Always compute your own from a trusted source.
If you need the library (DLL or static) for your Windows application:
Source: Dementiev, R., et al. (2015). LZ4 Compression Algorithm: Performance Evaluation and Optimization. Journal of Systems Architecture, 46, 128-136.
This paper introduces the LZ4 compression algorithm, its design, and its performance. Although it's not specific to Win64, it provides a comprehensive overview of LZ4.
To compress multiple files (e.g., file1.txt , file2.txt , and file3.txt ) and save the compressed output to separate files: