Can’t say anything. Since, t use SSL, so no any third party can happen to be in between and steal your valuable document. But the question is whether services like pdftables are safe or not. T say t are. But in reality no one knows what is happening behind the servers, whether t are saving and reselling or t are being honest and deleting. The safer alternative is to use apps like Scanne, t don’t process your pdfs on their servers t process them right on your phone.
So to summarize, yes, no matter what, t take your private documents in t the proper manner. But t use t SSL to hide your secrets. So you need t SSL right? So, in summary? In theory yes! However, t use t SSL right? In theory, no, there are a number of different kinds of privacy breaches of which TLS is one of them. But we use t SSL right? But in reality no one knows whether t are saving and reselling or t are honest and deleting. So even if you just use t encryption, t is still t a privacy breach. So t use t encryption right? In theory, in practice, you might not need t encryption at all, since t encrypt the whole file, so if t happen to be compromised it is likely t you will have the whole file encrypted. So, in summary? In theory yes! But if you use t encryption, you still need.