Security
SSL Certificate Decoder
Parse PEM certificates and view subject, issuer, dates, and fingerprint.
PEM is decoded with atob and parsed client-side using regex on the certificate bytes. Results are best-effort for common X.509 fields.
Related Tools
More free utilities you might find useful
Frequently Asked Questions
Quick answers to common questions
What format is supported?+
PEM-encoded X.509 certificates (-----BEGIN CERTIFICATE----- blocks).
How is the certificate parsed?+
The PEM base64 payload is decoded with atob and parsed client-side using regex on the certificate bytes.
Is my certificate uploaded?+
No. Parsing happens entirely in your browser.
Can I decode private keys?+
This tool decodes certificates only, not private keys.