# 7zr > File archiver with a high compression ratio. > Similar to `7z` except that it only supports `.7z` files. > More information: . - [a]rchive a file or directory: `7zr a {{path/to/archive.7z}} {{path/to/file_or_directory}}` - Encrypt an existing archive (including file names): `7zr a {{path/to/encrypted.7z}} -p{{password}} -mhe={{on}} {{path/to/archive.7z}}` - E[x]tract an archive preserving the original directory structure: `7zr x {{path/to/archive.7z}}` - E[x]tract an archive to a specific directory: `7zr x {{path/to/archive.7z}} -o{{path/to/output}}` - E[x]tract an archive to `stdout`: `7zr x {{path/to/archive.7z}} -so` - [l]ist the contents of an archive: `7zr l {{path/to/archive.7z}}` - Set the level of compression (higher means more compression, but slower): `7zr a {{path/to/archive.7z}} -mx={{0|1|3|5|7|9}} {{path/to/file_or_directory}}`