.wua Wii U Roms !link!

: Uses lossless compression to reduce folder sizes by roughly 25% or more compared to raw formats.

Using .wua files in Cemu is straightforward, especially in modern versions (1.27.1 or higher).

An open-source tool (written in Go) for converting Wii U content into WUA and extracting encrypted/decrypted NUS dumps. .wua wii u roms

Source: TechBaked‘s 2026 ROM site safety guide.

The most immediate impact is on your hard drive space. A full library of Wii U games takes up significant storage. By moving to .wua compression, users have reported slashing their total storage footprint by up to (approximately 20%) while simultaneously cleaning up hundreds of thousands of individual files, leaving just a simple list of game titles. : Uses lossless compression to reduce folder sizes

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Right-click the game (make sure it‘s the base entry) and select . A dialog will ask where to save the new .wua file. Choose your Wii U ROMs folder (e.g., Emulation/roms/wiiu ) and click Save. Source: TechBaked‘s 2026 ROM site safety guide

WUA files use lossless compression, significantly reducing the disk space required compared to raw disc images (.wud) or even some compressed formats like .wux.