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Minecraft versions with Fabric (after and including 1.14)

Install Fabric, then add OptiFine along with OptiFabric as mods.

Minecraft versions with Forge

Make sure the current OptiFine release supports Forge! Then just use OptiFine like any other Forge mod.

Minecraft versions without Forge or Fabric

.. or if OptiFine isn't updated to work with either.

As a JAR mod (before 1.13)

Make a new instance in MultiMC with the wanted version of Minecraft.
Install the same version in the Mojang launcher
Run the desired version of OptiFine as an installer and make it extract the JAR
Add the extracted JAR on the Version page of the instance (Add to Minecraft.jar)

As a JSON patch

Make a new instance in MultiMC with the wanted version of Minecraft.
Click Edit Instance - it should open the Version page of the instance.
Click Add Empty.
Set uid to optifine.OptiFine and name to OptiFine.
Select the newly created component and click Edit - this should open the file in a text editor.
Edit the JSON to look like one of the examples, then save the file.
Download OptiFine and save the jar file in <Instance>/libraries/. Create the libraries folder if it doesn't exist.

If you look at the whole path, it should be something like this:
```
.../MultiMC/instances/<Instance>/libraries/OptiFine_1.13_HD_U_E3_beta4.jar
```
Launch the instance from MultiMC

If the example doesn't fit the OptiFine version exactly, change the version. For example replace all occurences of 1.7.10_HD_U_E3 with 1.7.10_HD_U_F1.

You can use the version page to check the file for errors - obvious mistakes will show up in the Version page as soon as you click the Refresh button.

If the JSON file doesn't open in a text editor, make sure your operating system is set up to open .json files in one first.

Examples

Minecraft 1.19 with OptiFine 1.19_HD_U_H8_pre2

{
    "formatVersion": 1,
    "name": "OptiFine",
    "+libraries": [
        {
            "name": "net.minecraft:launchwrapper:of-2.3",
            "url": "https://files.multimc.org/maven/"
        },
        {
            "name": "optifine:OptiFine:1.19_HD_U_H8_pre2",
            "MMC-hint": "local",
            "MMC-filename": "preview_OptiFine_1.19_HD_U_H8_pre2.jar"
        }
    ],
    "+tweakers": [ "optifine.OptiFineTweaker" ],
    "mainClass": "net.minecraft.launchwrapper.Launch",
    "requires": [
        {
            "uid": "net.minecraft",
            "equals": "1.19"
        }
    ],
    "uid": "optifine.OptiFine",
    "version": "1.19_HD_U_H8_pre2"
}

Minecraft 1.18.1 with OptiFine 1.18.1_HD_U_H4

{
    "formatVersion": 1,
    "name": "OptiFine",
    "+libraries": [
        {
            "name": "net.minecraft:launchwrapper:of-2.3",
            "url": "https://files.multimc.org/maven/"
        },
        {
            "name": "optifine:OptiFine:1.18.1_HD_U_H4",
            "MMC-hint": "local",
            "MMC-filename": "OptiFine_1.18.1_HD_U_H4.jar"
        }
    ],
    "+tweakers": [ "optifine.OptiFineTweaker" ],
    "mainClass": "net.minecraft.launchwrapper.Launch",
    "requires": [
        {
            "uid": "net.minecraft",
            "equals": "1.18.1"
        }
    ],
    "uid": "optifine.OptiFine",
    "version": "1.18.1_HD_U_H4"
}

Minecraft 1.18 with OptiFine 1.18_HD_U_H3

{
    "formatVersion": 1,
    "name": "OptiFine",
    "+libraries": [
        {
            "name": "net.minecraft:launchwrapper:of-2.3",
            "url": "https://files.multimc.org/maven/"
        },
        {
            "name": "optifine:OptiFine:1.18_HD_U_H3",
            "MMC-hint": "local",
            "MMC-filename": "OptiFine_1.18_HD_U_H3.jar"
        }
    ],
    "+tweakers": [ "optifine.OptiFineTweaker" ],
    "mainClass": "net.minecraft.launchwrapper.Launch",
    "requires": [
        {
            "uid": "net.minecraft",
            "equals": "1.18"
        }
    ],
    "uid": "optifine.OptiFine",
    "version": "1.18_HD_U_H3"
}

