Will public key change on renewing a certificate?

Question

HI, When i renew an SSL certificate will the public key change or be the same as the expired certificate?

Answer 1

If you re-use the same certificate request, the key will not change. If you generate a new request, that'll generate a new key.

If your certificate authority is not requiring a certificate request, then they must be re-using the old one.

Answer 2

The certificate has nothing to do with the keys. Essentially the certificate is just a signature of your public key. You continue to reuse the same key (unless your old public key has an expiry date that's passed).