Create New Archive

Use this dialog to set compression and encryption parameters for a 7-Zip archive.

Note: If the archive already exists, the title of this dialog box will be Add Files to Archive.

Options

Encrypt files, Password, Confirm password

When checked, files will be encrypted before being added to the archive file. Enter (and confirm) a password needed for decryption.

Compression level

Choose the compression level. You can use one of the following values:

Value	Description
Store	No compression is used; files are stored in the archive in their original size.
Fast	Fast compression.
Normal	Recommended level of compression.
Maximum	Better compression, but it is slower and requires more memory.
Ultra	Best compression, but it is even slower and requires even more memory.

Compression method

Select the compression method. You can use one of the following methods:

Method	Description
LZMA	7-Zip's default compression method. It provides a high compression ratio and very fast decompression.
PPMd	Dmitry Shkarin's PPMdH algorithm with small changes. It usually provides a high compression ratio and high speed for text files.

Dictionary size

Enter the dictionary size for the compression method. A higher dictionary size means better compression, but it is slower and requires more memory. Memory usage for LZMA compression is about 10 times the dictionary size. Memory usage for LZMA decompression is close to the value of the dictionary size. Memory usage for PPMd compression and decompression is almost equal to the dictionary size.

Word size

Enter the word length that will be used to find identical sequences of bytes for compression. Usually, for LZMA, a larger word size gives a slightly better compression ratio and a slower compression process. A larger word size parameter can significantly increase the compression ratio when files contain long identical sequences of bytes. For PPMd, word size has great significance. It strongly affects both the compression ratio and the compression/decompression speed.

Create solid archive

When checked, all files will be compressed as one continuous data stream. This usually improves the compression ratio.

Don't show this dialog box again (you can change it later in config dialog)

When checked, this dialog will not be displayed next time. You can change it in the 7-Zip configuration dialog box, see Display dialog box with extended options before packing.

Configure

Use this button to open the 7-Zip configuration dialog box.