SSL Certificate Decoder
Decode PEM-encoded X.509 certificates to view subject, issuer, validity, SANs, and more. All processing is local.
Frequently Asked Questions
How often should I check?
After DNS changes, wait 24-48h for propagation then verify. Monitor weekly for changes.
Can I check any domain?
Yes, any publicly accessible domain or IP. Private addresses are not reachable.
Why differ from other tools?
Different tools query different servers or use different methods. We show raw responses.
Is my query logged?
No. Queries processed in real time and not stored.
How to Use
- Review detailed results
- Enter domain, IP, or URL to check
- Copy data or export report
- Click Lookup or press Enter
FAQ
What certificate formats are supported?
PEM-encoded X.509 certificates (the standard format starting with -----BEGIN CERTIFICATE-----) are supported.
What information can I extract?
Subject, issuer, serial number, validity period, signature algorithm, public key details, and Subject Alternative Names (SANs).
Is my certificate data secure?
Yes, all decoding happens locally in your browser. No certificate data is transmitted to any server.
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