ASN.1 Encoder Decoder
Convert ASN.1 DER between PEM, Base64, and hex in your browser with PEM normalization.
ASN.1 DER conversions in the browser
Convert Distinguished Encoding Rules (DER) payloads between PEM wrappers, raw Base64, and hex byte strings. Useful when inspecting certificates, CSRs, and other PKIX structures without sending material to a server.
Related tools: Base64 Decode, Text to Hex Converter, and PGP Key Viewer.
Frequently Asked Questions
What is ASN.1 DER?
DER is a binary encoding for ASN.1 data. PEM files wrap the same bytes in Base64 with BEGIN/END headers for easy sharing in text files.
Does this validate certificate fields?
The tool checks that bytes parse as ASN.1 DER. It does not verify trust chains, expiration, or hostname matching.
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