What is a .xip file?
If you have downloaded Xcode from Apple's developer website, you got a .xip file instead of a .zip or .dmg. It is less common, but simple to understand.
What is it?
A .xip file is a signed archive made by Apple. Think of it as a .zip file with a digital signature stuck on. The signature lets macOS check that the file truly came from Apple and that nobody has tampered with it.
Apple uses .xip to hand out Xcode and other developer tools outside the App Store.
How to open it
Double-click the .xip file in Finder. macOS checks the signature first, then unpacks the contents. This check can take a while for large files like Xcode.
You can also unpack it from Terminal:
xip --expand Xcode.xip
Why not just use .zip or .dmg?
A normal .zip file has no built-in signing. Apple wanted a way to send out large files outside the App Store while still proving they are genuine. The .xip format does this. If someone changes the archive, the signature check fails and macOS will not unpack it.
Why does the check take so long?
macOS checks the signature against every file inside the archive. Xcode is several gigabytes and holds thousands of files, so this takes a few minutes. You cannot skip it.
Quick summary
| Question | Answer |
|---|---|
What is .xip? | A signed archive format by Apple |
| How to open? | Double-click in Finder or xip --expand in Terminal |
Why not .zip? | .xip includes a digital signature for checking |
| Why is it slow to open? | macOS checks every file in the archive |
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