Technical Format Comparison Verified Engineering Specs

LAS vs LAZ: ASPRS LiDAR Point Cloud Compression Compared

Technical comparison between uncompressed ASPRS LAS binary data and lossless LASzip compressed LAZ format.

The Executive Verdict

Choose LAZ for archiving, transmitting, and storing aerial LiDAR datasets (7x to 10x smaller files with zero loss of coordinates). Choose LAS when legacy GIS or CAD software cannot decompress LASzip archives.

Decompress LAZ to LAS LiDAR Online

Zero server uploads • In-browser WebAssembly • Free instant download

Technical Specification Matrix

Direct architectural comparison between LAS and LAZ

Feature / Metric	LAS Specification	LAZ Specification
Compression Algorithm	Uncompressed raw binary	Lossless LASzip arithmetic coding
Compression Ratio	1:1 (Raw baseline)	7:1 to 10:1 (Up to 90% reduction)
Data Precision Loss	0% (Raw coordinates)	0% (Lossless bit-for-bit exact reconstruction)
Typical 100M Point File Size	2.8 GB to 3.5 GB	300 MB to 450 MB
Direct Web Streaming	Slow (huge bandwidth penalty)	Fast (used in Potree, Cesium, and WebGL viewers)
ASPRS Standard Status	Official ASPRS Specification (v1.2 to v1.4)	De facto standard open-source compression (LASzip)

Decision Matrix: Which Format Should You Use?

Recommended format choices by practical real-world scenario

LiDAR Data Archiving & Cloud Storage Use LAZ

Reduces AWS S3 or Cloudflare R2 cloud storage and egress costs by up to 90% with zero loss of precision.

Legacy Desktop GIS (AutoCAD Civil 3D Older Versions) Use LAS

Directly ingests without requiring external LASzip decompression DLLs or plugins.

Web 3D Point Cloud Streaming (WebGL / Potree) Use LAZ

Loads significantly faster over consumer broadband and cellular networks due to compact byte transfers.

Fast Real-Time Point Cloud Processing Pipelines Use LAS

Eliminates CPU decompression overhead when memory bandwidth and disk read speed are unconstrained.

Frequently Asked Questions

Expert answers to common LAS vs LAZ questions

Does converting LAS to LAZ lose point coordinates or intensity values?

No. LASzip is a mathematically lossless compression scheme. When you decompress a LAZ file back to LAS, every X, Y, Z coordinate, GPS timestamp, intensity, return number, and classification byte is 100% bit-identical.

Can I convert LAZ files to LAS directly in the browser?

Yes. OpenFileConverter runs LASzip natively inside your browser via WebAssembly. You can decompress massive LAZ point cloud files with zero server uploads and complete data privacy.

What is the typical compression ratio for aerial LiDAR?

Typical airborne topographic LiDAR compresses at 7:1 to 10:1 (approx. 10% of original file size). Terrestrial laser scans with dense RGB color attributes achieve approximately 5:1 to 7:1 compression.

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