Nsz

NSZ is a Homebrew-compatible compressor and decompressor for Nintendo Switch game packages. Written in Python, it losslessly compresses NSP and XCI dumps into smaller NSZ and XCZ formats, saving up to 80% storage space.

Features:

• High-ratio lossless block compression for Nintendo Switch NSP and XCI files
• Fast multithreaded compression and decompression powered by zstandard
• Preserves all file headers, signatures, and game metadata for homebrew loaders
• Batch processing mode for entire folders of game dumps
• Command-line utility easily integrated into backup and management pipelines