NSP Box 4.0.0 — Meet NUP

Smaller archives, flexible packaging, and more control over your game collection. Version 4.0 introduces NUP Tools, alongside the existing NSP builder.

Package more. Store less.

• Create compressed NUP archives from extracted game folders, with base games, updates and DLC together in one file.
• Choose your balance: Fast for quicker compression, Balanced for everyday use, or Smaller for stronger compression. Incompressible files are stored raw automatically.
• Keep what you need: select Base, Updates and DLC independently. Choices appear after inspection, only for content present in your source. Latest-snapshot mode merges the newest selected update with the selected base, retains required base-only files, and leaves superseded versions behind. Turn it off to keep separate base/update records.
• Avoid duplicate storage: identical file contents can share the same space inside an archive.
• Stay compatible: leave files larger than 256 MiB uncompressed to reduce temporary decompression work in supported emulators.

Convert, extract and check

• NSP → NUP: compress plaintext NSPs created by NSP Box.
• NUP → NSP: reconstruct complete game snapshots and export DLC as separate installable NSPs.
• NUP → Folder: extract your selected content back into folders.
• Inspect / Verify: check metadata, compression statistics and file integrity.
• Make it yours: add a custom title and square-cropped artwork when packaging folders.

Operations include progress and cancellation. Results save beside the source, with numbered filenames protecting existing outputs.

Fixes and compatibility

• Faster source inspection, reused file indexes and less duplicate compression work.
• Removed the artificial 32 GiB NSP limit; format, filesystem and free-space limits still apply. Thanks to @hlebushekhub for reporting #8.
• Fixed the Zstandard “Frame requires too much memory” decoding error.
• Updated guidance for PokeDinner 2.5.0, which includes native NSP support without the patch or external main.npdm.

Thanks to a55uka and the NUP project for the format specification and documentation, and Franseven, PokeDinner’s creator, for integrating native support.

NUP loading and DLC mounting depend on your emulator. Separate DLC NSPs remain available where needed.

Help shape the next build. Version 4.0 is experimental and has limited testing. If something breaks, open an issue with your app/emulator versions and reproduction steps. Please keep games, keys and personal information out of reports.

Piracy is not supported. This independent project is not affiliated with Nintendo. Nintendo and other rights holders retain ownership of their content and marks. No games, firmware or retail keys are included. See DISCLAIMER.md.