Open a .7z

7z is the format the 7-Zip project came up with, and it's pretty good — it usually compresses smaller than both zip and rar. ROM dumps, big datasets, open-source release archives lean on it. Drop one below and we'll read it.

drop your .7z here

or click to browse. Encrypted ones too — type the password below first.

Password (if encrypted)

01.About 7z

7z is the format that ships with the 7-Zip project. It uses LZMA / LZMA2 under the hood, which packs tighter than the DEFLATE algorithm in zip and usually beats rar too. The catch has always been that not every machine can open one out of the box. Windows finally added built-in support in late 2023; macOS still hasn't.

What this page handles

LZMA and LZMA2, which is what you'll see in almost every .7z.
AES-256 on the file data. Type the password and go.
Header-encrypted archives, where even the file list is locked. You'll get a "password required to list contents" message until you supply it.
Solid archives — files share a compression dictionary. We decompress on demand, so you can preview one file without unpacking the whole thing.
The BCJ / BCJ2 / Delta filters that 7-Zip uses to squeeze x86, ARM, and multimedia content.

Privacy

The file and the password both stay in your tab. Nothing leaves.