Convert PEM to DER

Related Security conversions

• Convert DER to PEM— Convert a binary DER certificate to base64-encoded PEM format
• Convert CER to PEM— Convert a .cer certificate (DER or PEM encoded) to a PEM file
• Convert CRT to PEM— Convert a .crt certificate (DER or PEM encoded) to a PEM file
• Convert JWT to JSON (decode)— Decode a JWT token and extract the header and payload as JSON — no verification, client-safe
• Convert X.509 certificate to JSON— Decode an X.509 certificate (PEM or DER) and extract fields as JSON
• Convert SSH public key to JSON— Parse an SSH public key and extract its type, fingerprint, and key info as JSON
• Convert CSR to JSON— Decode a PEM certificate signing request (CSR) and extract subject and metadata as JSON
• Convert P7B to PEM— Extract every certificate from a PKCS#7 bundle (.p7b / .p7c) as PEM, with subject and issuer
• Convert CRL to JSON— Decode a certificate revocation list: issuer, update dates and every revoked serial number with date and reason
• Convert JWK to PEM— Convert a public JSON Web Key or a JWKS (RSA, EC, Ed25519) to PEM public keys
• Convert PEM to JWK— Convert a PEM public key or certificate to a JSON Web Key with a SHA-256 key ID
• Convert nmap XML to JSON— Convert an nmap XML scan report (-oX) to JSON: hosts, hostnames, OS guesses and ports with services
• Convert nmap XML to CSV— Convert an nmap XML scan report (-oX) to a CSV with one row per host and port

About this conversion

Convert a PEM certificate or key to binary DER format. This converter processes your PEM (.pem / .crt / .cer / .key) file server-side and returns a DER file instantly — no account, no software installation, and no file storage. Files are deleted from our servers immediately after conversion.

Learn more: PEM / DER / CER / CRT file format explained

How to convert PEM (.pem / .crt / .cer / .key) to DER

1. 1. Upload — drag your PEM (.pem / .crt / .cer / .key) file onto the converter above, or click to browse.
2. 2. Convert — press Convert. Processing happens on secure servers in seconds.
3. 3. Download — your DER file downloads automatically. No sign-up required.

Convert PEM (.pem / .crt / .cer / .key) to DER from the command line

curl --fail-with-body \
  -H "Authorization: Bearer YOUR_TOKEN" \
  -F "file=@input.pem" \
  -F "conversionId=pem-to-der" \
  https://www.omniconvert.cloud/api/convert -o output.der

The API needs a token from a credit pack, and each API conversion uses one credit. Converting on this page stays free. API documentation