Disappearing Messages Explained: How They Work on WhatsApp, Telegram and Signal, and What They Can't Do
Part of: Encryption basics, without the jargonChecked against each app's own announcements and help pages, 6 November 2026. Apps change; check the date.
"Disappearing messages" sounds like a magic eraser. It isn't. It is a timer that tells every phone in the chat to delete messages after a set time. That is genuinely useful (an old chat can't be read if a phone is lost or seized later), but it has clear limits, and the details differ between apps.
Short answer: WhatsApp: 24 hours, 7 days or 90 days, per chat or as a default for new chats; in groups admins can restrict who changes it. Telegram: "auto-delete" in any chat (1 day, 1 week, 1 month or custom), plus self-destruct timers in one-to-one Secret Chats; in groups only admins set it. Signal: presets from 30 seconds to 4 weeks or a custom time, per chat or as a default. In every app the timer starts when a message is sent, applies only to new messages, and cannot stop screenshots, forwards, photos of the screen, or backups made before the timer ran out.
How a disappearing-message timer works
- Someone in the chat turns on a timer, for example 7 days. Everyone sees a line saying so.
- Each message sent after that moment carries the timer.
- When the time is up, each phone deletes its copy. In apps that store messages on a server (Telegram cloud chats), the server deletes its copy too.
- Messages sent before the timer was turned on stay.
The options in each app (checked 6 Nov 2026)
| App | Timer choices | Default for new chats | Who can change it in a group | Encrypted end to end? |
|---|---|---|---|---|
| 24 hours, 7 days, 90 days | Yes (Settings > Privacy > Default message timer) | Anyone, unless admins restrict group settings | Yes, by default | |
| Telegram | Auto-delete: 1 day, 1 week, 1 month, custom; Secret Chats: self-destruct timer | Yes (global auto-delete timer) | Admins only | Only one-to-one Secret Chats |
| Signal | 30 seconds to 4 weeks, or custom | Yes (Settings > Privacy > Default timer for new chats) | Admins can restrict who edits group settings | Yes, always |
Sources: WhatsApp, default disappearing messages and multiple durations (6 Dec 2021), Telegram, auto-delete in all chats (Feb 2021), Signal support, set and manage disappearing messages, Signal blog, disappearing by default.
Open a chat > the contact or group name > Disappearing messages, and choose 24 hours, 7 days or 90 days. For every new chat: Settings > Privacy > Default message timer. The default never changes or deletes your existing chats.
Telegram
In any chat, the auto-delete timer erases messages for all participants after the chosen time, counted from when each message was sent. In groups and channels only admins can set it. Separately, one-to-one Secret Chats (the only end-to-end encrypted chats in Telegram) have their own self-destruct timer. Ordinary group chats are stored on Telegram's servers in a form Telegram can read.
Signal
Open a chat > settings > Disappearing messages, or set Settings > Privacy > Default timer for new chats. Signal offers presets from 30 seconds to 4 weeks and a custom time.
What disappearing messages can NOT do
- Screenshots and photos of the screen. Anyone in the chat can capture a message before it goes.
- Forwarding and copying. A forwarded copy lives on in the other chat.
- Backups. A backup made before the timer ran out can contain the message.
- Saved media. Photos saved to a phone's gallery stay there.
- Notifications. A preview on a lock screen or a smartwatch can show the text.
- Trust. It protects you from the future (a lost phone, a nosy person later), not from the person you are talking to.
So the honest rule is: use disappearing messages to keep chats tidy and limit what a lost phone reveals; don't send anything you would hate to see screenshotted.
How Nadeemi does it
Nadeemi is the app we build, so weigh this section accordingly. Every chat has a ⏱ button: off, 24 hours, 7 days or 90 days (in a one-to-one chat either person can set it; in groups only admins). The setting travels inside the encrypted chat, each device deletes expired messages from its own stored history, and our server deletes its stored copy of the encrypted message on time too, along with attached photos and voice notes. You can set a default timer for new chats in Settings, and Circles (small private groups) can have disappearing posts. As in every app, people can still copy or screenshot, and we say so on the screen. Private messages and group chats are encrypted on your device with MLS in the beta; we label them "end-to-end encryption coming" until an independent audit is published.
FAQ
Do disappearing messages delete messages sent before I turned them on? No. In WhatsApp, Telegram, Signal and Nadeemi the timer applies only to messages sent after it was set.
When does the timer start? When the message is sent, not when it is read (WhatsApp's 24 h / 7 d / 90 d, Telegram auto-delete, and Nadeemi all count from sending).
Can someone still screenshot a disappearing message? Yes. Screenshots, photos of the screen, forwards and backups can all keep a copy.
Are Telegram disappearing messages encrypted? Only in one-to-one Secret Chats. Auto-delete in normal chats and groups deletes messages from Telegram's servers, but those chats are not end-to-end encrypted.
Which app has the most flexible timer? Signal, with presets from 30 seconds to 4 weeks and a custom option. WhatsApp offers three fixed choices.
Sources (checked 6 November 2026)
- WhatsApp blog, default disappearing messages and multiple durations (6 Dec 2021): https://blog.whatsapp.com/more-control-and-privacy-with-default-disappearing-messages-and-multiple-durations
- Meta newsroom, the same announcement: https://about.fb.com/news/2021/12/whatsapp-default-disappearing-messages-multiple-durations/
- Telegram blog, auto-delete, widgets and expiring invite links (Feb 2021): https://telegram.org/blog/autodelete-inv2
- Signal support, set and manage disappearing messages: https://support.signal.org/hc/en-us/articles/360007320771-Set-and-manage-disappearing-messages
- Signal blog, embrace ephemerality with default disappearing messages: https://signal.org/blog/disappearing-by-default/
- Nadeemi, what we can and can't see: https://nadeemi.com/what-we-can-see/
Names of other apps are trademarks of their owners, used only for comparison. Nadeemi is not affiliated with any of them.
Drafted with AI help and checked by a person on the date above.