How to use Check SSL Version
- Paste or load a PEM certificate into Check SSL Version.
- Click Parse certificate — Check SSL Version processes everything on your device.
- Use the subject, issuer, validity dates and expiry Check SSL Version produces — nothing was uploaded.
About this tool
There is no server behind Check SSL Version. Paste a PEM certificate and Check SSL Version parses the X.509 fields entirely on your device.
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
What does Check SSL Version do?
Check SSL Version runs entirely on your device: add your input, and it checks it locally in real time.
Is Check SSL Version free to use?
Yes — Check SSL Version is completely free, with no usage limits.
Where is my data processed by Check SSL Version?
Entirely in your browser — Check SSL Version keeps your data on your own machine and sends nothing anywhere.
How do I inspect a live site's certificate in Check SSL Version?
Export the certificate from your browser's padlock as PEM and paste it into Check SSL Version; it decodes the ASN.1/DER fields entirely on your device.
Does Check SSL Version work on mobile?
Yes — Check SSL Version is just a web page and runs on any modern browser, including phones and tablets.