You can also clear the entire chat history on both ends. On Telegram, deleted messages do not leave a mark in the chat. Together with privacy settings for forwarded messages , this makes exchanging Telegram messages similar to talking face to face without a tape recorder. As a result, our users no longer need to worry about the data accumulating in their chats over the years. Both parties in a conversation now have full control over what does and what doesn't belong to their online identity.
Voice calls are currently available to users around the world. We support emoji emoticons. Telegram groups can have up to , members each and are extremely powerful communication tools. Here are a few key features that make them stand out in the messaging world:. Unified history Edit your messages after posting, delete them so that they disappear for everyone.
Cross-platform availability Access your messages anytime, from any number of your mobile or desktop devices. Instant search Find the message you're looking for, even among millions. Filter by sender to make searching easier. Replies, mentions, hashtags Easily trace a conversation and keep communication efficient, no matter the group size.
Smart notifications Mute the group to get notifications only when people mention you or reply to your messages. Pinned messages You can pin any message to be displayed at the top of the chat screen.
All members will get a notification — even if they muted ordinary messages from your group. Moderation tools Appoint administrators that can mass-delete messages, control membership, and pin important messages. Define their admin privileges with granular precision. Group permissions Set default permissions to restrict all members from posting specific kinds of content.
Or even restrict members from sending messages altogether — and let the admins chat amongst themselves while everybody else is watching. File sharing Send and receive files of any type, up to 1,5 GB in size each, access them instantly on your other devices. Public groups Get a short link for your group and make it public, like t. This way, anybody can view the group's entire chat history and join to post messages. Telegram groups are ideal for sharing stuff with friends and family or collaboration in small teams. But groups can also grow very large and support communities of up to , members.
You can make any group public , toggle persistent history to control whether or not new members have access to earlier messages and appoint administrators with granular privileges. You can also pin important messages to the top of the screen so that all members can see them, including those who have just joined. Channels are a tool for broadcasting messages to large audiences. In fact, a channel can have an unlimited number of subscribers. When you post in a channel, the message is signed with the channel's name and photo and not your own.
Each message in a channel has a view counter that gets updated when the message is viewed, including its forwarded copies. Telegram groups are democratic by design. In the restricted mode, only administrators can add new people and change the name and photo of the group. You can define their admin privileges with granular precision — from deleting messages to appointing new administrators. You can add your contacts, or using search by username.
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It is easy to migrate existing groups to Telegram by sending people an invite link. Anyone who has Telegram installed will be able to join your group by following this link.
If you choose to revoke the link, it will stop working immediately. You can set up a public username on Telegram. Please note that people who find you will be able to send you messages, even if they don't know your number. If you are not comfortable with this, we advise against setting up a username in Telegram. You can set up a username in Settings and use the universal search box in the chat list to search for chats, messages, and usernames. Once you've set up a username, you can give people a t. Opening that link on their phone will automatically fire up their Telegram app and open a chat with you.
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You can share username links with friends, write them on business cards or put them up on your website. You can use a-z, and underscores. Usernames are case-insensitive, but Telegram will store your capitalization preferences e. Telegram and TeleGram is the same user. The username must be at least five characters long. If you are not comfortable with this, we advise against setting up a username.
Neither party will see another's phone number unless this is permitted by your privacy settings. This is similar to the case when you message a person who you've met in a Telegram group. Go to Settings and save an empty username. This will remove your username; people will no longer be able to find you via search. This will not affect existing conversations. We understand that certain usernames are part of an online identity for some of us. If your desired username is already taken, we will be happy to help you acquire it for your account or channel, provided that you have that same username on at least two of these services: Facebook, Twitter, Instagram.
Due to the fact that one account can register multiple bot and channel usernames, we reserve the right to recall usernames assigned to unused bots and channels, as well as openly squatted usernames. If a scammer is pretending to be you, please contact NoToScam. Telegram is more secure than mass market messengers like WhatsApp and Line. We are based on the MTProto protocol see description and advanced FAQ , built upon time-tested algorithms to make security compatible with high-speed delivery and reliability on weak connections.
We are continuously working with the community to improve the security of our protocol and clients. We've got you covered. On top of this, secret chats are not part of the Telegram cloud and can only be accessed on their devices of origin. We support two layers of secure encryption. 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 — be it text, media or files. You can find more info in the Advanced FAQ. See also: Do you process data requests? Telegram is open, anyone can check our source code , protocol and API , see how everything works and make an informed decision. In fact, we welcome security experts to audit our system and will appreciate any feedback at security telegram. On top of that, Telegram's primary focus is not to bring a profit , so commercial interests will never interfere with our mission. More about this below.
