Optifine does need Java. Just like all other mods, the Optifine installer is a .jar file. But you can install it without Java as well, on Windows and on Mac as well, although Linux users will still need Java. Open Command Prompt on Windows or Terminal on Java. Enter the corresponding paths depending on your PC, Mac - ~/Library/Application Support/minecraft/runtime/jre-x64/jre.bundle/Contents/Home/bin/java Windows 32-bit – \\Program Files (x86)\\Minecraft Launcher\\runtime\\jre-x86\\bin\\java.exe Windows 64-bit - \\Program Files (x86)\\Minecraft Launcher\\runtime\\jre-x64\\bin\\java.exe Add ‘-jar’ to the path and make sure there is an additional space before and after it. Now, drag your Optifine .jar installer file and drop it into the box. Note that this should autofill after -jar. Now, press Enter to install Optifine and play Minecraft with it.