7-Zip

7-Zip(7z decompression software)It is a completely free compression and decompression software, like otherCompression softwareCompared with its compression speed, the compression rate is better. It not only supports many mainstream formats and hyper-threading, but also has a powerful AES-256 encryption algorithm that can encrypt files.Encryption, enhance file security. 7-Zip is a very practical compression and decompression software with compact software, simple interface, and you can download it from Huajun if you need it.

7-zip (7z decompression software) features

Open source and free

Completely free and open source (based on the GNU LGPL license), no ads, no paid version, suitable for long-term use by individuals and enterprises.

The code is transparent, security is jointly maintained by global developers, and there is no risk of backdoors or malicious behavior.

Ultra-high compression rate

7Z format: Using the LZMA/LZMA2 algorithm, the compression rate is 30%-50% higher than the traditional ZIP format (especially suitable for files with high redundancy such as text and code).

Actual measurement comparison:

Compress 1GB text file: 7Z format compresses to 50MB (ZIP ~150MB, RAR ~100MB).

Compressing a 10GB video file: The 7Z format only reduces the size by 5%-10% (because the video itself is compressed, but it is still faster than WinRAR).

Multi-platform support

Windows: Provides 32/64-bit installation version and portable version (no installation required, U disk runs directly).

Linux/macOS: The function is implemented through the command line tool p7zip (manual installation is required, and the graphical interface is relatively simple).

7-zip (7z decompression software) function

Compression function

Supported formats:

Compression is: 7Z, ZIP, TAR, GZ, BZ2, XZ, WIM.

Pack only: Pack directly into TAR format without compression (suitable for compressed files, such as MP4, JPG).

Volume compression: Split large files into multiple small volumes (such as 100MB per volume) for easy uploading or storage.

Encrypted compression:

Enable AES-256 encryption for ZIP/7Z compressed files (the password is recommended to be more than 12 characters, including uppercase and lowercase letters + numbers + symbols).

The 7Z format also supports encrypted file names (ZIP only encrypts file contents).

Decompression function

Supported formats:

Mainstream formats: 7Z, ZIP, RAR (decompression only, compressed RAR is not supported), TAR, ISO, DMG, GZ, BZ2, XZ.

Unpopular formats: ARJ, CAB, CHM, CPIO, CramFS, DEB, FAT, HFS, LZH, LZMA, MBR, MSI, NSIS, NTFS, RPM, SquashFS, UDF, VHD, WIM, XAR, Z.

Repair damaged archives: Try to repair partially damaged 7Z/ZIP files through the command line (success rate depends on the degree of damage).

Productivity tools

Right-click menu integration: Right-click in the file explorer and quickly select "Compress to", "Extract to", "Test compressed package" and other operations.

Batch operation: supports wildcard characters (such as *.jpg to compress images in batches).

Test the compressed package: Right-click the compressed package and select "Test" to check whether the file is damaged (to avoid decompression failure).

7-zip (7z decompression software) FAQ

      1. Use7-zipHow does software compress a large file to the smallest size?

​ ​ 1. First download and install the 7-zip software on this site, then click on the file you want to compressFileRight-click to check the source file size first, as shown in the figure below, and simply record it. Then we right-click on the large file that we want to compress and save, and select 7-zip-Add to compressed package. Then an "Add to archive" window will open.

​ ​ 2. Then we set the compression format in the compression window. Select maximum compression for the compression level and 7z for the compression format. Generally speaking, this format has the highest compression ratio and can compress the file as much as possible. Whether to encrypt or modify the compression path can be set according to your own needs. Here, the editor chooses the default option and does not make any changes. After setting it, we click OK. The software will compress the file. We just need to wait patiently.

3. After the compression is completed, we find the compressed package, right-click and click Properties. Here we see that the file size is much smaller than before. If you still want to shrink the compressed package, it will easily cause file damage, so users should choose carefully.

​ ​ 4. We also use 7-zip compression, and we compress the files in .zip format. Finally, the compression is completed. We can check the file size again. It can be clearly seen that the same file compression using 7z format can compress the file into a smaller size. If you need to compress large files as small as possible, you might as well try this method.

2. How to associate files with 7-Zip in Win7 and Vista?

Answer: Let 7-Zip associate files in Win7 and Vista toAdministratorJust run 7-Zip File Manager once. The method is very simple, you just need to right-click on the 7-Zip file manager icon, select "Run as Administrator", and then you can associate the file in the settings.

