Why are 7Z files smaller than ZIP?

7Z uses the LZMA/LZMA2 algorithms, which typically achieve a higher compression ratio than ZIP's Deflate. The trade-off is that compressing takes more time and memory.

Are my 7Z files uploaded?

No. The archive stays on your device and is read locally in the browser. Only the public sample archive is requested from the server.

Can it open encrypted 7Z archives?

Password-protected 7Z files cannot be listed without the password. The viewer handles standard unencrypted 7Z archives.

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7Z Viewer

Free online 7Z viewer. Open .7z archives in your browser to list and inspect contents — no upload, no extraction.

.7z

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About this file format

7Z (.7z) is the native archive format of the open-source 7-Zip software, introduced in 1999. It uses LZMA or LZMA2 compression, which delivers some of the best compression ratios of any mainstream format, and supports optional AES-256 encryption. 7Z is popular for large software downloads and backups where size matters.

7Z Viewer

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