Upload a .pem or .cer file to decode its SSL/TLS certificate details. Processing is done locally in your browser.

Certificate File (.pem or .cer)

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About SSL/TLS Certificate Decoder

This tool decodes SSL/TLS certificates from .pem or .cer files to display details such as issuer, subject, validity, and serial number. It is useful for:

Analyzing certificate details for troubleshooting
Verifying certificate authenticity and configuration
Inspecting certificates for security audits
Understanding certificate properties for network management

Note: All processing is done locally in your browser using the Forge.js library. Only .pem and .cer files are supported.