How to use SSL Certificate Checker
- Paste the text you need to check into the input box.
- Set Paste a PEM certificate (BEGIN/END lines) so the output fits your use case.
- The result is computed live in your browser as you edit the input.
- Use Copy to keep or reuse the result.
About this tool
SSL Certificate Checker is a static, client-side tool with no backend. SSL Certificate Checker parses the X.509 fields of a certificate you paste, locally.
Export a site certificate from the browser padlock as PEM to inspect it here. It behaves the same on desktop and mobile, with nothing stored remotely.
Frequently asked questions
What is SSL Certificate Checker for?
Use SSL Certificate Checker to check your input without installing anything using the Paste a PEM certificate (BEGIN/END lines) control; everything happens client-side.
Do I need an account for SSL Certificate Checker?
No — SSL Certificate Checker needs no account, sign-up or installation.
Where is my data processed by SSL Certificate Checker?
Entirely in your browser — SSL Certificate Checker keeps your data on your own machine and sends nothing anywhere.
How do I inspect a live site's certificate with SSL Certificate Checker?
Export the certificate from your browser's padlock as PEM and paste it into SSL Certificate Checker; it decodes the fields locally.
Does SSL Certificate Checker work offline?
Once the page has loaded, SSL Certificate Checker keeps working with no network connection.