It appears that both .las and .laz files are used for LIDAR based data exchange formats, so a las to laz conversion is possible. You can convert las to laz using LASZip or similar utility designed exactly for this very purpose.
Home > Search converters: las to laz
Conversion of las file format to laz file format beta
Search for las to laz converter or software able to handle these file types.
Convert LIDAR data exchange to Compressed LiDAR data.
We have found 3 software records in our database eligible for .las to .laz file format conversion.
Microsoft Windows software 
- convert las to laz on Windows
LASZip
A LAS to LAZ converter
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from las file | No | No | No | No | No | Yes | No | No |
to laz file | No | No | No | No | No | No | Yes | No |
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned las to laz. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
LAStools
A set of productivity tools for LiDAR data files
Multiplatform software 
- convert las to laz on any platform
CloudCompare
A 3D point cloud processing software
Additional links: Open las file, Open laz file
LAS
An las file extension is related to the LIDAR data exchange file format used by various GIS programs.
LAZ
Files with laz file extension can be found as losslessly compressed variant of LiDAR exchange format.
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