Qualys SSL Checker
Qualys SSL Checker decodes a pasted PEM certificate in your browser to show its subject, issuer, validity dates and expiry.
Qualys SSL Checker decodes a pasted PEM certificate in your browser to show its subject, issuer, validity dates and expiry.
How to use Qualys SSL Checker
- Give Qualys SSL Checker a PEM certificate to work from.
- Hit Parse certificate and Qualys SSL Checker computes the result client-side.
- Read the subject, issuer, validity dates and expiry that Qualys SSL Checker lays out for you.
About this tool
Qualys SSL Checker runs entirely in your browser. Paste a PEM certificate and Qualys SSL Checker parses the X.509 fields entirely on your device.
To check a live site, export its certificate from the browser padlock as PEM and paste it here. No data is sent anywhere, so it stays fast and private by default.
Frequently asked questions
How do I use Qualys SSL Checker?
Qualys SSL Checker runs entirely on your device: add your input, and it checks it locally in real time.
Is Qualys SSL Checker free to use?
Yes — Qualys SSL Checker is completely free, with no usage limits.
Does Qualys SSL Checker upload my data?
No — Qualys SSL Checker processes everything locally in your browser, so nothing you enter is uploaded or stored.
How do I inspect a live site's certificate in Qualys SSL Checker?
Export the certificate from your browser's padlock as PEM and paste it into Qualys SSL Checker; it decodes the ASN.1/DER fields entirely on your device.
Does Qualys SSL Checker work offline?
Once the page has loaded, Qualys SSL Checker keeps working with no network connection.