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# [Telegram Desktop][telegram_desktop] – Official Messenger
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This is the complete source code and the build instructions for the official [Telegram][telegram] messenger desktop client, based on the [Telegram API][telegram_api] and the [MTProto][telegram_proto] secure protocol.
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[![Version ](https://badge.fury.io/gh/telegramdesktop%2Ftdesktop.svg )](https://github.com/telegramdesktop/tdesktop/releases)
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[![Build Status ](https://github.com/telegramdesktop/tdesktop/workflows/Windows./badge.svg )](https://github.com/telegramdesktop/tdesktop/actions)
[![Build Status ](https://github.com/telegramdesktop/tdesktop/workflows/MacOS./badge.svg )](https://github.com/telegramdesktop/tdesktop/actions)
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[![Build Status ](https://github.com/telegramdesktop/tdesktop/workflows/Linux./badge.svg )](https://github.com/telegramdesktop/tdesktop/actions)
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[![Preview of Telegram Desktop][preview_image]][preview_image_url]
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The source code is published under GPLv3 with OpenSSL exception, the license is available [here][license].
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## Supported systems
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The latest version is available for
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* [Windows 7 and above (64 bit) ](https://telegram.org/dl/desktop/win64 ) ([portable](https://telegram.org/dl/desktop/win64_portable))
* [Windows 7 and above (32 bit) ](https://telegram.org/dl/desktop/win ) ([portable](https://telegram.org/dl/desktop/win_portable))
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* [macOS 10.13 and above ](https://telegram.org/dl/desktop/mac )
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* [Linux static build for 64 bit ](https://telegram.org/dl/desktop/linux )
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* [Snap ](https://snapcraft.io/telegram-desktop )
* [Flatpak ](https://flathub.org/apps/details/org.telegram.desktop )
## Old system versions
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Version **4.9.9** was the last that supports older systems
* [macOS 10.12 ](https://updates.tdesktop.com/tmac/tsetup.4.9.9.dmg )
* [Linux with glibc < 2.28 static build ](https://updates.tdesktop.com/tlinux/tsetup.4.9.9.tar.xz )
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Version **2.4.4** was the last that supports older systems
* [OS X 10.10 and 10.11 ](https://updates.tdesktop.com/tosx/tsetup-osx.2.4.4.dmg )
* [Linux static build for 32 bit ](https://updates.tdesktop.com/tlinux32/tsetup32.2.4.4.tar.xz )
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Version **1.8.15** was the last that supports older systems
* [Windows XP and Vista ](https://updates.tdesktop.com/tsetup/tsetup.1.8.15.exe ) ([portable](https://updates.tdesktop.com/tsetup/tportable.1.8.15.zip))
* [OS X 10.8 and 10.9 ](https://updates.tdesktop.com/tmac/tsetup.1.8.15.dmg )
* [OS X 10.6 and 10.7 ](https://updates.tdesktop.com/tmac32/tsetup32.1.8.15.dmg )
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## Third-party
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* Qt 6 ([LGPL](http://doc.qt.io/qt-6/lgpl.html)) and Qt 5.15 ([LGPL](http://doc.qt.io/qt-5/lgpl.html)) slightly patched
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* OpenSSL 3.2.1 ([Apache License 2.0](https://www.openssl.org/source/apache-license-2.0.txt))
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* WebRTC ([New BSD License](https://github.com/desktop-app/tg_owt/blob/master/LICENSE))
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* zlib 1.2.11 ([zlib License](http://www.zlib.net/zlib_license.html))
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* LZMA SDK 9.20 ([public domain](http://www.7-zip.org/sdk.html))
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* liblzma ([public domain](http://tukaani.org/xz/))
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* Google Breakpad ([License](https://chromium.googlesource.com/breakpad/breakpad/+/master/LICENSE))
* Google Crashpad ([Apache License 2.0](https://chromium.googlesource.com/crashpad/crashpad/+/master/LICENSE))
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* GYP ([BSD License](https://github.com/bnoordhuis/gyp/blob/master/LICENSE))
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* Ninja ([Apache License 2.0](https://github.com/ninja-build/ninja/blob/master/COPYING))
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* OpenAL Soft ([LGPL](https://github.com/kcat/openal-soft/blob/master/COPYING))
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* Opus codec ([BSD License](http://www.opus-codec.org/license/))
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* FFmpeg ([LGPL](https://www.ffmpeg.org/legal.html))
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* Guideline Support Library ([MIT License](https://github.com/Microsoft/GSL/blob/master/LICENSE))
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* Range-v3 ([Boost License](https://github.com/ericniebler/range-v3/blob/master/LICENSE.txt))
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* Open Sans font ([Apache License 2.0](http://www.apache.org/licenses/LICENSE-2.0.html))
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* Vazir font ([SIL Open Font License 1.1](https://github.com/rastikerdar/vazir-font/blob/master/OFL.txt))
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* Emoji alpha codes ([MIT License](https://github.com/emojione/emojione/blob/master/extras/alpha-codes/LICENSE.md))
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* xxHash ([BSD License](https://github.com/Cyan4973/xxHash/blob/dev/LICENSE))
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* QR Code generator ([MIT License](https://github.com/nayuki/QR-Code-generator#license))
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* CMake ([New BSD License](https://github.com/Kitware/CMake/blob/master/Copyright.txt))
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* Hunspell ([LGPL](https://github.com/hunspell/hunspell/blob/master/COPYING.LESSER))
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## Build instructions
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* Windows [(32-bit)][win32] [(64-bit)][win64]
* [macOS][mac]
* [GNU/Linux using Docker][linux]
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[//]: # (LINKS)
[telegram]: https://telegram.org
[telegram_desktop]: https://desktop.telegram.org
[telegram_api]: https://core.telegram.org
[telegram_proto]: https://core.telegram.org/mtproto
[license]: LICENSE
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[win32]: docs/building-win.md
[win64]: docs/building-win-x64.md
[mac]: docs/building-mac.md
[linux]: docs/building-linux.md
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[preview_image]: https://github.com/telegramdesktop/tdesktop/blob/dev/docs/assets/preview.png "Preview of Telegram Desktop"
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[preview_image_url]: https://raw.githubusercontent.com/telegramdesktop/tdesktop/dev/docs/assets/preview.png