Sep 9, 2026
PEM Certificate Decoder: Read SSL Certificates and RSA Keys Like a Pro
Inspect certs and keys without leaving the browser.
Read postPEM Certificate & RSA Key Decoder
Inspect certs and keys without leaving the browser.
✏️ Sketching your tool…
About PEM Certificate & RSA Key Decoder
Paste a PEM certificate or RSA public key to parse the subject, issuer, validity, and key info.
🔒 This tool runs entirely in your browser. Nothing is uploaded or stored.
Frequently Asked Questions about PEM Certificate & RSA Key Decoder
How do I use the PEM Certificate & RSA Key Decoder?
Open the PEM Certificate & RSA Key Decoder and use the controls in the workspace below: inspect certs and keys without leaving the browser. Results appear instantly in your browser, with nothing to install, sign up for, or pay for.
Is the PEM Certificate & RSA Key Decoder free?
Yes. The PEM Certificate & RSA Key Decoder is completely free, like every tool in the PrimeFreeTools library. There are no accounts, subscriptions, or usage limits.
Does the PEM Certificate & RSA Key Decoder store or share my data?
No. The PEM Certificate & RSA Key Decoder runs with JavaScript in your browser, so what you enter never leaves your device and nothing is stored on a server.
What can I use the PEM Certificate & RSA Key Decoder for?
Paste a PEM certificate or RSA public key to parse the subject, issuer, validity, and key info. You will find it grouped under Developer Tools together with 75 other free tools on the PrimeFreeTools homepage.