Splat to SPZ Converter

The uncompressed .splat format is great for simple web shaders, but at 32 bytes per Gaussian, a 2 million point scan still occupies 64 MB of storage.

Converting .splat into Niantic SPZ applies specialized attribute quantization and zlib stream compression, dropping that same scene down to under 15 MB—an additional 75% reduction over standard splat files.

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Technical Comparison

[.splat 32-Byte Stream]
       │
       ├── Fixed-Point Coordinate Quantization
       ├── Octahedral Quaternion Compression
       └── Gzip / Deflate Stream Entropy Coding
       │
       ▼
[Niantic .spz Container (~7-10 Bytes per Splat)]

Dimension	Raw .splat	Niantic .spz	Improvement
Bytes / Gaussian	32 Bytes	~7 to 10 Bytes	~75% Smaller
Mobile Streaming	Moderate	Ultra-Fast	Ideal for 4G/5G mobile apps
Visual Quality	Standard 8-bit	Lossless Perceptual	Identical radiance fidelity

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How to Convert Splat to SPZ

1. Upload your .splat file to the FreeConvert3D converter.
2. Select SPZ as the target format.
3. Download the compressed .spz file instantly.