Zoom’s end-to-end encryption (E2EE) has arrived in technical preview, letting both free and paid users secure their calls. Zoom says E2EE is supported across its Mac, PC, iOS, and Android apps, as well as Zoom Rooms.

Available now for Mac, PC, iOS, and Android
A padlock on the green shield at the top left of Zooms window shows the meeting is end-to-end encrypted.
Image: Zoom
Zooms end-to-end encryption (E2EE) has arrived, letting both free and paid users secure their meetings so that only participants, not Zoom or anyone else, can access their content. Zoom says E2EE is supported across its Mac, PC, iOS, and Android apps, as well as Zoom Rooms, but not its web client or third-party clients that use the Zoom SDK.
E2EE has launched in technical preview, which means Zoom is asking for feedback on the feature for 30 days. However, the company says that E2EE will continue to be available after this period. Instructions on how to enable it can be found in Zooms help center.
Zoom has previously offered encryption for its calls, but the data was only encrypted between each meeting participant and Zooms servers, rather than being end-to-end encrypted between participants. Once E2EE is enabled, you can check Zoom is using the more secure kind of encryption using the green shield at the top left of a meeting window. The shield will show a padlock rather than a checkmark if the meeting is encrypted end-to-end.
Although E2EE meetings are more secure, they dont work with a few of Zooms features. These include its cloud recording, live transcription, polling, meeting reactions, and join before host features. Participants also wont be able to join using telephone, SIP/H.323 devices, on-premise configurations, or Lync/Skype clients, as Zoom says these cant be end-to-end encrypted.
Zooms E2EE meetings support a maximum of 200 participants. That wont affect users on Zooms Basic or Pro plans, which max out at 100 participants, but it could be a problem for Business or Enterprise subscribers which would otherwise allow for up to 300 or 500 participants.
End-to-end encryption is available for both free and paid users, but Zoom says free accounts will need to verify their phone number using SMS and also need a valid billing option associated with their account. Initially Zoom said end-to-end encryption wouldnt be available for free users to prevent the service from being used for unlawful activity, but the company quickly backtracked and announced it would be available for everyone later that month.
This initial launch is just the first of four phases Zoom is planning for its end-to-end encryption offering. The next phase, which is scheduled to include better identity management and support for single sign-on, is currently planned to launch next year.