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How to open .PEM files on Android

To open .PEM files on Android, open the .pem in a text-capable file viewer to inspect the BEGIN/END markers; for actual certificate/key operations, transfer it to a desktop/server environment and use OpenSSL.

Step-by-step instructions

  1. Open the .pem in a text-capable file viewer to inspect the BEGIN/END markers; for actual certificate/key operations, transfer it to a desktop/server environment and use OpenSSL.

Common issues

The file opens as plain text and doesn’t “install” like a certificate

PEM is an encoding/container; it can hold different objects (certificate, key, CSR, chain). Many systems expect specific certificate stores or different file formats for import, so double-clicking may just show text.

  1. Open the file and check the BEGIN/END label (e.g., CERTIFICATE vs PRIVATE KEY) to identify what it contains.
  2. Use OpenSSL to inspect/convert as needed; OpenSSL supports PEM as an input/output format.

Server configuration fails because the file is the wrong PEM type (certificate vs key vs chain)

TLS server configuration typically requires separate files or specific ordering (certificate and matching private key, plus intermediates). A .pem might contain only a leaf certificate, only a key, or a full chain.

  1. Verify which blocks are present by opening the .pem and reading the BEGIN/END lines.
  2. If configuring Apache httpd with mod_ssl, ensure you are providing the correct PEM-encoded X.509 certificate and the corresponding PEM-encoded key as required by your configuration.

Paste/email formatting breaks the PEM (invalid Base64 or missing boundaries)

PEM relies on exact encapsulation boundaries and valid Base64 content. Extra spaces, missing dashes, or truncated lines can make tools reject the file.

  1. Confirm the file contains intact “-----BEGIN …-----” and “-----END …-----” lines with no extra characters.
  2. Re-export or re-download the PEM from the original source if the file appears altered, then re-try with OpenSSL.

Certificate chain order is incorrect

When a .pem contains a certificate chain (multiple CERTIFICATE blocks), some software expects a particular ordering (typically leaf first, then intermediates). The IANA-registered media type application/pem-certificate-chain is specifically for certificate chains in PEM encoding.

  1. Check whether the .pem contains multiple CERTIFICATE blocks (a chain).
  2. If your TLS software rejects it, rebuild the chain file in the order expected by that software and re-test.

Security note

A .pem file may contain a private key (e.g., “BEGIN PRIVATE KEY” or similar); treat such files as secrets, restrict file permissions, and avoid sending them over insecure channels.

Back to .PEM extension page