How to use CSR SSL Checker
- Drop your text into the field at the top of CSR SSL Checker.
- Use the Paste a PEM certificate request (CSR) setting to control the result.
- CSR SSL Checker updates the output automatically as you type.
- Use Copy to keep or reuse the result.
About this tool
Everything CSR SSL Checker does happens on your own device. CSR SSL Checker parses the X.509 fields of a certificate you paste, locally.
Nothing about the certificate is transmitted. Your input never leaves the page, and no account or install is required.
Frequently asked questions
What is CSR SSL Checker for?
CSR SSL Checker runs entirely on your device: add your input using the Paste a PEM certificate request (CSR) control, and it checks it locally in real time.
Is CSR SSL Checker free to use?
Yes — CSR SSL Checker is completely free, with no usage limits.
Does CSR SSL Checker upload my data?
No — CSR SSL Checker processes everything locally in your browser, so nothing you enter is uploaded or stored.
How do I inspect a live site's certificate with CSR SSL Checker?
Export the certificate from your browser's padlock as PEM and paste it into CSR SSL Checker; it decodes the fields locally.
Does CSR SSL Checker work offline?
Once the page has loaded, CSR SSL Checker keeps working with no network connection.