SSL Certificate Decoder — Parse PEM Certificate Online
Decode and inspect SSL/TLS certificates in PEM format. View subject, issuer, validity dates, SANs, and fingerprints.
- Paste a PEM certificate (between BEGIN/END CERTIFICATE lines)
- Parsing is done entirely in your browser — no server upload
- SHA-256 fingerprint is computed from the full DER-encoded certificate
Frequently Asked Questions about SSL Certificate Decoder
- Is SSL Certificate Decoder completely free to use?
- Yes, SSL Certificate Decoder is 100% free with no sign-up, no watermarks, and no usage limits.
- Is my data private?
- SSL Certificate Decoder runs entirely in your browser — no data is ever sent to our servers. Your content stays on your device.
- Does it work offline?
- Once the page has loaded, SSL Certificate Decoder works fully offline in your browser — no internet connection is required.
- Is my sensitive data processed locally?
- Yes, all cryptographic operations run in your browser using the Web Crypto API. Your keys and secrets never leave your device.
- Does SSL Certificate Decoder work on mobile and tablet?
- Yes, SSL Certificate Decoder is fully responsive and works in all modern browsers on desktop, tablet, and mobile.
This tool runs entirely in your browser. No data is ever sent to our servers.