About X.509 Certificate Decoder
X.509 is an ITU-T standard for a public key infrastructure (PKI) and Privilege Management Infrastructure (PMI). It is commonly involved with SSL/TLS security. This operation displays the contents of a certificate in a human readable format, similar to the openssl command line tool. Tags: X509, server hello, handshake
Input: text. Output: text.
Format reference: Parse X.509 certificate background and specification
Example
Use “Try example” to load this public sample and its settings, then run it.
Settings used in this example
| Parameter | Example value | Input and choices |
|---|---|---|
| Input format | PEM | PEM, DER Hex, Base64, Raw |
Input
-----BEGIN CERTIFICATE----- MIIDUzCCAjugAwIBAgIUC4IiF9SNZElZqmHgKQFkpSLg+mUwDQYJKoZIhvcNAQEL BQAwOTEfMB0GA1UEAwwWd2VibWNwLmV4YW1wbGUuaW52YWxpZDEWMBQGA1UECgwN R3JpZCBIZWFwIEUyRTAeFw0yNjEwMTAxMTM2NTNaFw0yNjEwMTExMTM2NTNaMDkx HzAdBgNVBAMMFndlYm1jcC5leGFtcGxlLmludmFsaWQxFjAUBgNVBAoMDUdyaWQg SGVhcCBFMkUwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDNXqQomh1w rprw4mvv6v6dp0AAd4g2UmFniMbSSQZfd0pLuMEikAed6P+jP5EZT3vZXjnjxvrn 454YROGR+BqdLZeo5JyMjXO0ns96cJRs8RT5Iuuqm8kUD5bZ1wQWkeXKknnqVOEN zmaRbtf0j0DkLPjFyDCpxGUSJ2iEaJNibFXiy15xmo/ybmOIk8YqJ+r6uaDY4u14 jNulSmaDppvCSxt4bKhZSEUAZ4yFYPAAg6zt7KZF4mbqZ2xHAOi+E3CWQvNhfsPs 5YwRcha9LAPuLB6LNJ17RV44ZoX2il51qOE/gvEJiOwVCLaOczIw92dgb/cdSsnI 1Ea5VsoI0TNZAgMBAAGjUzBRMB0GA1UdDgQWBBT12+Vo+4X6Kn8y7Su1WyYIwB+o JzAfBgNVHSMEGDAWgBT12+Vo+4X6Kn8y7Su1WyYIwB+oJzAPBgNVHRMBAf8EBTAD AQH/MA0GCSqGSIb3DQEBCwUAA4IBAQAh+wT4PJWSEeekxWGjNcL55YBHID/km0BC wxRb8kWe2Y+VxTZLNTbioLkfTlYJnQQow0HHXgGqKt7Sc/VaATmg7DRwAahK5a7l xXjpB83/KxV9vxEyuDRNXRc5rej7itV3GVprfUN67EAlpeYrT0xCbNarhSLAA8Gk TbxDOjirb7Nzp1e0G+U0CA/bhTIH64lNsuIBMoIjVtgfglfi6WeFXZv1JxlKep/z GHXWREe1qUY3TmzxwLNMiS/DS7TMglCtSCo0E/TWsXuiOoU7Lqt6pK9+6J9CZMfd dt5W/6WG4W2T1dvLpDahCbq0vmKcdQPW1FdfZ0f+fDlAejyy5zz0 -----END CERTIFICATE-----
Result
The example demonstrates the configured operation. Generated values, timestamps or formatting may vary between runs.
Parameters
| Parameter | Default value | Input and choices |
|---|---|---|
| Input format | PEM | PEM, DER Hex, Base64, Raw |
Before interpreting the result
Parsing a certificate shows its fields; it does not establish trust in the issuer or validate a certificate chain. Signing and verification require the algorithm and key format expected by the other party.
How to use this page
- Paste your input or open a local file.
- Adjust tool options if needed, then choose Run tool.
- Copy the result or download the original output bytes.
Inputs and results are not added to the public catalogue or saved in the URL. Processing happens in your browser; HTTP Request and DNS over HTTPS send the requests you explicitly run. Files up to 128 MiB can be opened; decompression and image tools may have smaller processing limits. Large results have a shortened preview. Text and HTML downloads use UTF-8; binary downloads preserve output bytes. Pasted text follows browser newline handling; open a file when exact input bytes matter.