Certificate / CSR decoder

In browser

Decode certificates and CSRs without contacting a server

Input

This tool runs entirely in your browser. Nothing you type is sent to the server, so it is safe for tokens, keys and passwords — and it keeps working with the network unplugged.

Fill in the form and run the tool. Results appear here.

Certificate and CSR contents are processed locally in your browser. Decoding does not establish certificate trust or verify a CA chain.