Minecraft 1.13.2 with OptiFine 1.13.2_HD_U_E4

{
    "formatVersion": 1,
    "+libraries": [
        {
            "name": "net.minecraft:launchwrapper:1.12"
        },
        {
            "name": "optifine:OptiFine:1.13.2_HD_U_E4",
            "MMC-hint": "local",
            "MMC-filename": "OptiFine_1.13.2_HD_U_E4.jar"
        }
    ],
    "+tweakers": [ "optifine.OptiFineTweaker" ],
    "fileId": "optifine.OptiFine",
    "mainClass": "net.minecraft.launchwrapper.Launch",
    "requires": [
        {
            "uid": "net.minecraft",
            "equals": "1.13.2"
        }
    ],
    "name": "OptiFine",
    "version": "1.13.2_HD_U_E4"
}

Minecraft 1.13.1 with OptiFine 1.13.1_HD_U_E4

{
    "formatVersion": 1,
    "+libraries": [
        {
            "name": "net.minecraft:launchwrapper:1.12"
        },
        {
            "name": "optifine:OptiFine:1.13.1_HD_U_E4",
            "MMC-hint": "local",
            "MMC-filename": "OptiFine_1.13.1_HD_U_E4.jar"
        }
    ],
    "+tweakers": [ "optifine.OptiFineTweaker" ],
    "fileId": "optifine.OptiFine",
    "mainClass": "net.minecraft.launchwrapper.Launch",
    "requires": [
        {
            "uid": "net.minecraft",
            "equals": "1.13.1"
        }
    ],
    "name": "OptiFine",
    "version": "1.13.1_HD_U_E4"
}

Minecraft 1.13 with OptiFine 1.13_HD_U_E4

{
    "formatVersion": 1,
    "+libraries": [
        {
            "name": "net.minecraft:launchwrapper:1.12"
        },
        {
            "name": "optifine:OptiFine:1.13_HD_U_E4",
            "MMC-hint": "local",
            "MMC-filename": "OptiFine_1.13_HD_U_E4.jar"
        }
    ],
    "+tweakers": [ "optifine.OptiFineTweaker" ],
    "fileId": "optifine.OptiFine",
    "mainClass": "net.minecraft.launchwrapper.Launch",
    "requires": [
        {
            "uid": "net.minecraft",
            "equals": "1.13"
        }
    ],
    "name": "OptiFine",
    "version": "1.13_HD_U_E4"
}

Minecraft 1.12.2

{
    "formatVersion": 1,
    "+libraries": [
        {
            "name": "net.minecraft:launchwrapper:1.12"
        },
        {
            "name": "optifine:OptiFine:1.12.2_HD_U_E2",
            "MMC-hint": "local",
            "MMC-filename": "OptiFine_1.12.2_HD_U_E2.jar"
        }
    ],
    "+tweakers": [ "optifine.OptiFineTweaker" ],
    "fileId": "optifine.OptiFine",
    "mainClass": "net.minecraft.launchwrapper.Launch",
    "requires": [
        {
            "uid": "net.minecraft",
            "equals": "1.12.2"
        }
    ],
    "name": "OptiFine",
    "version": "1.12.2_HD_U_E2"
}

Minecraft 1.12.1

{
    "formatVersion": 1,
    "+libraries": [
        {
            "name": "net.minecraft:launchwrapper:1.12"
        },
        {
            "name": "optifine:OptiFine:1.12.1_HD_U_C7",
            "MMC-hint": "local",
            "MMC-filename": "OptiFine_1.12.1_HD_U_C7.jar"
        }
    ],
    "+tweakers": [ "optifine.OptiFineTweaker" ],
    "fileId": "optifine.OptiFine",
    "mainClass": "net.minecraft.launchwrapper.Launch",
    "requires": [
        {
            "uid": "net.minecraft",
            "equals": "1.12.1"
        }
    ],
    "name": "OptiFine",
    "version": "1.12.1_HD_U_C7"
}

Minecraft 1.12

{
    "formatVersion": 1,
    "+libraries": [
        {
            "name": "net.minecraft:launchwrapper:1.12"
        },
        {
            "name": "optifine:OptiFine:1.12_HD_U_C7",
            "MMC-hint": "local",
            "MMC-filename": "OptiFine_1.12_HD_U_C7.jar"
        }
    ],
    "+tweakers": [ "optifine.OptiFineTweaker" ],
    "fileId": "optifine.OptiFine",
    "mainClass": "net.minecraft.launchwrapper.Launch",
    "requires": [
        {
            "uid": "net.minecraft",
            "equals": "1.12"
        }
    ],
    "name": "OptiFine",
    "version": "1.12_HD_U_C7"
}

