Open-The-File.com

Find how to open any file type

How to open .P8 files on iOS

To open .P8 files on iOS, iOS is not a typical environment for handling private-key files directly; avoid opening/importing .p8 keys on a mobile device and instead transfer the file securely to the server or desktop environment that will use it (for example for APNs token signing).

Step-by-step instructions

  1. iOS is not a typical environment for handling private-key files directly; avoid opening/importing .p8 keys on a mobile device and instead transfer the file securely to the server or desktop environment that will use it (for example for APNs token signing).

Common issues

The .p8 file opens as unreadable characters

Many PKCS #8 keys are stored as DER (binary) rather than PEM text, so a text editor shows garbage even though the file is valid.

  1. Check whether it contains PEM headers/footers; if not, assume it may be DER.
  2. Use OpenSSL’s PKCS#8 tooling (openssl-pkcs8) to read/convert between DER and PEM as needed.

OpenSSL reports it cannot read the key / wrong format

The file may be encrypted (EncryptedPrivateKeyInfo), may be in a different key container than you expect, or may be truncated/corrupted.

  1. Verify whether it is encrypted PKCS#8; if it is, you must provide the correct passphrase when reading/converting it.
  2. Re-download or re-export the key from the original source if the file may be incomplete or modified.

A service (for example APNs) rejects the .p8 key

Even if the file is a valid PKCS #8 key, the service may require a specific key that matches your account/project configuration, or your implementation may be using the wrong key.

  1. Confirm you are using the correct .p8 signing key issued for that service/workflow (for APNs, follow Apple’s token-based connection instructions).
  2. If you converted the key, ensure the conversion kept the correct key material and that your code/tool is loading the intended key file.

Security note

.p8 files typically contain private keys; treat them like passwords: do not email them, commit them to source control, or share them in tickets/chat logs.

Back to .P8 extension page