BoxCryptor is an encryption software optimized for Dropbox with data or files encryption. It encrypted a specific folder on your hard disk, if you want to decrypt the data have to go through BoxCryptor “virtual disk drives” mount access it, so even if you don’t use Dropbox BoxCryptor also can be used to encrypt important files in PC.

The Best (Free) Encryption Software for Cloud Storage Encrypting individual files. Your Dropbox folder inside Boxcryptor looks like a normal Finder window. The only difference is that it will be synced with the Dropbox folder. Now, if you want to encrypt files inside the folder, you can Right Click Boxcryptor Encrypt. This will almost instantly encrypt the selected file. How Secure Is Dropbox? a Comprehensive Examination | Canto Jan 28, 2020

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BoxCryptor is an encryption software optimized for Dropbox with data or files encryption. It encrypted a specific folder on your hard disk, if you want to decrypt the data have to go through BoxCryptor “virtual disk drives” mount access it, so even if you don’t use Dropbox BoxCryptor also can be used to encrypt important files in PC.