How to use OpenSSL Test Certificate Chain
- Give OpenSSL Test Certificate Chain a PEM certificate to work from.
- Click Parse certificate — OpenSSL Test Certificate Chain processes everything on your device.
- Read the subject, issuer, validity dates and expiry that OpenSSL Test Certificate Chain lays out for you.
About this tool
OpenSSL Test Certificate Chain runs entirely in your browser. OpenSSL Test Certificate Chain decodes a pasted PEM certificate by walking its ASN.1/DER structure locally to read subject, issuer, validity window and serial.
To check a live site, export its certificate from the browser padlock as PEM and paste it here. No data is sent anywhere, so it stays fast and private by default.
Frequently asked questions
What is OpenSSL Test Certificate Chain for?
OpenSSL Test Certificate Chain runs entirely on your device: add your input, and it checks it locally in real time.
Do I need an account for OpenSSL Test Certificate Chain?
No — OpenSSL Test Certificate Chain needs no account, sign-up or installation.
Where is my data processed by OpenSSL Test Certificate Chain?
Entirely in your browser — OpenSSL Test Certificate Chain keeps your data on your own machine and sends nothing anywhere.
How do I inspect a live site's certificate in OpenSSL Test Certificate Chain?
Export the certificate from your browser's padlock as PEM and paste it into OpenSSL Test Certificate Chain; it decodes the ASN.1/DER fields entirely on your device.
Does OpenSSL Test Certificate Chain work on mobile?
Yes — OpenSSL Test Certificate Chain is just a web page and runs on any modern browser, including phones and tablets.