How to use SSL Certificate Checker Tool
- Drop your text into the field at the top of SSL Certificate Checker Tool.
- Adjust the Paste a PEM certificate (BEGIN/END lines) option to match what you need.
- Watch the output update instantly while you adjust the text.
- When it looks right, Copy to save it.
About this tool
SSL Certificate Checker Tool is a static, client-side tool with no backend. SSL Certificate Checker Tool decodes a pasted PEM certificate in your browser to read its subject, issuer, validity and serial.
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 SSL Certificate Checker Tool?
SSL Certificate Checker Tool runs entirely on your device: add your input using the Paste a PEM certificate (BEGIN/END lines) control, and it checks it locally in real time.
Do I need an account for SSL Certificate Checker Tool?
No — SSL Certificate Checker Tool needs no account, sign-up or installation.
Is my input private in SSL Certificate Checker Tool?
Yes — your input never leaves your device; SSL Certificate Checker Tool does all the work in your browser.
How do I inspect a live site's certificate with SSL Certificate Checker Tool?
Export the certificate from your browser's padlock as PEM and paste it into SSL Certificate Checker Tool; it decodes the fields locally.
Does SSL Certificate Checker Tool work offline?
Once the page has loaded, SSL Certificate Checker Tool keeps working with no network connection.