How to use Domain SSL Checker
- Add a PEM certificate to Domain SSL Checker to get started.
- Hit Parse certificate and Domain SSL Checker computes the result client-side.
- Review the subject, issuer, validity dates and expiry shown below.
About this tool
There is no server behind Domain SSL Checker. Paste a PEM certificate and Domain SSL Checker parses the X.509 fields entirely on your device.
The expiry countdown is computed locally, and nothing about the certificate is transmitted. Your input never leaves the page, and no account or install is required.
Frequently asked questions
How do I use Domain SSL Checker?
Domain SSL Checker lets you check your input right in the browser, with the result shown instantly and nothing uploaded.
Is Domain SSL Checker free to use?
Yes — Domain SSL Checker is completely free, with no usage limits.
Is my input private in Domain SSL Checker?
Yes — your input never leaves your device; Domain SSL Checker does all the work in your browser.
How do I inspect a live site's certificate in Domain SSL Checker?
Export the certificate from your browser's padlock as PEM and paste it into Domain SSL Checker; it decodes the ASN.1/DER fields entirely on your device.
Does Domain SSL Checker work on mobile?
Yes — Domain SSL Checker is just a web page and runs on any modern browser, including phones and tablets.