What is an LSS file?
The .LSS file extension primarily represents either a LimeSurvey Survey Structure file or a LiveSplit Splits file. Both of these common formats use XML to store their data. LimeSurvey uses .LSS files to export and share survey layouts, questions, and group structures. LiveSplit, a popular timer application for gamers, uses .LSS files to save speedrun segment times and run history.
Other software programs also use the .LSS extension for entirely different purposes. This includes McCarthy Taylor Partnership LSS land survey models, Teledyne LeCroy oscilloscope configurations, bootloader splash screen images, and even game data SQLite databases for titles like Goddess of Victory: Nikke.
How to open LSS files?
You can open a LimeSurvey Survey Structure file by importing it directly into the LimeSurvey administrative web interface. You can open LiveSplit Splits by loading the file into the LiveSplit desktop application. Because both of these primary formats are structured as plain XML, you can also inspect their raw code using text editors like Notepad++ or Visual Studio Code.
Best practices and troubleshooting
Because an .LSS file has multiple possible meanings, we recommend using viewer.online/lss to identify the actual format of your specific file. viewer.online/lss analyzes .LSS files to identify their exact format and creator software, shows which programs can open the file, and usually previews it. This prevents errors caused by trying to open an oscilloscope setup file in a speedrun timer.
If you need to change your data into a more accessible format, we recommend converting your file to standard target formats like CSV, JSON, or TXT using convert.guru.
Summary
viewer.online/lss directly opens and previews .LSS files in the browser, eliminating the need to install software or troubleshoot compatibility issues.