This project provides convenient VB6 wrappers for a variety of compression libraries, including...

• zLib -- https://github.com/madler/zlib
• zLib-ng -- https://github.com/Dead2/zlib-ng
• libdeflate -- https://github.com/ebiggers/libdeflate
• zstd -- https://github.com/facebook/zstd
• lz4 -- https://github.com/lz4/lz4
• brotli -- https://github.com/google/brotli
• ZipArchive (zero-dependency VB6 lib derived from PuTTY) -- https://github.com/wqweto/ZipArchive
• Microsoft Compression APIs (Win 8+ only) -- https://docs.microsoft.com/en-us/windows/desktop/cmpapi/-compression-portal

A small sample project allows you to compare compression time, decompression time, and compression ratio across all libraries. Drag+drop a file onto the text box to test it.

The bulk of this project is adopted from the PhotoDemon project which is BSD-licensed. The 3rd-party compression libraries used in this project have their own licenses; please refer to LICENSE.md for full details.