What is an IPA file and how to install one on iPhone without a computer
IPA files are iOS app packages. Learn where they come from, why they need signing, and how to install an IPA on iPhone or iPad without a PC using a certificate.
An .ipa file is to iOS what an .apk is to Android: a zip archive containing the app binary, its assets and an Info.plist. The App Store delivers IPAs behind the scenes; sideloading is simply installing an IPA yourself.
Why an IPA won't just install
Every IPA must carry a valid signature for your device. An IPA you download from the internet is either unsigned or signed for someone else's device, so iOS refuses it. Re-signing it with an iOS signing certificate generated for your UDID fixes that.
Installing an IPA on-device (no computer)
- Get a certificate for your device — Get a certificate.
- From your lemoncert account, install Feather or KSign with one tap. The app arrives with your certificate already loaded.
- Download the IPA in Safari, then share it to the signer app (or import from Files).
- Tap Sign → Install. The signed app appears on your Home Screen in a few seconds.
Installing with a computer
Sideloadly (Windows/macOS) can sign an IPA with your .p12 and push it over USB. Useful for very large IPAs or when Safari downloads are blocked.
Frequently asked
Can I install an IPA with a free Apple ID?
Yes, via AltStore/SideStore, but apps expire every 7 days and you are limited to 3 at a time. A paid certificate removes both limits.
Does re-signing change the app?
Only the signature and (sometimes) the bundle identifier. The app's code and data are untouched.