Understanding 7-Zip & LZMA2
What is a 7z file?
The 7z format is an open-architecture archive format that features a high compression ratio. It uses AES-256 encryption and can handle files up to 16,000,000,000 GB. ZipZip brings the full power of the 7-Zip library to your browser using WebAssembly (WASM).
The Power of LZMA2
LZMA2 is the primary compression algorithm for 7z files. It is highly efficient but requires significant CPU power to decompress. Our tool utilizes multi-threaded local processing to ensure fast extraction without sending data to cloud servers.
7z Technical Capabilities
- ✔ Support for Split Archives (.001, .002)
- ✔ AES-256 encryption with header masking
- ✔ Unicode filename support
- ✔ Solid compression extraction
How to extract 7z files on Mac or Mobile
Many operating systems, including macOS, iOS, and Android, do not support 7z files natively. Instead of searching for "7z unarchiver" in the App Store and risking your privacy with unknown apps, you can use ZipZip. Decryption and extraction happen in your browser's RAM.
This means your private documents, work backups, or photos never touch our disks. For split archives, just select all parts simultaneously, and our WASM engine will reconstruct the original files locally.
7z Extraction FAQ
Is 7z better than ZIP? ▼
Generally, yes. 7z files are often 30-70% smaller than ZIP files due to the superior LZMA/LZMA2 compression algorithms.
How do I open .7z.001 files? ▼
These are split volumes. Select all files (.001, .002, etc.) at the same time in our uploader to extract the full content.
Is it safe to enter my password? ▼
Yes. The password prompt is handled by the local WebAssembly module. We have no way to see or store your credentials.