How to use Check SSL Certificate Validity
- Drop your text into the field at the top of Check SSL Certificate Validity.
- Set Paste a certificate to check its expiry 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
There is no server behind Check SSL Certificate Validity. Check SSL Certificate Validity decodes a pasted PEM certificate in your browser to read its subject, issuer, validity and serial.
Export a site certificate from the browser padlock as PEM to inspect it here. Your input never leaves the page, and no account or install is required.
Frequently asked questions
How do I use Check SSL Certificate Validity?
Check SSL Certificate Validity runs entirely on your device: add your input using the Paste a certificate to check its expiry control, and it checks it locally in real time.
Is Check SSL Certificate Validity free to use?
Yes — Check SSL Certificate Validity is completely free, with no usage limits.
Does Check SSL Certificate Validity upload my data?
No — Check SSL Certificate Validity processes everything locally in your browser, so nothing you enter is uploaded or stored.
How do I inspect a live site's certificate with Check SSL Certificate Validity?
Export the certificate from your browser's padlock as PEM and paste it into Check SSL Certificate Validity; it decodes the fields locally.
Does Check SSL Certificate Validity work offline?
Once the page has loaded, Check SSL Certificate Validity keeps working with no network connection.