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      • ModPack Format

      Estimated reading time: less than 1 minute

      Besides .mod.zip, ModLoader supports the .modpack binary format. .modpack is ModLoader’s custom binary Mod package format, for cases where size or load performance matters more.

      vs .mod.zip

      Feature.mod.zip.modpack
      FormatStandard ZipCustom binary
      Human-readableCan unpack and inspect with normal toolsBinary, needs dedicated tools
      SizeDepends on Zip compressionCan be tuned for Mod use
      PackagingManual or packModZip.jsModLoader toolchain

      Use Cases

      • Size: May yield smaller files in some cases
      • Load performance: Binary parsing can be faster than Zip decompression (implementation-dependent)
      • Toolchain: As an intermediate in ModLoader build pipelines
      Info

      For most Mod authors, .mod.zip is recommended: standard, widely supported, and packable with any Zip tool.

      How to Generate

      .modpack is produced by ModLoader’s packaging tools or build pipeline, not by hand. See ModLoader source for details.

      If you package Mods as .mod.zip, ModLoader will load them directly; conversion to .modpack is not required.