ZIP → 7Z
Repacks ZIP into 7z (LZMA compression), typically shrinking size another 10–30% for long-term archiving and bandwidth-limited distribution.
Drag files here or click to upload (multiple files supported)
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How to convert ZIP to 7Z
- 1Upload your ZIP file by dragging, clicking, or pasting.
- 2Adjust quality settings if needed.
- 3Click 'Convert Now' and wait for the conversion to complete.
- 4Download your converted 7Z file.
About ZIP to 7Z conversion
ZIP was released by PKWARE in 1989, uses DEFLATE compression per file, and is a cross-platform general distribution archive format. Both Windows and macOS support native double-click extraction. 7Z was launched by 7-Zip in 1999, uses LZMA/LZMA2 compression, and users usually convert to get higher compression ratio to save storage space.
This conversion is completed based on the 7-Zip engine. The output 7Z file uses LZMA2 compression algorithm, and its compression ratio is usually 10% to 30% higher than the original ZIP file. The conversion process preserves the directory structure of the original files, but does not preserve original file permission information. The output 7Z requires 7-Zip to be installed to extract on Windows.
This conversion is suitable for workflows that require reducing archive volume for storage and distribution. The output 7Z does not support native extraction on Windows. You need to inform ordinary Windows users of the extraction method in advance when sending files, and some versions of macOS require third-party tools to extract the output file.
ZIP vs 7Z: technical comparison
| Feature | ZIP | 7Z |
|---|---|---|
| Released | 1989 | 1999 |
| Developer | PKWARE (Phil Katz) | Igor Pavlov |
FAQ about ZIP → 7Z
Does the compression ratio change after conversion
The compression ratio of the output 7Z is 10% to 30% higher than the original ZIP. This conversion uses the LZMA2 compression algorithm, and the output file size for the same content is smaller than the original ZIP file.
Is the original file directory structure preserved
The conversion process preserves the file directory structure inside the original archive, does not preserve original file permission information, and original file content will not be corrupted or lost.
What is the maximum single file size limit
The maximum single file upload limit for this service is 50MB. If the total uncompressed size exceeds 256MB or the number of files exceeds 1000, the service will reject processing the file.
Will uploaded files be retained
Files are uploaded to the server via HTTPS for conversion. After conversion completes, the server immediately deletes both the source file and output file, and retains no storage of any kind.