Convert ZIP to 7-Zip Online Free
Convert ZIP archives to 7-Zip format while preserving all files and directory structure. Powered by 7-Zip.
ChangeThisFile converts your ZIP archive to the 7-Zip format using 7-Zip on our secure servers. The 7z format typically compresses 30-70% smaller than ZIP using LZMA2 compression. Your file is encrypted during upload and auto-deleted after processing, completely free with no signup required.
Convert ZIP to 7-Zip
Drop your ZIP file here to convert it instantly
Drag & drop your .zip file here, or click to browse
Convert to 7-Zip instantly
ZIP vs 7-Zip: Format Comparison
Key differences between the two formats
| Feature | ZIP | 7-Zip |
|---|---|---|
| Algorithm | DEFLATE | LZMA/LZMA2 |
| Compression | Lossless (moderate ratio) | Lossless (best ratio) |
| Encryption | AES-256 or ZipCrypto | AES-256 |
| Multi-file | Yes (directory structure) | Yes |
| Streaming | Limited | No |
| Compatibility | Universal (built into all OS) | 7-Zip, WinRAR, most archivers |
When to Convert
Common scenarios where this conversion is useful
Maximum compression
Convert ZIP to 7z to achieve the best compression ratio, saving significant storage space on large archives.
Large file archival
7z's LZMA2 algorithm excels at compressing large datasets, source code, and database dumps.
Secure archives
7z supports AES-256 encryption for protecting sensitive files in transit or storage.
Split large archives
Create multi-volume 7z archives to split large backups across multiple storage media.
How to Convert ZIP to 7-Zip
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1
Upload your ZIP file
Drag and drop your .zip file onto the converter, or click to browse. Files up to 50 MB are supported for free.
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2
Server-side conversion
Your file is securely uploaded and converted on our servers using 7-Zip, the open-source archive manager. This typically takes a few seconds.
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3
Download the result
Once conversion is complete, click Download to save your .7z file. The uploaded file is automatically deleted from our servers.
Frequently Asked Questions
Yes, completely free. Convert ZIP to 7-Zip with no cost, no signup, and no watermarks.
No. Files are automatically deleted immediately after conversion. Nothing is stored or retained.
Yes. Files are transferred over encrypted HTTPS connections. Your data is protected in transit.
The conversion uses 7-Zip, the open-source archive manager on our servers, ensuring reliable and high-quality output.
Yes. All files and directory structure from the ZIP archive are preserved in the 7-Zip output.
Password-protected archives must be unencrypted before conversion. Upload unprotected archives only.
File permissions are preserved when both archive formats support them. ZIP has limited Unix permission support compared to TAR-based formats.
7-Zip uses LZMA/LZMA2 which may result in a different archive size compared to ZIP (DEFLATE).
Only single-file archives are supported. Combine split archives before uploading.
There is no limit on the number of files within the archive, but the total archive size must be under 50 MB.
Currently, archives are converted one at a time. Upload your next file after downloading the result.
Archives up to 50 MB are supported for free conversion.
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