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SSL Self-Signed Certificate Tool

Generate an X.509 v3 self-signed certificate entirely in your browser. Nothing you enter here — including your private key or password — is ever sent anywhere.

Subject (CSR) Information

Common Name (CN) *

Organization (O)

Organizational Unit (OU)

Locality / City (L)

State / Province (ST)

Country (C) 2-letter ISO country code

Email Address

Subject Alternative Names (SANs) Comma-separated DNS names and/or IP addresses

Cryptographic Options

Key Algorithm

Key Size / Curve

Signature Hash Algorithm

Validity Period (Years)

PKCS#12 (.p12) Export Password

Password to encrypt the .p12 file (AES-256)

Only required if you want a .p12 file. RSA keys only — see note below.

Note: PKCS#12 (.p12) export is not available for ECDSA certificates. No currently available browser-side JavaScript library reliably packages EC keys into the PKCS#12 format. Switch the Key Algorithm to RSA above if you need a .p12 file, or use the PEM export below for ECDSA.