Hello

A while ago I could enter my paper wallet 'share address' via a qr code onto a site which then told me how much I held on that wallet.
I think it was on Blockchaininfo/blockchain.com?

I cannot see where to do this on this site any more.

Is there anywhere I can use the share address on my wallet securely using the qr code? 

I can see some warnings against this but I am confused as surely the public address is secure to share?

I do not have a smart phone and use the cam on my computer.

Thanks.