How to use DigiCert SSL Checker
- Paste or load a PEM certificate into DigiCert SSL Checker.
- Hit Parse certificate and DigiCert SSL Checker computes the result client-side.
- Review the subject, issuer, validity dates and expiry shown below.
About this tool
Everything DigiCert SSL Checker does happens on your own device. DigiCert SSL Checker decodes a pasted PEM certificate by walking its ASN.1/DER structure locally to read subject, issuer, validity window and serial.
The expiry countdown is computed locally, and nothing about the certificate is transmitted. No data is sent anywhere, so it stays fast and private by default.
Frequently asked questions
How do I use DigiCert SSL Checker?
Use DigiCert SSL Checker to check your input without installing anything; everything happens client-side.
Does DigiCert SSL Checker cost anything?
No — DigiCert SSL Checker is completely free, with no sign-up and no hidden limits.
Does DigiCert SSL Checker upload my data?
No — DigiCert 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 DigiCert SSL Checker?
Export the certificate from your browser's padlock as PEM and paste it into DigiCert SSL Checker; it decodes the ASN.1/DER fields entirely on your device.
Does DigiCert SSL Checker work offline?
Once the page has loaded, DigiCert SSL Checker keeps working with no network connection.