How to use Test SSL Certificate
- Type or paste your text into Test SSL Certificate's input area.
- Tune the Paste a certificate to test (PEM) control before you check.
- Test SSL Certificate updates the output automatically as you type.
- When it looks right, Copy to save it.
About this tool
Test SSL Certificate runs entirely in your browser. Test SSL Certificate decodes a pasted PEM certificate in your browser to read its subject, issuer, validity and serial.
Nothing about the certificate is transmitted. It behaves the same on desktop and mobile, with nothing stored remotely.
Frequently asked questions
What is Test SSL Certificate for?
Test SSL Certificate runs entirely on your device: add your input using the Paste a certificate to test (PEM) control, and it checks it locally in real time.
Does Test SSL Certificate cost anything?
No — Test SSL Certificate is completely free, with no sign-up and no hidden limits.
Is my input private in Test SSL Certificate?
Yes — your input never leaves your device; Test SSL Certificate does all the work in your browser.
How do I inspect a live site's certificate with Test SSL Certificate?
Export the certificate from your browser's padlock as PEM and paste it into Test SSL Certificate; it decodes the fields locally.
Does Test SSL Certificate work offline?
Once the page has loaded, Test SSL Certificate keeps working with no network connection.