What is the difference between PEM and DER?

DER is the binary encoding of the ASN.1 data structure. PEM is DER that has been Base64-encoded and wrapped in header/footer lines for text transport.

What types of PEM files does this support?

Any PEM-wrapped structure: certificates, private keys, public keys, CSRs, etc.

PEM to DER Converter

Convert a PEM certificate or key to binary DER format and download the .der file.

PEM Input

Strips the PEM header/footer and Base64-decodes the body to binary DER. The file is created in your browser and downloaded directly — nothing is uploaded.

Related Tools

#DER to PEM Converter

Upload a .der file and convert it to PEM format with the appropriate header and footer.

#SSL Certificate Decoder

Paste a PEM certificate and decode its subject, issuer, validity dates, SANs, and more.

#PEM Key Parser

Paste a PEM private or public key to detect its type, algorithm, and key size.

FAQ

What is the difference between PEM and DER?: DER is the binary encoding of the ASN.1 data structure. PEM is DER that has been Base64-encoded and wrapped in header/footer lines for text transport.
What types of PEM files does this support?: Any PEM-wrapped structure: certificates, private keys, public keys, CSRs, etc.

Strip the PEM header and footer lines, Base64-decode the body, and produce raw DER-encoded binary output. Download the result as a .der file. Works with certificates (BEGIN CERTIFICATE), private keys (BEGIN PRIVATE KEY), and other PEM-wrapped structures.