Cryptee can be used to safely and securely encrypt both text and files. The encrypted data can be accessed only by using the private keys stored on the Trezor device. Cryptee is open-source, with its code public on GitHub.
See also: Cryptee FAQ
How to use Trezor with Cryptee
- Plug in your Trezor device, upload the file you want to encrypt, set a key (it is important to remember it) and click on Encrypt.
- To decrypt the file back, use your key and your Trezor device once again.
Anyone trying to decrypt your files would need to have access both to your key and to your Trezor device.