      3. Why can’t 7-zip open some ZIP archives?

Answer: The reason why 7-zip cannot open some ZIP compressed packages may be because the file header of the compressed package is incorrect. This is the case. The ZIP compressed package contains two file headers. Use 7-Zip to open the compressed package. It will first read both file headers. If any one of them contains an error,data, 7-Zip cannot open it. Other programs that support the ZIP format can open some files with errors.Compressed package, because those programs usually only read part of the file header, or the program has ignored the wrong data.

How to set 7-Zip as default software

Right-click on any compressed file (such as .zip, .rar) and select "Open with" → "Choose another application".

In the pop-up window, check "Always use this application to open .xxx files", select "7-Zip File Manager", and click "OK".

If you need to set all formats in batches, you can go to "Control Panel → Programs → Default Programs → Set Default Program", select 7-Zip and click "Select the default for this program", check all compression formats and confirm.

How to encrypt 7-Zip

Right-click the file/folder to be compressed and select "7-Zip→Add to compressed file".

In the pop-up window, find "Encryption” option, check “Encrypt file name” (optional, protect the file name from being viewed), enter the password and confirm.

The default encryption method is AES-256 (high security). Click "OK". The generated compressed package requires a password to be decompressed.

How to repair compressed files in 7-Zip

Open the 7-Zip software, find the damaged compressed package, right-click and select "Repair Compressed File".

In the pop-up window, select the save path of the repaired file (the default is the same directory as the original file) and click "OK".

After the repair is completed, a file named "rebuilt.original file name" will be generated.Compressionpackage, try to decompress the file.

How to compress files into several packages with 7-Zip (volume compression)

Right-click the target file/folder and select "7-Zip→Add to compressed file".

Select a default size (such as 100M, 500M) in the "Volume Size" drop-down menu, or manually enter a value (the unit supports MB, GB, etc., such as "200M").

Click "OK", multiple volume files ending with ".001, .002..." will be generated. When decompressing, all volumes must be placed in the same folder.Directory, double-click the first volume to automatically merge and decompress.

7-Zip (7z decompression software) software features

Open source, free and transparent‌

Distributed under the GNU LGPL license, users can use, customize and modify it for free. The source code is open, ensuring software transparency and security, with no ads or bundled software.

‌Resource usage optimization‌

The size of the installation package is only 1-2.84MB, and the running time memory and CPU usage are low, making it suitable for multi-tasking environments. Fast compression, high decompression efficiency, saving time.

‌Format Compatibility and Extensibility‌

Supports solid compression, file header compression and Unicode file names, compatible with any compression, conversion, and encryptionalgorithm. Supports file compression of up to 16,000,000,000 GB to meet large-scale data processing needs.

7-Zip (7z decompression software) installation steps   

​ ​ 1. Download the 7-ZIP software package in Huajun Software Park. After downloading, you will get a 7-zip18 software package. Then after we decompress it, we will see two .exe files as shown in Figure 2: 7z1805.exe is a 32-bit program, and 7z1805-x64.exe is a 64-bit program.

​​ 2. You can first check what bit system your computer is, click "My Computer" on the desktop, right-click Properties, you can see it in the system type column as shown in the figure below, and then choose to install 7-zip according to the specifications. The editor's computer is a 32-bit operating system, and the installation instructions are based on it below.

3. Double-click 7z1805.exe to run, and then start preparing for installation. "Destination folder" means the installation path. We can see that the program is installed on the C drive by default. You can click "install", then the program will be installed automatically. However, the editor recommends that you do not install it on the C drive, as this may occupy system disk resources and affect the computer's running speed and software usage. Click the button with three dots on the right side of the path to browse the customizable installation directory. After selecting the path, click "OK".

​​ 4. When we return to the installation interface, we can see that the installation path has been modified to the path defined by ourselves. Click "install" to continue the installation; click "cancel" to cancel the installation.

5. Click "install" to start the installation. The software installation speed is very fast, and it will be completed after a few seconds. After the installation is completed, click "close" to close the installation window. At this point we have completed the installation of the 7-zip software. Isn’t it very simple?