You can check out the Cracking Contest Description to learn more. Any comments on Telegram's security are welcome at security telegram. Please note that we can not offer bounties for issues that are disclosed to the public before they are fixed. Telegram can help when it comes to data transfer and secure communication. This means that all data including media and files that you send and receive via Telegram cannot be deciphered when intercepted by your internet service provider, owners of Wi-Fi routers you connect to, or other third parties.
But please remember that we cannot protect you from your own mother if she takes your unlocked phone without a passcode. Or from your IT-department if they access your computer at work. Or from any other people that get physical or root access to your phones or computers running Telegram. If you have reasons to worry about your personal security, we strongly recommend using only Secret Chats in official or at least verifiable open-source apps for sensitive information, preferably with a self-destruct timer. We also recommend enabling 2-Step Verification and setting up a strong passcode to lock your app, you will find both options in Settings — Privacy and Security.
Logging in with an SMS code is an industry standard in messaging, but if you're looking for more security or have reasons to doubt your mobile carrier or government, we recommend protecting your cloud chats with an additional password. Once enabled, you will need both an SMS code and a password to log in.
You can also set up a recovery email address that will help regain access, should you forget your password. If you do so, please remember that it's important that the recovery email account is also protected with a strong password and 2-Step Verification when possible.
Check this out for tips on creating a strong password that is easy to remember. Using a rooted or jailbroken device makes it easier for a potential attacker to gain full administrative control over your device — root access. A user with root access can easily bypass security features built into the operating system, read process memory or access restricted areas, such as the internal storage. Once an attacker has root access, any efforts to mitigate threats become futile.
No application can be called safe under these circumstances, no matter how strong the encryption. Secret chats are meant for people who want more secrecy than the average fella. All messages in secret chats use end-to-end encryption. This means only you and the recipient can read those messages — nobody else can decipher them, including us here at Telegram more on this here.
On top of this, Messages cannot be forwarded from secret chats. And when you delete messages on your side of the conversation, the app on the other side of the secret chat will be ordered to delete them as well. You can order your messages, photos, videos and files to self-destruct in a set amount of time after they have been read or opened by the recipient. The message will then disappear from both your and your friend's devices. All secret chats in Telegram are device-specific and are not part of the Telegram cloud. This means you can only access messages in a secret chat from their device of origin.
They are safe for as long as your device is safe in your pocket.
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Remember that Telegram secret chats are device-specific. If you start a secret chat with a friend on one of your devices, this chat will only be available on that device. If you log out, you will lose all your secret chats. You can create as many different secret chats with the same contact as you like. The Self-Destruct Timer is available for all messages in Secret Chats and for media in private cloud chats. To set the timer, simply tap the clock icon in the input field on iOS, top bar on Android , and then choose the desired time limit.
The clock starts ticking the moment the message is displayed on the recipient's screen gets two green checks. As soon as the time runs out, the message disappears from both devices. Please note that the timer in Secret Chats only applies to messages that were sent after the timer was set. It has no effect on earlier messages. Unfortunately, there is no bulletproof way of detecting screenshots on certain systems most notably, some Android and Windows Phone devices. We will make every effort to alert you about screenshots taken in your Secret Chats, but it may still be possible to bypass such notifications and take screenshots silently.
We advise to share sensitive information only with people you trust. After all, nobody can stop a person from taking a picture of their screen with a different device or an old school camera. When a secret chat is created, the participating devices exchange encryption keys using the so-called Diffie-Hellman key exchange. After the secure end-to-end connection has been established, we generate a picture that visualizes the encryption key for your chat.
You can then compare this image with the one your friend has — if the two images are the same, you can be sure that the secret chat is secure, and no man-in-the-middle attack can succeed. Newer versions of Telegram apps will show a larger picture along with a textual representation of the key this is not the key itself, of course! Always compare visualizations using a channel that is known to be secure — it's safest if you do this in person, in an offline meeting with the conversation partner.
All Telegram messages are always securely encrypted.
