7Z to ZIP Converter
Drop a .7z, get a .zip every OS opens natively. No 7-Zip, Keka, or The Unarchiver required, and your files never leave your browser.
Drop your 7Z file here
Converts to .zip — stays on your device
Why convert 7Z to ZIP?
- Opening a 7Z download on macOS where Finder doesn't read 7Z — convert to ZIP and double-click.
- Sharing a deliverable with a Windows user who doesn't have 7-Zip installed.
- Uploading to a web service (Google Drive preview, Slack attachments, GitHub release assets) that handles ZIP but ignores 7Z.
- Repackaging a software bundle, dataset, or game asset pack that ships as 7Z into the ZIP form most installers and tooling expect.
- Converting on a Chromebook, iPad, or tightly-managed corporate laptop where 7-Zip can't be installed.
- Handing a contractor a file in the format their machine actually opens.
How our converter works
Your 7Z is decompressed by libarchive (the same library tar, bsdtar, and ArchiveBox use), running as WebAssembly in a Web Worker on this page. The LZMA / LZMA2 streams 7Z uses are decoded entry-by-entry, then fflate re-packs everything into a standard ZIP using DEFLATE compression. Nothing is uploaded — both libraries run in your browser.
Frequently asked questions
Will the ZIP be larger than the 7Z?
Usually yes — often noticeably. 7Z with LZMA2 typically compresses 20-50% smaller than the same content as ZIP. The trade-off you're making is universal compatibility for compression efficiency. If size matters more than openness, keep the 7Z.
Will password-protected 7Z archives work?
Not currently — the tool extracts using the no-password path. If your archive is encrypted, decrypt it in 7-Zip or Keka first, then convert the unencrypted version.
Will solid (non-streamed) archives work?
Yes. libarchive handles solid 7Z archives where multiple files share a single compression stream — extraction is slightly slower because the whole stream has to be decoded to get a single file, but the result is the same.
How big a 7Z can I convert?
Up to a few hundred MB on desktop browsers, less on mobile. Limits come from RAM available to the WebAssembly instance. For multi-gigabyte archives, a desktop 7-Zip / Keka extraction is faster and more reliable.
Are my files uploaded?
No. libarchive (decompress) and fflate (re-zip) both run as WebAssembly/JavaScript on this page. Sensitive archives — proprietary code, NDA bundles, customer data — never leave your device.
About the 7Z format
7Z is the native format of 7-Zip, Igor Pavlov's open-source compression tool first released in 1999. It uses LZMA / LZMA2 compression, which compresses harder than ZIP's DEFLATE — typically 20-50% smaller files for the same content. The format also supports strong AES-256 encryption and solid archives (where multiple files share one compression stream for better ratios). The downside is universality: macOS, Windows, Linux, and mobile platforms all unpack ZIP natively, but 7Z requires installing 7-Zip, Keka, The Unarchiver, or a similar tool. Converting 7Z→ZIP is the standard step when you need to hand someone an archive they can open with no extra software — locked-down corporate machines, Chromebooks, iPads, and any environment where third-party utilities aren't an option.