpha 2025-04-09 Get
theimpossiblelibrary-0.4.1.jar
MC 1.19.4, Fabric, Client, 1.16.5, 1.18.2, 1.19.2, NeoForge, 1.20.1, Forge, 1.20.6, 1.20.4, 1.21.1, Server, 1.12.2, Quilt
Alpha 2025-04-01 Get
theimpossiblelibrary-0.4.0.jar
MC 1.19.4, Fabric, Client, 1.16.5, 1.18.2, 1.19.2, NeoForge, 1.20.1, Forge, 1.20.6, 1.20.4, 1.21.1, Server, 1.12.2, Quilt
Alpha 2025-03-31 Get
theimpossiblelibrary-1.12.2-0.1.7.jar
MC Forge, 1.12.2
Beta 2022-12-07 Get
theimpossiblelibrary-1.12.2-0.1.6.jar
MC Forge, 1.12.2
Beta 2022-11-18 Get
theimpossiblelibrary-1.12.2-0.1.5.jar
MC Forge, 1.12.2
Beta 2022-11-16 Get
theimpossiblelibrary-1.12.2-0.1.4.jar
MC Forge, 1.12.2
Beta 2022-11-14 Get
theimpossiblelibrary-1.12.2-0.1.3.jar
MC Forge, 1.12.2
Beta 2022-11-13 Get
theimpossiblelibrary-1.12.2-0.1.2.jar
MC Forge, 1.12.2
Beta 2022-11-12 Get
theimpossiblelibrary-1.12.2-0.1.1.jar
MC Forge, 1.12.2
Beta 2022-11-09 Get
theimpossiblelibrary-1.12.2-0.1.0.jar
MC Forge, 1.12.2
Beta 2022-11-08 Get
theimpossiblelibrary-1.12.2-0.0.3.jar
MC Forge, 1.12.2
Alpha 2022-10-26 Get
theimpossiblelibrary-1.12.2-0.0.2.jar
MC Forge, 1.12.2
Alpha 2022-10-17 Get
theimpossiblelibrary-1.12.2-0.0.1.jar
MC Forge, 1.12.2
Alpha 2022-10-15 Get

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