SendFileOnline (Web): Share Files Only With a 6-Digit Code
For extra security while sharing files online, SendFileOnline (SFO) gives a cool solution. When you upload files to the site, it gives you a unique 6-digit code. Share that code with your friends instead of a full link, and anyone who happens to read your message won't know what it's about.
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Of course, this requires you and your friend to discuss in advance that you will exchange files via SFO. But once that is set up, it's as simple as messaging those six digits, like a PIN code, instead of full links that can be tracked later. Plus, you can set the files to be deleted after 24 hours or one week.