That’s a very good IDEA!! ![]()
Everyone who intends to keep their files safe, before uploading somewhere, should get them encrypted!!
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There are online encrypting sites(Did you check these?)

https://encode-decode.com/aes256-encrypt-online/ https://aesencryption.net/ and many more.. -
Check these various GitHub repositories:
https://gchq.github.io/CyberChef
https://github.com/topics/aes-256
https://github.com/topics/aes-encryption -
Check this previous thread:
There are many more…I mentioned a few of them!
Hope they work!!
Let us know if any of them worked and you have successfully encrypted/uploaded them.
All the Best!! ![]()
!