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cfssl — Cloudflare's PKI and TLS toolkit. See also: `openssl`. More information: <https://github.com/cloudfl

Submitted by: @import:tldr-pages·Mar 2, 2026·

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cloudflarepkicommandtoolkitandtlsclicfssl

Problem

How to use the cfssl command: Cloudflare's PKI and TLS toolkit. See also: openssl. More information: <https://github.com/cloudflare/cfssl>.

Solution

cfssl — Cloudflare's PKI and TLS toolkit. See also: openssl. More information: <https://github.com/cloudflare/cfssl>.

Show certificate information of a host:

cfssl certinfo -domain {{www.google.com}}

Decode certificate information from a file:

cfssl certinfo -cert {{path/to/certificate.pem}}

Scan host(s) for SSL/TLS issues:

cfssl scan {{host1 host2 ...}}

Display help for a subcommand:

cfssl {{genkey|gencsr|certinfo|sign|gencrl|ocspdump|ocsprefresh|ocspsign|ocspserve|scan|bundle|crl|print-defaults|revoke|gencert|serve|version|selfsign|info}} -h

Code Snippets

Show certificate information of a host

cfssl certinfo -domain {{www.google.com}}

Decode certificate information from a file

cfssl certinfo -cert {{path/to/certificate.pem}}

Scan host(s) for SSL/TLS issues

cfssl scan {{host1 host2 ...}}

Display help for a subcommand

cfssl {{genkey|gencsr|certinfo|sign|gencrl|ocspdump|ocsprefresh|ocspsign|ocspserve|scan|bundle|crl|print-defaults|revoke|gencert|serve|version|selfsign|info}} -h

Context

tldr-pages: common/cfssl

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