Telegram

Telegram says it stores only the data needed to function as a secure and feature-rich messaging service.

Secret Chats provide a stronger privacy mode than the default cloud-chat model.

Telegram says it does not use user data to build advertising profiles.

Cloud messages, media, and contacts can still be stored by Telegram unless users choose modes and settings carefully.

Phone numbers, public usernames, bots, groups, contacts, and legal requests can still create exposure beyond one private chat window.

Telegram says it does not use user data to show ads.

Secret Chats and device choices can keep some sensitive conversations outside Telegram's ordinary cloud-storage paths.

The privacy policy is explicit about where cloud-chat data is stored and why.

Cloud messaging metadata and account data are still processed to operate the service.

Telegram says it does not track users, build profiles, or sell data to advertisers.

The only cookies Telegram says it uses are those needed to operate web services.

Secret Chats and tighter privacy settings let users reduce some cloud-side behavioral exposure further.

Deleting an account removes messages, media, contacts, and other data stored in the Telegram cloud.

Secret Chats and user-controlled device storage can reduce the amount of cloud content that persists.

Users can delete synced contacts and manage data settings directly.

Cloud-chat copies, public or group content, and copies held by other participants can remain outside one user's deletion action.

Users can delete accounts, manage data settings, and delete synced contacts.

Secret Chats give users a distinct privacy-preserving mode for sensitive conversations.

Profile, phone-number, and contact-sync behavior can be managed by the user.

Default cloud chats are not equivalent to Secret Chats and can leave users with a weaker privacy posture if they never review the settings.