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

Upload your PEM (.pem / .crt / .cer / .key) file on this page, click Convert, and download your DER file instantly. No sign-up required.

Is converting PEM (.pem / .crt / .cer / .key) to DER free?

Yes. Every visitor gets 2 free conversions with no account required. Additional conversions are available via credit packs starting at $2.

Is OmniConvert safe to use?

Yes. Uploaded files are processed in server memory and deleted immediately after conversion. We do not store, log, or share your files.

Does OmniConvert store my files?

No. Files are never written to disk and are discarded as soon as the conversion is complete.

Do I need to install software to convert files?

No. OmniConvert runs entirely in the browser and on our servers. You do not need to install any software, plugins, or extensions to convert PEM (.pem / .crt / .cer / .key) to DER.

OmniConvert

PEM → DER

Related Security conversions

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X.509 certificate → JSON— Decode an X.509 certificate (PEM or DER) and extract fields as JSON
SSH public key → JSON— Parse an SSH public key and extract its type, fingerprint, and key info as JSON
CSR → JSON— Decode a PEM certificate signing request (CSR) and extract subject and metadata as JSON

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.

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

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

Frequently Asked Questions

How do I convert PEM (.pem / .crt / .cer / .key) to DER?: Upload your PEM (.pem / .crt / .cer / .key) file above, click Convert, and download the DER result instantly. No account or software needed.
Is converting PEM (.pem / .crt / .cer / .key) to DER free?: Everyone gets 2 free conversions with no account required. Additional conversions are available via credit packs starting at $2 — credits never expire.
Are my files stored or shared?: No. Files are processed in server memory and deleted immediately after conversion. Nothing is written to disk or retained.
Do I need to install anything?: No software installation needed. OmniConvert runs in the browser — just upload, convert, and download.

No account needed · Credits never expire · Share your token link across devices