Signing an IPA file means adding a valid Apple Developer certificate and provisioning profile so iOS can verify and install the app on a specific iPhone or iPad. An IPA file by itself is not enough. If it is unsigned, expired, signed for another device, or signed with a revoked certificate, iOS will usually block the installation.
CertDrop's online IPA signer is useful when you already have the required signing files and want a signed IPA or direct install link without using a Mac.
What you need before signing an IPA
Before you start, prepare these files:
- The
.ipaapp file you want to sign. - A valid
.p12Apple Developer certificate. - The certificate password for the
.p12file. - A matching
.mobileprovisionprovisioning profile. - An iPhone or iPad whose UDID is included in that provisioning profile.
If one of these parts is wrong, signing may fail, or the app may sign but fail to install.
How online IPA signing works
An online IPA signer takes your IPA file, applies the certificate and provisioning profile, and rebuilds the app package. The signed IPA can then be installed on the registered device.
The process normally looks like this:
- Upload the IPA file.
- Upload the
.p12certificate. - Upload the
.mobileprovisionprofile. - Enter the certificate password.
- The signer checks the app, signs it, and creates a signed IPA.
- You install the signed IPA using an install link or compatible sideloading tool.
This does not jailbreak the iPhone. It only signs the app so iOS can trust it for the registered device.
Common IPA signing errors
Wrong certificate password
If the .p12 password is wrong, signing normally fails quickly. Check for extra spaces if you copied the password from an email or chat message.
Provisioning profile does not include the device
A standard Apple Developer certificate normally requires the target iPhone or iPad UDID to be registered. If the UDID is missing, the app may sign but not install.
Bundle ID mismatch
Some provisioning profiles are tied to a specific app identifier. If the IPA uses a different bundle ID, signing or installation may fail.
Certificate expired or revoked
If the certificate is expired or revoked, iOS may refuse to install or open the app. A new certificate and profile may be required.
App installs but does not open
This can happen when the IPA itself has compatibility issues, missing dependencies, unsupported entitlements, or server-side restrictions. Re-signing cannot fix every app.
CertDrop signer vs on-device signers
There are different ways to sign IPA files:
- CertDrop online signer: useful when you want to upload files and receive a signed IPA or install link.
- Feather, ESign, or Scarlet: useful when you want to manage signing directly on the device.
- Xcode or Apple Configurator: useful for more manual workflows on a Mac.
Frequently asked questions
Can I sign an IPA file without a certificate?
No. An IPA needs a valid signing identity and provisioning profile before iOS will install it on a normal device.
Is an IPA signer the same as an Apple Developer certificate?
No. The certificate is the signing credential. The IPA signer is the tool that uses the certificate and provisioning profile to sign the app.
Does signing remove app restrictions?
No. Signing only makes iOS accept the app package. It does not remove server-side login checks, app passwords, subscriptions, or restrictions built into the app.
IPA signer FAQ
What is an IPA signer?
An IPA signer uses an Apple Developer certificate, a .p12 file, a .mobileprovision profile, and the certificate password to sign an IPA so it can install on a registered iPhone or iPad.
Can I sign an IPA with a certificate online?
Yes. CertDrop's free online IPA signer can sign an IPA when you already have the IPA file, .p12 certificate, mobileprovision profile, and password.
Why does a signed IPA still fail to install?
The most common causes are a missing UDID in the provisioning profile, a wrong .p12 password, a revoked or expired certificate, or an IPA that is not compatible with your iOS version.
What certificate files do I need?
You need the certificate package: the .p12 certificate, the mobileprovision profile, and the password. If you need the full package, see the IPA signer certificate.