Telegram – cloud-based instant messaging and voice over IP service

Telegram is a cloud-based instant messaging and voice over IP service.

You can use Telegram on all your devices at the same time — your messages sync seamlessly across any number of your phones, tablets or computers.

Telegram’s client-side code is open-source software, whereas its server-side code is closed-source and proprietary.

Features include:

  • Make voice calls.
  • Telegram groups can have up to 100,000 members each.
  • Channels can be created for broadcasting messages to an unlimited number of subscribers.
  • Unified history.
  • Instant search.
  • Smart notifications – mute the group to get notifications only when people mention you or reply to your messages.
  • Pinned messages.
  • Moderation tools.
  • Night mode.
  • Customization via bots – create custom tools for any specific needs using a Bot API and Inline Bots.
  • Access your messages from several devices at once, including tablets and computers, and share an unlimited number of photos, videos and files (doc, zip, mp3, etc.) of up to 1.5 GB each.
  • Bot API, a platform for developers that allows anyone to easily build specialized tools for Telegram, integrate any services, and accept payments from users around the world.
  • Stickers are cloud-based, high-definition images intended to provide more expressive emoji.
  • All Telegram chats and group chats are private among their participants.
  • Secret chats use end-to-end encryption, leave no trace on Telegram’s servers, support self-destructing messages and don’t allow forwarding.
  • Server-client encryption is used in Cloud Chats (private and group chats), Secret Chats use an additional layer of client-client encryption. All data, regardless of type, is encrypted in the same way. Encryption is based on 256-bit symmetric AES encryption, 2048-bit RSA encryption, and Diffie–Hellman secure key exchange.
  • Security is based on the MTProto protocol.
  • Cross platform support – runs on Linux, MacOS, Windows, Android, and iPhone.
  • Officially available in English, Spanish, German, Dutch, Italian, Arabic, Portuguese and Korean.

Support: FAQ, GitHub code repository
Developer: Pavel and Nikolai Durov
License: GNU General Public License v3.0. Server is proprietary software.


Telegram is written in C++. Learn C++ with our recommended free books and free tutorials.

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