Main article: By default, 7-Zip creates 7z-format archives with a.7z. Each archive can contain multiple directories and files. As a container format, security or size reduction are achieved using a stacked combination of filters.

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Bomberman blast wii controls. These can consist of pre-processors,, and encryption filters. The core 7z compression uses a variety of, the most common of which are,,,. Developed by Pavlov, LZMA is a relatively new system, making its debut as part of the 7z format.

LZMA uses an LZ-based sliding dictionary of up to 4 GB in size, backed by a. The native 7z is open. Are stored as. In 2011, found that the 7z compression was at least 17% better than, and 7-Zip's own site has since 2002 reported that while compression ratio results are very dependent upon the data used for the tests, 'Usually, 7-Zip compresses to 7z format 30–70% better than to zip format, and 7-Zip compresses to zip format 2–10% better than most other zip-compatible programs.'

The 7z file format specification is distributed with the program's source code, in the 'doc' subdirectory. Others [ ] 7-Zip supports a number of other compression and non-compression archive formats (both for packing and unpacking), including,,,,. The utility also supports unpacking,,,,,,,,, MSLZ,,,,,,,, and archives and,,,,,,,,,.

7-Zip supports the ZIPX format for unpacking only. It has had this support since at least version 9.20, which was released in late 2010. 7-Zip can open some files, allowing access to the meta-files within along with the main contents.

Some Microsoft CAB ( compression) and (LZMA) installer formats can be opened. Similarly, some Microsoft executable programs (.) that are self-extracting archives or otherwise contain archived content (e.g., some setup files) may be opened as archives. When compressing ZIP or gzip files, 7-Zip uses its own encoder, which may achieve higher compression, but at lower speed, than the more common DEFLATE implementation. The 7-Zip deflate encoder implementation is available separately as part of the suite of tools. The decompression engine for archives was developed using freely available source code of the unRAR program, which has a licensing restriction against creation of a RAR compressor. 7-Zip v15.06 and later support extraction of files in the RAR5 format.

Some systems use formats supported by archiving programs such as 7-Zip; e.g., some backups are in tar format, and can be extracted by archivers such as 7-Zip. File manager [ ] 7-Zip comes with a file manager along with the standard archiver tools.