A Certificate Signing Request (CSR) is a block of encoded text submitted to a Certificate Authority (CA) to apply for an SSL/TLS certificate. It contains the public key and identifying information.

Is my CSR data private?

Yes. The CSR is parsed entirely in your browser. No data is sent to any server.

What format is accepted?

PEM format beginning with -----BEGIN CERTIFICATE REQUEST----- or -----BEGIN NEW CERTIFICATE REQUEST-----.

Does the CSR contain a private key?

No. A CSR contains only the public key and subject information. Your private key is never included in a CSR and should never be shared.

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CSR Decoder

Decode and inspect PKCS#10 Certificate Signing Requests in your browser.

PEM Certificate Signing Request

About this tool

Free online CSR decoder. Paste a PEM-encoded Certificate Signing Request to extract subject details (CN, O, OU, C, ST, L, email), public key algorithm, key size, signature algorithm, and Subject Alternative Names. Parsed entirely in your browser.

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