ZIP to 7Z

Convert ZIP archives to 7Z format online for free. Get better compression and smaller file sizes from your existing ZIP archives.

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File is too large. The limit is 100 MB.

Supported: .zip (Max 100 MB)

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info About this tool
Convert ZIP archives to the more efficient 7Z format. ZIP is universal and convenient, but its DEFLATE compression algorithm dates from the early 1990s. 7Z uses the modern LZMA2 algorithm, which typically compresses files 20 to 50 percent smaller than ZIP at comparable speed. If you are distributing large archives and want to reduce download sizes, converting to 7Z is a straightforward way to achieve significantly better compression.

File size: 7Z output is typically 20 to 50 percent smaller than the source ZIP archive.

Quality: Files are extracted and repackaged with LZMA2 compression. Contents are not modified.

format_list_numbered How to convert
  • 1
    Upload your ZIP archive.
  • 2
    The converter extracts all contents and repacks them using 7Z's LZMA2 compression.
  • 3
    Download a 7Z archive that is typically 20 to 50 percent smaller than the original ZIP.
help FAQ

How much smaller will the 7Z be?

Typically 20 to 50 percent smaller than ZIP for most file types. Already-compressed files (videos, JPGs, existing ZIP/RAR) show less improvement.

Can everyone open 7Z?

7Z requires 7-Zip or compatible software. It is not natively supported by Windows Explorer or macOS Finder. For broad compatibility, ZIP remains the better choice.
lightbulb Common use cases
  • check_circle Reducing the size of a ZIP archive before uploading it online
  • check_circle Converting large ZIP distributions to 7Z for file hosting
  • check_circle Getting better compression for software release archives
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