BTALK is a free Chrome add-on designed to enhance email security for Gmail and Outlook users through end-to-end encryption (E2EE). It utilizes a combination of proven classical and post-quantum encryption algorithms to ensure that emails remain confidential, even against future quantum computing threats. Emails are encrypted directly in the user's browser, meaning that the server only sees unreadable text. Only recipients using BTALK can decrypt and read the messages, providing a secure communication environment.

The add-on features one-click encryption and decryption within Gmail, support for encrypted attachments, and automatic verification of BTALK certificates before sending emails. Users can connect their Google account for synchronization of encryption keys across devices. With a focus on privacy, BTALK is ideal for professionals, journalists, and anyone concerned about the confidentiality of their communications.