.JEM File Extension

2 file types use the .jem file extension.

JSON Entity Model File

Developer sp614x
3.8  |  12 Votes

What is a JEM file?

A JEM file contains entity model information used to alter models in Minecraft with the OptiFine mod tool installed. It stores information about the model in JSON format, which may include the path to a .PNG image that textures the model and information about various parts of the model.

More Information

Screenshot of a .jem file in Microsoft Notepad
JEM file open in Microsoft Notepad

You will most likely only encounter a JEM file if you are looking to alter the appearance of entities in Minecraft with the Optifine optimization mod installed. Some entities that Minecraft users modify include cows, creepers, dragons, chickens, books, and chests.

If you are looking to override an entity model, you can place the JEM file in the following directory in the resource pack:


Once the JEM file is placed in the directory, the model will appear in Minecraft as long as the OptiFine optimization mod is installed.

How to open a JEM file

You can open and edit JEM files with various model editors, such as Blockbench and Cubik Studio. These tools allow you to visualize the model while you edit JEM files.

Since JEM files are saved in plain text in JSON format, you can also open and edit the files with text editors. Keep in mind that you will not be able to view the models when editing them.

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Programs that open JEM files

Gogii Games Texture

Developer Gogii Games
3.0  |  2 Votes

A JEM file may also be a texture used in a Gogii Games video game, such as Princess Isabella 2 or Whispered Legends: Tales of Middleport. It is applied to a 3D model to give the appearance of skin, clothing, etc. JEM files are not intended to be opened by players.

More Information

Gogii Games is a Canadian video game developer known primarily for publishing hidden object and adventure games. The company uses the Kanji Game Engine to develop many of its games. Games developed using the Kanji Game Engine often store textures as JEM files.

How to open a JEM file

JEM files cannot be opened outside the games they are included in. However, you can use QuickBMS and the appropriate JEM .BMS script to convert JEM files to .DDS files. Then, you can open the DDS files in IrfanView, GIMP, or another program that supports DDS files.

Programs that open or reference JEM files

All Platforms
Various Gogii Games video games

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