7-Zip
An open-source archive utility for creating and extracting 7z, ZIP, TAR, XZ and other common formats, with Windows shell integration and command-line support.
What 7-Zip can do
7-Zip creates and extracts 7z, XZ, BZIP2, GZIP, TAR, ZIP and WIM archives. It can also extract many additional formats such as RAR, ISO, DMG, VHD and VMDK. The Windows build includes a file manager, shell integration and command-line tools; LZMA and LZMA2 provide the main 7z compression methods.
Encryption and recovery boundaries
7z and ZIP support AES-256 encryption. The real protection still depends on a long unique password, whether file names are encrypted, and how the password and archive are stored. A forgotten archive password normally has no recovery path, so keep an independent recovery plan and checksum with important archives.
Safe handling of unfamiliar archives
An archive can contain executables, scripts, shortcuts, misleading extensions or paths that overwrite existing files. Inspect its file list first, extract it into a new isolated directory, and scan the result before opening anything. Check the declared size and available disk space because a compressed archive can expand far beyond its download size.
Maintenance note
This page reviews the 7-Zip 26.02 format list, LZMA/LZMA2 behavior, AES-256 options, Windows integration and license notes. Content review date: 2026-08-06.
Save to your cloud drive
Open the cloud drive to get the file directly, or save it for convenient access on another device.
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7-Zip installation, encryption and safe extraction guide
Start with a disposable test directory. Create, test and extract a normal archive before trying encryption, and never unpack an unfamiliar archive directly into a desktop or system directory.
Before you start
- Prepare a test directory containing non-sensitive sample files and keep an independent checksum for the originals.
- Choose 7z for long-term storage or ZIP for wider compatibility; prepare a long unique password when encryption is needed.
- Use a standard user account and an isolated destination for archives from outside your own computer.
Installation steps
- 01
Choose the matching package
Select the package that matches the operating system and CPU architecture, then verify the file name and version before launching it.
- 02
Check the file manager integration
Open the 7-Zip file manager and its context-menu entries with a test file. Confirm that the command points to the intended installation directory.
- 03
Create a test archive
Create a normal 7z archive, run the archive test command, and extract it into a new directory. Compare file counts, sizes and checksums.
Quick start
- 01
Select a format and level
Use 7z when compression and features matter, or ZIP when recipients need broad compatibility. Higher compression can use more time and memory.
- 02
Create an encrypted copy
Use AES-256 with a long password and enable file-name encryption when the directory structure is sensitive. Never put the password in the archive name or a note beside it.
- 03
Verify recovery
Close the archive window, reopen it from another directory, run a test and extract the complete copy. Confirm the password, Unicode names and recipient compatibility.
Usage tips
- Encryption is not a backup. Keep independent copies and checksums for important archives.
- Solid compression can improve the ratio for similar files, but local damage may affect more entries; keep multiple copies for critical data.
- Self-extracting archives are executable files and deserve stricter source verification than ordinary archives.
Troubleshooting and uninstall
What should I do when the archive test fails?
Make a copy of the original archive, then verify its checksum, all volumes and the password. Do not repeatedly extract over the same destination.
Why can another person not open the encrypted archive?
Check support for the selected format, AES method and file-name encryption. Test a small sample with the recipient's tool instead of weakening the password.
- Preserve important archivesBefore uninstalling, confirm that another supported tool can read important archives and that passwords and checksums are stored safely.
- Remove the applicationUninstall 7-Zip through the operating system's application settings. Archive files are not removed with the program.
Frequently asked questions
Which formats can 7-Zip create and extract?
It can create or extract 7z, XZ, BZIP2, GZIP, TAR, ZIP and WIM, and can extract many additional formats. Being able to extract a format does not mean 7-Zip can create that format.
Is an AES-256 archive automatically safe?
No. Password strength, file-name encryption, device security and independent backups all matter. A lost password usually cannot be recovered.
How should I open an unfamiliar archive?
Inspect the file list, extract into a new isolated directory, scan the result and check the expected expanded size before opening executable files or scripts.