How this tool works
SSL/TLS tools parse certificate, CSR, key, or live handshake data with OpenSSL-compatible logic. They surface subject, issuer, SAN, validity, chain, format, and key-matching details so deployment issues are easier to isolate.
SSL / TLS
CSR Decoder
Paste a CSR PEM to inspect subject, SANs, public key, and signature algorithm.
Privacy note
Sensitive input is processed only for the current request and is not stored by this tool.
Privacy
The CSR is processed only for this request. After submit, the CSR content is not placed back into the form.
What is CSR Decoder for?
Decodes a CSR to verify subject, SANs, public key, and signature algorithm before sending it to a CA. The output is organized for quick review, copying, and cross-checking with nearby tools in the SSL / TLS group.
Part of this tool group
Open nearby tools in the same group to cross-check, inspect deeper, or complete a small workflow.
Open SSL / TLS hubFrequently asked questions
When should I use CSR Decoder?
Decodes a CSR to verify subject, SANs, public key, and signature algorithm before sending it to a CA. Use it when you need a quick, readable result before cross-checking with production data or related tools in the SSL / TLS group.
Should I verify the result before applying changes?
Yes. Treat the output as an operational aid: review the source input, compare it with authoritative systems, and test changes in the correct environment before rollout.
