English Chinese Simpl. Chinese Trad. Esperanto French German Japanese Portuguese Brazil Spanish Vietnamese 7z is the new archive format, providing high compression ratio. The main features of 7z format: Open architecture High compression ratio Strong AES-256 encryption Ability of using any compression, conversion or encryption method Supporting files with sizes up to 16000000000 GB Unicode file names Solid compressing Archive headers compressing High compression ratio Strong AES-256 encryption Ability of using any compression, conversion or encryption method Supporting files with sizes up to 16000000000 GB Unicode file names Solid compressing Archive headers compressing Strong AES-256 encryption Ability of using any compression, conversion or encryption method Supporting files with sizes up to 16000000000 GB Unicode file names Solid compressing Archive headers compressing Ability of using any compression, conversion or encryption method Supporting files with sizes up to 16000000000 GB Unicode file names Solid compressing Archive headers compressing Supporting files with sizes up to 16000000000 GB Unicode file names Solid compressing Archive headers compressing Unicode file names Solid compressing Archive headers compressing Solid compressing Archive headers compressing Archive headers compressing 7z has open architecture, so it can support any new compression methods. Now the following compression methods are integrated to 7z : 7z also supports filters that improve compression ratio of main compression method. Now the following filters are integrated to 7z :

LZMA is default and general compression method of 7z format. The main features of LZMA method: High compression ratio Variable dictionary size (up to 4 GB) Compressing speed: about 2-8 MB/s on 4 GHz CPU (2 cpu threads version). Decompressing speed: about 30-100 MB/s on 4 GHz CPU (1 cpu thread). Small memory requirements for decompressing (depend from dictionary size) Small code size for decompressing: about 5 KB Variable dictionary size (up to 4 GB) Compressing speed: about 2-8 MB/s on 4 GHz CPU (2 cpu threads version). Decompressing speed: about 30-100 MB/s on 4 GHz CPU (1 cpu thread). Small memory requirements for decompressing (depend from dictionary size) Small code size for decompressing: about 5 KB Compressing speed: about 2-8 MB/s on 4 GHz CPU (2 cpu threads version). Decompressing speed: about 30-100 MB/s on 4 GHz CPU (1 cpu thread). Small memory requirements for decompressing (depend from dictionary size) Small code size for decompressing: about 5 KB Decompressing speed: about 30-100 MB/s on 4 GHz CPU (1 cpu thread). Small memory requirements for decompressing (depend from dictionary size) Small code size for decompressing: about 5 KB Small memory requirements for decompressing (depend from dictionary size) Small code size for decompressing: about 5 KB Small code size for decompressing: about 5 KB 7-Zip also supports encryption with AES-256 algorithm. This algorithm uses cipher key with length of 256 bits. To create that key 7-Zip uses derivation function based on SHA-256 hash algorithm. A key derivation function produces a derived key from text password defined by user. For increasing the cost of exhaustive search for passwords 7-Zip uses big number of iterations to produce cipher key from text password. 7z code is a part of 7-Zip program distributed under the GNU LGPL. You can download 7-Zip sources and binaries from Download Page . Major part of 7z code is included to LZMA SDK . Applications that support 7z archives: WinRAR, PowerArchiver, TUGZip, IZArc. 7z at Wikipedia Copyright (C) 2026 Igor Pavlov.