PreCloud
I recently built PreCloud: Encrypt before upload
https://www.peng.kiwi/precloud
Encrypt your texts and files before uploading them to cloud.
Open source, no tracking and free forever.
PreCloud has no server, everything happens on your device. (your master password, the encryption process, the encrypted texts and files)
You can safely upload the encrypted texts or files to wherever you want, making any cloud provider an encrypted storage.
Hope it makes protecting your privacy easier.
