X.509 Certificate Decoder

Click here or drag and drop a certificate file (.pem, .crt, .cer, .der)

Sample Certificate Chain for Testing (GitHub)
-----BEGIN CERTIFICATE-----
MIICjzCCAhWgAwIBAgIQXIuZxVqUxdJxVt7NiYDMJjAKBggqhkjOPQQDAzCBiDEL
MAkGA1UEBhMCVVMxEzARBgNVBAgTCk5ldyBKZXJzZXkxFDASBgNVBAcTC0plcnNl
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MDAwMDAwWhcNMzgwMTE4MjM1OTU5WjCBiDELMAkGA1UEBhMCVVMxEzARBgNVBAgT
Ck5ldyBKZXJzZXkxFDASBgNVBAcTC0plcnNleSBDaXR5MR4wHAYDVQQKExVUaGUg
VVNFUlRSVVNUIE5ldHdvcmsxLjAsBgNVBAMTJVVTRVJUcnVzdCBFQ0MgQ2VydGlm
aWNhdGlvbiBBdXRob3JpdHkwdjAQBgcqhkjOPQIBBgUrgQQAIgNiAAQarFRaqflo
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o4N+LZfQYcTxmdwlkWOrfzCjtHDix6EznPO/LlxTsV+zfTJ/ijTjeXmjQjBAMB0G
A1UdDgQWBBQ64QmG1M8ZwpZ2dEl23OA1xmNjmjAOBgNVHQ8BAf8EBAMCAQYwDwYD
VR0TAQH/BAUwAwEB/zAKBggqhkjOPQQDAwNoADBlAjA2Z6EWCNzklwBBHU6+4WMB
znuqQhFkoJ2UOQIReVx7Hfpkue4WQrO/isIJxOzksU0CMQDpKmFHjFJKS04YcPbW
RNZu9YO6bVi9JNlWSOrvxKJGgYhqOkbRqZtNyWHa0V1Xahg=
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIDqDCCAy6gAwIBAgIRAPNkTmtuAFAjfglGvXvh9R0wCgYIKoZIzj0EAwMwgYgx
CzAJBgNVBAYTAlVTMRMwEQYDVQQIEwpOZXcgSmVyc2V5MRQwEgYDVQQHEwtKZXJz
ZXkgQ2l0eTEeMBwGA1UEChMVVGhlIFVTRVJUUlVTVCBOZXR3b3JrMS4wLAYDVQQD
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MjAwMDAwMFoXDTMwMTIzMTIzNTk1OVowgY8xCzAJBgNVBAYTAkdCMRswGQYDVQQI
ExJHcmVhdGVyIE1hbmNoZXN0ZXIxEDAOBgNVBAcTB1NhbGZvcmQxGDAWBgNVBAoT
D1NlY3RpZ28gTGltaXRlZDE3MDUGA1UEAxMuU2VjdGlnbyBFQ0MgRG9tYWluIFZh
bGlkYXRpb24gU2VjdXJlIFNlcnZlciBDQTBZMBMGByqGSM49AgEGCCqGSM49AwEH
A0IABHkYk8qfbZ5sVwAjBTcLXw9YWsTef1Wj6R7W2SUKiKAgSh16TwUwimNJE4xk
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VR0fBEkwRzBFoEOgQYY/aHR0cDovL2NybC51c2VydHJ1c3QuY29tL1VTRVJUcnVz
dEVDQ0NlcnRpZmljYXRpb25BdXRob3JpdHkuY3JsMHYGCCsGAQUFBwEBBGowaDA/
BggrBgEFBQcwAoYzaHR0cDovL2NydC51c2VydHJ1c3QuY29tL1VTRVJUcnVzdEVD
Q0FkZFRydXN0Q0EuY3J0MCUGCCsGAQUFBzABhhlodHRwOi8vb2NzcC51c2VydHJ1
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4ToKFbZl+/OnFFzqnvOhcjHvClECEQcKmc8fmA==
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----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7GjTLWHfcMAAdwAZhtTHKKpv/roDb3gqTQGRqs4tcjEPrs5dcEEtJUzH1AAAAZTT
a5PtAAAEAwBIMEYCIQDlrInx7J+3MfqgxB2+Fvq3dMlk1qj4chOw/+HkYVfG0AIh
AMT+JKAQfUuIdBGxfryrGrwsOD3pRs1tyAyykdPGRgsTAHYAyzj3FYl8hKFEX1vB
3fvJbvKaWc1HCmkFhbDLFMMUWOcAAAGU02uUJQAABAMARzBFAiEA1GKW92agDFNJ
IYrMH3gaJdXsdIVpUcZOfxH1FksbuLECIFJCfslINhc53Q0TIMJHdcFOW2tgG4tB
A1dL881tXbMnMCUGA1UdEQQeMByCCmdpdGh1Yi5jb22CDnd3dy5naXRodWIuY29t
MAoGCCqGSM49BAMCA0cAMEQCIHGMp27BBBJ1356lCe2WYyzYIp/fAONQM3AkeE/f
ym0sAiBtVfN3YgIZ+neHEfwcRhhz4uDpc8F+tKmtceWJSicMkA==
-----END CERTIFICATE-----

About X.509 Certificates

X.509 certificates are digital documents that bind a public key to an identity, forming the foundation of secure communication on the internet.

These certificates contain critical information: the domain name they protect, the organization that owns them, validity periods, cryptographic keys, and digital signatures from trusted Certificate Authorities (CAs).

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