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Animation Compression Library

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State of the art animation and curve compression codecs.

  • Supported Platforms
  • Supported Engine Versions
    4.25 - 4.27, 5.0 - 5.2
  • Download Type
    Engine Plugin
    This product contains a code plugin, complete with pre-built binaries and all its source code that integrates with Unreal Engine, which can be installed to an engine version of your choice then enabled on a per-project basis.

=== NOTE ===> This plugin is now distributed as part of Unreal Engine starting with UE 5.3, see here for details!

This plugin integrates the Animation Compression Library within Unreal Engine 4 and 5. It is suitable for every animation clip and platform as it features a low memory footprint, high accuracy, and very fast compression and decompression.

Compared to UE 5.2, the ACL plugin compresses up to 2.9x smaller, is up to 2x more accurate, up to 2x faster to compress, and up to 6.3x faster to decompress (results may vary depending on the platform and data).

The documentation on how to use it can be found here along with performance results.

Technical Details


  • Animation Sequence bone and curve compression codecs
  • Low memory footprint
  • Very fast compression and decompression
  • High accuracy
  • Progressive quality streaming

Code Modules:

  • ACLPlugin (Runtime)
  • ACLPluginEditor [Editor]

Number of Blueprints: 0

Number of C++ Classes: 10

Network Replicated: No

Supported Development Platforms: Every platform

Supported Target Build Platforms: Every platform


Example Project: ACL Playground