Short answer
For privacy, Signal is the strongest choice: everything is end-to-end encrypted and it has disappearing messages and view-once media. WhatsApp is a good second, with end-to-end encryption and view-once photos that block screenshots. Snapchat tells you when someone screenshots, but can't stop a second phone recording the screen.
What the features actually mean
- End-to-end encryption (E2EE): only you and the recipient can read the messages, not the app company, hackers on the network or anyone who gets into the company's servers. It doesn't stop the recipient saving anything.
- Disappearing messages: messages delete themselves after a set time. They can still be screenshotted or saved before then.
- View once: a photo or video that can only be opened once, then disappears.
- Screenshot blocking: the app prevents screenshots on the recipient's phone. A second phone or camera can still capture the screen.
- Screenshot alerts: the app tells you if the other person screenshots. It doesn't stop them.
The comparison
| App | End-to-end encrypted? | Disappearing messages | View once | Screenshots | Watch out for |
|---|---|---|---|---|---|
| Signal | Yes, always | Yes | Yes | No alert. "Screen security" setting blocks screenshots of your own screen on Android | Very little. Keep your phone locked |
| Yes, always | Yes | Yes. Screenshots of view-once media are blocked | Blocked for view once only | Chat backups to iCloud or Google Drive aren't encrypted unless you turn on encrypted backup. Normal photos auto-save to the gallery by default | |
| Snapchat | Yes, for snaps (photos and videos) | Yes, by default | Yes | Alerts the sender, but doesn't block | Memories saved to the cloud, third-party "saver" apps, and screen recording from another device |
| Telegram | No, only in "Secret Chats" | Yes | Yes | Blocked in Secret Chats | Normal chats are stored on Telegram's servers. Only use Secret Chats for anything intimate |
| iMessage | Yes (Apple to Apple only) | No | No | No alert | iCloud backups unless Advanced Data Protection is on. Green-bubble (SMS) messages aren't encrypted. Shared photo libraries |
| Instagram / Messenger | Messenger, yes by default. Instagram, check your settings | Yes (vanish mode) | Yes | Alerts in vanish mode and for view-once media | Linked to your real profile and contacts. Easy to send to the wrong account |
| SMS / text message | No | No | No | No alert | Avoid for anything intimate |
App features change often. We checked these in November 2026. Always check the current settings in the app itself.
Settings to change today
- Settings, Chats: turn off "Save to Photos" (iPhone) or "Media visibility" (Android)
- Settings, Chats, Chat backup: turn on "End-to-end encrypted backup"
- Settings, Privacy: turn on "App lock" or "Chat lock" for intimate chats
- Use the "1" (view once) button when sending a photo
Signal
- Set a default disappearing message timer in Settings, Privacy
- Turn on "Screen lock" and, on Android, "Screen security"
Snapchat
- Don't save intimate snaps to Memories
- Make sure "My Eyes Only" has a PIN you haven't used anywhere else
- Never log in to third-party Snapchat apps. They can steal your snaps
Your phone
- Use a 6-digit PIN or longer, and biometric unlock
- Hide notification previews on the lock screen
- Use the hidden or locked album (iPhone "Hidden" album with Face ID, Android "Secure Folder" or "Locked Folder")
- Check which photo albums sync to shared family libraries
What about sexting sites and dating apps?
Dating apps are designed for meeting people, not for storing intimate images. Many scammers move conversations off dating apps quickly because the apps detect and ban them. Be extra cautious if someone you've just matched with wants to switch to WhatsApp, Telegram or Snapchat straight away. Read catfish and romance scams.
Need help right now?
If you or someone else is in immediate danger, call 999 (UK), 112 (Ireland/EU), 911 (US/Canada) or 000 (Australia).
- Images shared or threatened (adults, UK): Revenge Porn Helpline, revengepornhelpline.org.uk or 0345 6000 459
- Stop images spreading (worldwide, adults): StopNCII.org
- Under 18: Childline's Report Remove tool at childline.org.uk or call 0800 1111. Outside the UK: Take It Down
- More countries and services: see our help and support directory