Decode SSL Certificates

Decode and verify that your new SSL Certificates have been issued correctly with all your required values. Paste your Certificate PEM file contents into the field below, and our decoder will decode your Certificate and display all its information.

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Frequently asked questions

: An SSL/TLS Certificate mainly contains the following information. It may include additional fields, but these are the most common.
Domain Name: Specific domain the certificate is issued for.
Subject: Identity of the certificate owner (organisation name and location).
Issuer: Information about the Certificate Authority (CA).
Public Key: Public key is used for encrypting data sent to the website.
Serial Number: Unique number assigned by the CA.
Validity Period: Timeframe during which the certificate is valid.
Signature Algorithm: Algorithm used by the CA to sign the certificate.
Signature: Digital signature of the issuing CA.
Subject Alternative Name (SAN): Optional field for multiple domain names or subdomains.
: An SSL certificate file, when viewed as plain text, is encoded in a format known as PEM (Privacy-Enhanced Mail), which is a Base64 encoded DER certificate enclosed between "-----BEGIN CERTIFICATE-----" and "-----END CERTIFICATE-----" lines. Here's an example to:
-----BEGIN CERTIFICATE----- MIIH4DCCBkigAwIBAgIQA7aNVXx/DVilNYtsJnpYnzANBgkqhkiG9w0BAQsFADBG MQswCQYDVQQGEwJBVTEQMA4GA1UEChMHVmVyb2tleTElMCMGA1UEAxMcVmVyb2tl eSBWZXJpZmllZCBCdXNpbmVzcyBHMjAeFw0yMzA1MTEwMDAwMDBaFw0yNDA1MTEy MzU5NTlaMGgxCzAJBgNVBAYTAkFVMRgwFgYDVQQIEw9OZXcgU291dGggV2FsZXMx DzANBgNVBAcTBkdvcmRvbjEQMA4GA1UEChMHVmVyb2tleTEcMBoGA1UEAxMTd3d3 LnNzbHRydXN0LmNvbS5hdTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEB pW/Kw4mTshKwoIDog7p8KEE4hB/N0/lp/ir3HZAZV4znByapB26U/ee+cFR8fGix cKGcgfGlMEHVy6DGWQ//FlJK8wh1ahFCQ/e759DJERNfwQwdtHHzrRZlnNVVBiaY WJ6RKF+fbVuGwBppqyhQHdYPDDGtZ/sXcQcA9j4RVfUqCKS1j0SJ2crLbCibQLzK 3YpuEdTRBYIopwB1mBQlLfs1qUX7tfPG77iilZ5Vdqbk8RxcuzIf6qJQeCYukx+7 7AEdeqZn9xI+GFNklCerzIACs2Op5XmB0HPUZ13+OWy/1bQee3kQlDhZT97DIbzr lWXiXw== -----END CERTIFICATE-----