SSL Certificate Decoder - Check Issuer, Validity, Public Key & More

*.cer *.pem

Organization Name: {{chain.issuer.organizationName}}

Valid From: {{vm.toDisplayTime(chain.validFrom_time_t)}}

Valid To: {{vm.toDisplayTime(chain.validTo_time_t)}}

Issuer Information

Common Name: {{chain.issuer.commonName}}

Organization Name: {{chain.issuer.organizationName}}

Country Name: {{chain.issuer.countryName}}

Certificate Details

Authority Key Identifier: {{chain.extensions.authorityKeyIdentifier}}

Subject Common Name: {{chain.subject.commonName}}

Subject Organization Name: {{chain.subject.organizationName}}

Subject Country Name: {{chain.subject.countryName}}

Subject Key Identifier: {{chain.extensions.subjectKeyIdentifier}}

Serial Number: {{chain.serialNumber}}

Serial Number (HEX): {{chain.serialNumberHex}}

Signature Information

Signature Type SN: {{chain.signatureTypeSN}}

Signature Type LN: {{chain.signatureTypeLN}}

Signature Type NID: {{chain.signatureTypeNID}}

Additional Details

Certificate Transparency (CT):

{{chain.extensions.ct_precert_scts}}

Subject Alt Name:

{{chain.extensions.subjectAltName}}

What is an SSL Certificate? Why Decode an SSL Certificate?

SSL (Secure Sockets Layer) is an encryption protocol designed to secure internet communications, widely used in HTTPS websites to prevent data tampering and interception. SSL certificates are issued by trusted Certificate Authorities (CAs) and contain essential details such as website identity, public key, validity period, and signature algorithm.

Decoding an SSL certificate helps developers, webmasters, and security professionals verify its authenticity, check for expiration, detect possible forgery, or identify weak encryption algorithms. Our SSL certificate decoder supports multiple methods: manual input, file upload, remote certificate download, or direct HTTPS website query. It provides critical insights into the issuing CA, public key, Subject Alternative Names (SAN), and more, ensuring website security and compliance.

By using an SSL certificate checker, you can easily validate SSL certificates, ensure your website meets HTTPS security standards, build user trust, and improve SEO rankings for better search engine visibility.