.7z.021 — 7-Zip archive part file (part 21)
Igor Pavlov (7-Zip) · 2000
.7z.021 is a segment of a multi-part archive created by the 7-Zip compression utility.
Key Features
- Part of a multi-volume archive
- Utilizes 7-Zip's strong compression (LZMA/LZMA2)
- Requires all parts to extract
- Enables handling of very large archives
Best For
- Splitting very large archives into manageable parts.
- Achieving maximum compression for storage efficiency.
- Ensuring data integrity across multiple files.
- Distributing large files without relying on cloud storage.
Less Ideal For
- Quick, simple sharing of small files.
- Archiving documents that require frequent, minor edits.
- Email attachments where size is strictly limited.
- Formats requiring broad native compatibility without extra software.
Common Use Cases
- Distributing large software installers or datasets.
- Archiving extensive media collections or backups.
- Transferring large files over networks with size limitations.
- Storing historical data that needs to be kept intact.
How to Open It
- Install the 7-Zip application on your computer.
- Place all parts of the archive (.7z.001, .7z.002, ..., .7z.021, etc.) in the same folder.
- Right-click on the first part (e.g., the .7z.001 file) and select 'Extract Here' or 'Extract Files...'.
- The software will automatically find and use the subsequent parts to reconstruct the original archive.
What is a .7z.021 file?
This file extension represents a part of a larger archive created using the 7-Zip compression format. 7-Zip is known for its high compression ratios, especially with its native .7z format. When an archive is too large to be stored or transferred as a single file, it can be split into multiple smaller parts, each indicated by a sequential number in the filename, such as .001, .002, and so on. Therefore, .7z.021 is simply the 21st segment of a multi-volume 7-Zip archive.
Programs That Open .7z.021 Files
| Platform | Program | ||
|---|---|---|---|
| Windows | 7-Zip | Free | Official |
| PeaZip | Free | ||
| WinRAR | Paid | Official | |
| macOS | The Unarchiver | Free | |
| Keka | Free | ||
| Linux | p7zip | Free | |
| 7-Zip | Free | Official | |
| Android | RAR | Paid | Official |
| 7Zipper | Free | ||
| iOS | iZip | Free | |
| Documents by Readdle | Free | ||
| Web Browser | File Viewer Plus (online) | Free |
How to Convert .7z.021 Files
| Format | Method |
|---|---|
| .7Z | 7-Zip, PeaZip |
| .ZIP | 7-Zip, PeaZip |
Common Problems with .7z.021 Files
Frequently Asked Questions
It signifies that the file is the 21st part of a larger archive that has been split into multiple volumes using the 7-Zip format. All parts are necessary to reconstruct the original archive.
No, you cannot open a single split archive part directly. You need to have all parts and use an archiving tool like 7-Zip to extract the first part, which will then use the others.
Splitting archives is done to make them easier to manage, transfer, or store, especially when dealing with very large files that might exceed size limits for email, cloud storage, or file systems.
Technical Details
The .7z format utilizes the LZMA or LZMA2 compression algorithms, offering excellent compression ratios. When an archive is split, each part is typically of equal size (except possibly the last one), and they are all required to reconstruct the original archive. The file signature for 7-Zip archives typically starts with '7z'. The .021 extension indicates its sequential position within the split archive set.