Do not use an apple device it will not allow you to download the certificates the software doesn’t believe that it is a trusted site
For downloading. - Try this link it’s the page before the other links
Read more...
http://coronavirus.san.gva.es/es/web/vacunacion/inicio
For some unknown reason you cannot access through an iPhone or IPad
Not sure about android devices
Using a pc you can print off or download two separate documents
The link posted earlier by Rolyat01 is for Justificante Covid - basically enter your date of birth, sip card number and issue date. Prove you are not a robot and then confirm to get a code issued to your mobile. Enter the code and what you basically get is a “receipt “ to confirm which vaccines you’ve had, batch number and where and when you had them. This is not a Covid passport
To get the EU COVID passport as per Jayne62 link
Go back to that main page a little lower you will see link for Covid Certicate UE.
Click on solicitor Covid takes you to a similar page to enter sip card date of birth etc.once you’ve entered the code from your mobile you get a choice of 3 certificates.it’s the left hand one you need to click on if you’ve been double jabbed. Cert will download for you to print off or transfer(email) to your phone