X1.7z Apr 2026

When using 7-Zip via the command line, the -mx switch determines the compression level. The number following "x" (ranging from 0 to 9) dictates how hard the computer works to shrink the file: No compression (Store mode). x1: Fastest compression; uses a 1 MB window size . x5: Normal compression (Default).

It typically achieves 30–70% better compression than the standard ZIP format. When using 7-Zip via the command line, the

To create a fast archive using the "x1" level, the command would look like: 7z a archive.7z -mx1 source_folder . When using 7-Zip via the command line, the