How to use 7-Zip (7z decompression software)   

Preparation:

​​ 1. Let’s first make some simple settings on 7-zip to facilitate future use. We can click the "Start" menu, find the 7-zip folder we just installed, click to open it, and see two options: 7-Zip File Manager (File Management) and 7-Zip Help (Help Manual). Select 7-Zip File Manager to open, and then set up the 7-zip software, as shown in the figure below:

​​ 2. Then we click the tool menu to open "Options". After opening, we first set the language of the software, click the "Language" option, select "Chinese Simplified (Simplified Chinese)" in the language and set it to the Chinese language. This can prevent garbled characters from being decompressed using 7-zip in the future.

​​ 3. Then click the "7-Zip" option and check "Add 7-Zip to the right-click menu" so that we can use the 7-Zip tool when we right-click the menu.

How does 7-Zip compress files?

​ ​ 1. For example, there is a folder named imgs on my desktop that I want to edit.Compression, here we can click on the folder to select 7-Zip - "Add to compressed package". After clicking, we will enter the add to compressed package interface.

​​ 2. When the "Add to compressed package" panel is opened (as shown in the figure below), here we can select the path for the compressed package (the directory where the compressed package is stored), and also set the compression format, compression level, compression method, dictionary size, word size, solid data size, number of CPU threads, update method, path mode, encryption or not, etc. It can also count the memory required for compression, the memory size required for decompression, etc. Everyone can choose the corresponding settings according to their own needs.

​​Compression formats: 7z, tar, wim, zip.

​​​Compression levels: storage only, standard compression, ultra-fast compression, fast compression, maximum compression, extreme compression. In the compression level, there are several compression options. Generally, for simple and small files, you can choose the standard compression mode; if the file you want to compress is relatively large, in order to compress the file to a smaller size, you usually choose "extreme compression".

Encryption: Powerful AES-256 encryption. When decompressing, you must fill in the password to successfully decompress the files inside. This is very important for some more important data files.

Dictionary size: 16MB24MB64KB1MB.... There are multiple options here. What I want to explain here is that if the memory allows, the bigger the better. [7-ZIP 4.60 standard compression 64M dictionary requires 674M memory, 32M dictionary 370M memory].

​​ 3. After setting up in the "Add to Compressed Package" panel, we can click "OK" and then we can see the compression progress meter. Here we can see that 7-Zip will calculate the time, size, speed and other information for the compressed file in real time. The editor recommends that you do not perform other operations if the compressed file is relatively large, and please wait patiently for compression. After the compression is completed, a compressed package will be created in the current directory. If other compression software is installed on your computer, the icon may be displayed differently. This does not matter, just use it normally.

How to decompress software 7-Zip?

The decompression software is very simple. We only need to find the software package we want to decompress, right-click and select "7-zip" - "Extract to ***" (the name of the compressed file is displayed here), so that the file can be decompressed in the same directory as the current compressed package.

You can also choose "Extract file..." to customize the location of the decompressed file. You can click the three-dot button (browse button) behind the path and browse to select the path.

Which decompression software is better, 7-Zip or WinRAR?

Simply put, 7-Zip and WinRAR are both good compression and decompression software. 7-Zip is open source and free, and the genuine version of WinRAR requires payment. The interfaces of the two are different, but the basic functions are similar. Which one is better depends on personal habits.

Generally speaking, 7-Zip is a compression software with better overall performance. It not only has fast compression speed but also has a higher compression rate than RAR. It supports more decompression formats and can generate compressed packages, and it can also encrypt and store files to increase security, which is really great. Files compressed into 7z format using 7-zip will be much smaller than rar format files, and other formats will have similar sizes after compression. The only shortcoming is that it cannot generate RAR compressed packages, but it can be opened. If you do not have too many requirements for this, then there is no problem in choosing 7-Zip.

      WinRAR download link: http://softwaredownload4.com/soft/5.htm

7-Zip (7z decompression software) update log

      1. Fix errors in 7-Zip versions 24.00 to 24.07:

      Fixed an issue when creating zip archives where 7-Zip could write extra zero bytes at the end of the archive if it could not compress the file below its original size.

      Apart from these useless zero bytes, the created zip archive itself is normal. When unpacking such a zip archive, 7-Zip displays a warning:

      "Warning: The archive contains extra data at the end"

      2. Fixed a bug: GDI objects (internal resources in Windows) leaked in the "Confirm File Replacement" window.

      This causes problems after the same 7-Zip process displays the "Confirm File Replacement" window 1600 times in a row.

      3. Some optimizations have been made to the file icons displayed in the 7-Zip file manager and the "Confirm File Replacement" window.

      4. Fixed known errors.