Minecraft 1.11.2

{
    "formatVersion": 1,
    "+libraries": [
        {
            "name": "net.minecraft:launchwrapper:1.12"
        },
        {
            "name": "optifine:OptiFine:1.11.2_HD_U_C7",
            "MMC-hint": "local",
            "MMC-filename": "OptiFine_1.11.2_HD_U_C7.jar"
        }
    ],
    "+tweakers": [ "optifine.OptiFineTweaker" ],
    "fileId": "optifine.OptiFine",
    "mainClass": "net.minecraft.launchwrapper.Launch",
    "requires": [
        {
            "uid": "net.minecraft",
            "equals": "1.11.2"
        }
    ],
    "name": "OptiFine",
    "version": "1.11.2_HD_U_C7"
}

Minecraft 1.11

{
    "formatVersion": 1,
    "+libraries": [
        {
            "name": "net.minecraft:launchwrapper:1.12"
        },
        {
            "name": "optifine:OptiFine:1.11_HD_U_C7",
            "MMC-hint": "local",
            "MMC-filename": "OptiFine_1.11_HD_U_C7.jar"
        }
    ],
    "+tweakers": [ "optifine.OptiFineTweaker" ],
    "fileId": "optifine.OptiFine",
    "mainClass": "net.minecraft.launchwrapper.Launch",
    "requires": [
        {
            "uid": "net.minecraft",
            "equals": "1.11"
        }
    ],
    "name": "OptiFine",
    "version": "1.11_HD_U_C7"
}

Minecraft 1.10.2

{
    "formatVersion": 1,
    "+libraries": [
        {
            "name": "net.minecraft:launchwrapper:1.12"
        },
        {
            "name": "optifine:OptiFine:1.10.2_HD_U_E7",
            "MMC-hint": "local",
            "MMC-filename": "OptiFine_1.10.2_HD_U_E7.jar"
        }
    ],
    "+tweakers": [ "optifine.OptiFineTweaker" ],
    "fileId": "optifine.OptiFine",
    "mainClass": "net.minecraft.launchwrapper.Launch",
    "requires": [
        {
            "uid": "net.minecraft",
            "equals": "1.10.2"
        }
    ],
    "name": "OptiFine",
    "version": "1.10.2_HD_U_E7"
}

Minecraft 1.10

{
    "formatVersion": 1,
    "+libraries": [
        {
            "name": "net.minecraft:launchwrapper:1.12"
        },
        {
            "name": "optifine:OptiFine:1.10_HD_U_E7",
            "MMC-hint": "local",
            "MMC-filename": "OptiFine_1.10_HD_U_E7.jar"
        }
    ],
    "+tweakers": [ "optifine.OptiFineTweaker" ],
    "fileId": "optifine.OptiFine",
    "mainClass": "net.minecraft.launchwrapper.Launch",
    "requires": [
        {
            "uid": "net.minecraft",
            "equals": "1.10"
        }
    ],
    "name": "OptiFine",
    "version": "1.10_HD_U_E7"
}

Minecraft 1.9.4

{
    "formatVersion": 1,
    "+libraries": [
        {
            "name": "net.minecraft:launchwrapper:1.12"
        },
        {
            "name": "optifine:OptiFine:1.9.4_HD_U_E7",
            "MMC-hint": "local",
            "MMC-filename": "OptiFine_1.9.4_HD_U_E7.jar"
        }
    ],
    "+tweakers": [ "optifine.OptiFineTweaker" ],
    "fileId": "optifine.OptiFine",
    "mainClass": "net.minecraft.launchwrapper.Launch",
    "requires": [
        {
            "uid": "net.minecraft",
            "equals": "1.9.4"
        }
    ],
    "name": "OptiFine",
    "version": "1.9.4_HD_U_E7"
}

Minecraft 1.9.2

{
    "formatVersion": 1,
    "+libraries": [
        {
            "name": "net.minecraft:launchwrapper:1.12"
        },
        {
            "name": "optifine:OptiFine:1.9.2_HD_U_E3",
            "MMC-hint": "local",
            "MMC-filename": "OptiFine_1.9.2_HD_U_E3.jar"
        }
    ],
    "+tweakers": [ "optifine.OptiFineTweaker" ],
    "fileId": "optifine.OptiFine",
    "mainClass": "net.minecraft.launchwrapper.Launch",
    "requires": [
        {
            "uid": "net.minecraft",
            "equals": "1.9.2"
        }
    ],
    "name": "OptiFine",
    "version": "1.9.2_HD_U_E3"
}

