While newer versions of zlib (like 1.3.x) have since been released, 1.2.13 remains a common reference point in legacy system updates and security documentation.

version offers superior compression ratios for users with the toolset installed. Key Technical Updates in 1.2.13

XZ files are significantly smaller than GZ files.

: Fixed block type selection logic when using Z_FIXED , resulting in better compression ratios.

zlib-1.2.13.tar.xz refers to the source code archive for version 1.2.13 of