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How to Convert ZIP to 7Z
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When Do You Need to Convert ZIP to 7Z?
Converting ZIP to 7Z is about size. The 7z format compresses noticeably harder than ZIP, which matters when an archive has to be uploaded, emailed within a size limit, or stored where space costs money.
What Happens When You Convert ZIP to 7Z
The archive is unpacked and repacked as 7z. Compression is applied fresh to the contents rather than being translated, which is why the result is usually smaller: 7z uses a more effective algorithm and a much larger dictionary. Files inside are not modified, so the extracted contents are identical either way. The trade is compatibility, because Windows and macOS open ZIP without any extra software and neither opens 7z without a tool such as 7-Zip or Keka.
Worth knowing before you convert
Repacking a large archive takes time and memory, since 7z's stronger compression is more demanding than ZIP's.
About ZIP and 7Z
application/zip
ZIP is the most common archive format used to bundle and compress multiple files into a single container. It uses lossless compression and is natively supported by all major operating systems. ZIP files are widely used for file distribution, backups, and downloads.
application/x-7z-compressed
7Z is an open-source archive format using the LZMA and LZMA2 compression algorithms. It often achieves significantly smaller file sizes than ZIP or RAR. 7Z supports encryption, large files, and solid compression, making it popular for backups and software distribution.
Conversion Notes
Archive conversion re-compresses the contained files using the target format's algorithm. ZIP and 7Z may use different compression methods — lossless in both cases for general archives — so the output file size will differ. Encrypted archives require the original password to extract before re-packaging. File timestamps and directory structure are preserved.
Frequently Asked Questions
It varies with the content. Text, source code and documents often shrink by a further 20 to 40 percent. Files that are already compressed, such as photos and video, barely change.