Google has released Gmail’s end-to-end encryption (E2EE) for all Android and iOS devices, giving business users the ability to read and write encrypted emails directly, without needing other programs.

This week marks the start of encrypted emails arriving as standard emails in Gmail users’ inboxes on the Gmail app.

Those without the Gmail mobile app, who use different email providers, can view these encrypted emails in a web browser, no matter their device or service.

“Now, users can create and view E2EE messages directly in the Gmail app on Android and iOS. There’s no need to download additional programs or use special email websites. Gmail E2EE license holders can send encrypted emails to anyone, regardless of the recipient’s email address,” Google shared on Thursday.

“This release delivers the best possible privacy and data encryption combined with an easy-to-use experience for all users, providing simple email encryption for all, from small businesses to large corporations, and the public sector.”

This function is now live for all client-side encryption (CSE) users with Enterprise Plus licenses and either the Assured Controls or Assured Controls Plus add-on, after administrators enable the Android and iOS capabilities in the CSE admin settings through the Admin Console.

To dispatch an end-to-end encrypted email, Gmail users need to activate the “Additional encryption” feature by selecting the Lock icon while composing the message.

In October, Google also announced that business Gmail users now have the capability to send end-to-end encrypted emails to recipients using any email provider.

Gmail’s end-to-end encryption (E2EE) is built on top of client-side encryption (CSE), which enables Google Workspace organizations to utilize independently controlled encryption keys, stored outside of Google’s infrastructure, to safeguard confidential documents and emails.

As a result, messages and attachments are encrypted on the user’s device prior to being sent to Google’s servers, which assists in meeting regulatory obligations like data residency, HIPAA, and export regulations by ensuring that neither Google nor any third party has access to the data.

Gmail CSE was first launched in Gmail on the web in December 2022 as a beta version, after an initial beta rollout to Google Drive, Google Docs, Sheets, Slides, Google Meet, and Google Calendar. It officially became available for Google Workspace Enterprise Plus, Education Plus, and Education Standard subscribers in February 2023.

The company began beta testing its new end-to-end encryption (E2EE) system for business Gmail users in April 2025.