What is an LS file?
An .LS file usually contains text instructions for industrial robots. FANUC Robotics uses this format for robot controller programs and error logs. However, the .LS extension has multiple possible meanings. It can be a LightWave LScript Source Code file created by LightWave Digital. Other software like RoboDK, Impro-Visor, Logseq, and the LINE Messenger app also use .LS files for scripts, lead sheets, backup data, and encryption keys. Many video games and modifications, such as the LSPDFR mod for *GTA V*, use the .LS format for game save data.
How to open LS files?
Because an .LS file has multiple possible meanings, you must know its exact format to open it correctly. You can open FANUC robot files with a simple text editor or specialized software like RoboDK. You can read LightWave LScript Source Code files using a code editor or LightWave 3D.
If you do not know the origin of your file, viewer.online/ls can analyze .LS files to identify the exact format and creator software, inspect the file structure, extract readable text, and check whether an online preview is available.
Best practices and troubleshooting
Always make a backup before you open or edit an unknown .LS file. If the file contains plain text, you can temporarily rename the extension to .TXT to view it easily. If you need to convert the file, we recommend file conversion to sensible target formats on convert.guru. You can often convert text-based .LS files to standard .TXT or .CSV formats depending on the data structure.
Summary
viewer.online/ls is useful for identifying, inspecting, and understanding .LS files without installing software or dealing with compatibility problems.