Minecraft 1.9

{
    "formatVersion": 1,
    "+libraries": [
        {
            "name": "net.minecraft:launchwrapper:1.12"
        },
        {
            "name": "optifine:OptiFine:1.9.0_HD_U_E7",
            "MMC-hint": "local",
            "MMC-filename": "OptiFine_1.9.0_HD_U_E7.jar"
        }
    ],
    "+tweakers": [ "optifine.OptiFineTweaker" ],
    "fileId": "optifine.OptiFine",
    "mainClass": "net.minecraft.launchwrapper.Launch",
    "requires": [
        {
            "uid": "net.minecraft",
            "equals": "1.9"
        }
    ],
    "name": "OptiFine",
    "version": "1.9.0_HD_U_E7"
}

Minecraft 1.8.9

{
    "formatVersion": 1,
    "+libraries": [
        {
            "name": "net.minecraft:launchwrapper:1.12"
        },
        {
            "name": "optifine:OptiFine:1.8.9_HD_U_I3",
            "MMC-hint": "local",
            "MMC-filename": "OptiFine_1.8.9_HD_U_I3.jar"
        }
    ],
    "+tweakers": [ "optifine.OptiFineTweaker" ],
    "fileId": "optifine.OptiFine",
    "mainClass": "net.minecraft.launchwrapper.Launch",
    "requires": [
        {
            "uid": "net.minecraft",
            "equals": "1.8.9"
        }
    ],
    "name": "OptiFine",
    "version": "1.8.9_HD_U_I3"
}

Minecraft 1.8.8

This one is currently broken. The 1.8.8 download is 1.8.9 and it fails to load.

Minecraft 1.8

{
    "formatVersion": 1,
    "+libraries": [
        {
            "name": "net.minecraft:launchwrapper:1.12"
        },
        {
            "name": "optifine:OptiFine:1.8.0_HD_U_I3",
            "MMC-hint": "local",
            "MMC-filename": "OptiFine_1.8.0_HD_U_I3.jar"
        }
    ],
    "+tweakers": [ "optifine.OptiFineTweaker" ],
    "fileId": "optifine.OptiFine",
    "mainClass": "net.minecraft.launchwrapper.Launch",
    "requires": [
        {
            "uid": "net.minecraft",
            "equals": "1.8"
        }
    ],
    "name": "OptiFine",
    "version": "1.8.0_HD_U_I3"
}

Minecraft 1.7.10

{
    "formatVersion": 1,
    "+libraries": [
        {
            "name": "net.minecraft:launchwrapper:1.12"
        },
        {
            "name": "optifine:OptiFine:1.7.10_HD_U_E3",
            "MMC-hint": "local",
            "MMC-filename": "OptiFine_1.7.10_HD_U_E3.jar"
        }
    ],
    "+tweakers": [ "optifine.OptiFineTweaker" ],
    "fileId": "optifine.OptiFine",
    "mainClass": "net.minecraft.launchwrapper.Launch",
    "requires": [
        {
            "uid": "net.minecraft",
            "equals": "1.7.10"
        }
    ],
    "name": "OptiFine",
    "version": "1.7.10_HD_U_E3"
}

Minecraft 1.7.2

{
    "formatVersion": 1,
    "+libraries": [
        {
            "name": "net.minecraft:launchwrapper:1.12"
        },
        {
            "name": "optifine:OptiFine:1.7.2_HD_U_F3",
            "MMC-hint": "local",
            "MMC-filename": "OptiFine_1.7.2_HD_U_F3.jar"
        }
    ],
    "+tweakers": [ "optifine.OptiFineTweaker" ],
    "fileId": "optifine.OptiFine",
    "mainClass": "net.minecraft.launchwrapper.Launch",
    "requires": [
        {
            "uid": "net.minecraft",
            "equals": "1.7.2"
        }
    ],
    "name": "OptiFine",
    "version": "1.7.2_HD_U_F3"
}

Troubleshooting and FAQ

java.lang.ClassDefNotFound: ...: make sure that the path to OptiFine that's outputted on the console is actually pointing to the file you downloaded.
This broke my game!: You can always remove the patch and it's as if it was never there...

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