Overview
ZIP has been the standard for file compression since 1989. 7Z is a newer open-source format that beats ZIP in compression. RAR is the format used by WinRAR.
This guide compares all three to help you choose the right format for backups, sharing, and archiving.
Head-to-Head Comparison
Compression Ratio
ZIP: ZIP offers moderate compression. A 100MB folder typically compresses to 60-70MB.
7Z: 7Z achieves 20-40% smaller output files than ZIP using LZMA2 compression.
Winner: 7Z
Compatibility
ZIP: ZIP is natively supported on Windows, macOS, and Linux without extra software.
7Z: 7Z requires 7-Zip software or compatible archiver.
Winner: ZIP
Encryption
ZIP: ZIP supports AES-256 but the file list remains visible when encrypted.
7Z: 7Z supports AES-256 that also encrypts the file list - more secure than ZIP.
Winner: 7Z
Compression Speed
ZIP: ZIP compresses and decompresses very quickly.
7Z: 7Z compression is slower than ZIP at high compression levels. Decompression is fast.
Winner: ZIP
Open Source
ZIP: ZIP is an open standard. Free tools available on all platforms.
7Z: 7Z and 7-Zip are fully open source and free.
Winner: Both free
Convert Between ZIP, 7Z, and RAR
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Convert Archives FreeFrequently Asked Questions
Is 7Z better than ZIP?
7Z achieves 20-40% better compression than ZIP. However ZIP is universally supported without extra software.
Can I open 7Z on Windows without 7-Zip?
Windows 11 24H2 natively supports 7Z extraction. Older Windows versions require 7-Zip (free).
Is ZIP or 7Z faster?
ZIP is faster to compress and decompress. 7Z compression is slower but decompression speed is comparable.
Which format is best for backups?
7Z is generally better for backups due to superior compression and strong AES-256 encryption.
Is RAR better than 7Z?
RAR and 7Z have similar compression ratios. 7Z is open source and free. RAR requires WinRAR which has a paid license.