This enables your cloud messages to be both secure and immediately accessible from any of your devices — even if you lose your device altogether. The problem of restoring access to your chat history on a newly connected device e. At the same time, reliable backups are an essential feature for any mass-market messenger. To solve this problem, some applications like Whatsapp and Viber allow decryptable backups that put their users' privacy at risk — even if they do not enable backups themselves. Other apps ignore the need for backups altogether and fade into oblivion before ever reaching a million users.
We opted for a third approach by offering two distinct types of chats. Telegram disables default system backups and provides all users with an integrated security-focused backup solution in the form of Cloud Chats. Meanwhile, the separate entity of Secret Chats gives you full control over the data you do not want to be stored. This allows Telegram to be widely adopted in broad circles, not just by activists and dissidents, so that the simple fact of using Telegram does not mark users as targets for heightened surveillance in certain countries.
We are convinced that the separation of conversations into Cloud and Secret chats represents the most secure solution currently possible for a massively popular messaging application. On Telegram, you can send messages in private chats and groups without making your phone number visible. By default, your number is only visible to people who you've added to your address book as contacts. Note that people will always see your number if they know it already and saved it in their address book. Each phone number is a separate account on Telegram. You have several options if you are using multiple phone numbers:.
If you log out, you will keep all your cloud messages. However, you will lose all your Secret Chats and all messages inside those secret chats when you log out. You can change your number in Telegram and keep everything , including all your contacts, messages, and media from the Telegram cloud, as well as all your Secret Chats on all devices. If you already have a different Telegram account on the target number, you'll need to delete that account first. If you would like to delete your account, you can do this on the deactivation page.
Deleting your account permanently removes all your messages and contacts. All groups and channels that you've created are orphaned and left without a creator but admins retain their rights. We recommend using a non-mobile browser for this process. Note that you'll receive the code via Telegram , not SMS.
As was just mentioned above, all your data will be flushed from our system: all messages, groups, and contacts associated with your account will be deleted. That said, your contacts will still be able to chat in the groups that you have created, and they will still have their copy of the messages you sent them. So if you want to send messages that can vanish without a trace, try using our self-destruct timer instead. Termination of a Telegram account is irreversible. If you sign up again, you will appear as a new user and will not get your history, contacts or groups back.
People, who have your phone number in their contacts, will be notified. The new user will be displayed as a separate conversation in their messages list and their conversation history with this new user will be empty. Telegram is not a commercial organization, and we value our disk space greatly. If you stop using Telegram and don't come online for at least six months, your account will be deleted along with all messages, media, contacts and every other piece of data you store in the Telegram cloud.
You can change the exact period after which your inactive account will self-destruct in Settings. First of all, sorry about your phone. Unfortunately, the phone number is the only way for us to identify a Telegram user at the moment. Common thieves usually throw out the SIM card immediately the phone is harder to locate this way , then wipe the devices and sell them, so there isn't much risk for the data in case of regular petty theft. But if you have reasons to worry about the data on the device and are unable to log out the other device , it is best that you wipe it remotely.
You can read more about it here: Apple iOS , Android. Unfortunately, this requires you to have prepared in advance for this scenario. You can delete your Telegram account if you are logged in on at least one of your other devices mobile or desktop. Note that inactive Telegram accounts self-destruct automatically after a period of time — 6 months being the default setting. If you're a developer, you may find our Bots FAQ more useful. Bots are like small programs that run right inside Telegram. Creating Telegram bots is super-easy, but you will need at least some skills in computer programming.
Unfortunately, there are no out-of-the-box ways to create a working bot if you are not a developer. Bots are no different from human users that you meet in groups for example.
Naturally, any bot should be treated as a stranger — don't give them your passwords, Telegram codes or bank account numbers, even if they ask nicely. Also, be careful when opening files sent by bots, same as you would deal with ordinary humans. Example: If a bot sent us a file called OpenMe. Bots can work in two modes when you add them to groups. By default, bots only see messages that are meant for them. Some bots need more information to work, so developers may disable the privacy mode. While we have some official bots for specific purposes like gif or GDPRbot , we don't usually make bots.
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All code will be released eventually. We started with the most useful parts — a well-documented API that allows developers to build new Telegram apps, and open source clients that can be verified by security specialists. Our architecture does not support federation yet. Telegram is a unified cloud service, so creating forks where two users might end up on two different Telegram clouds is unacceptable. To enable you to run your own Telegram server while retaining both speed and security is a task in itself.
At the moment, we are undecided on whether or not Telegram should go in this direction. Developers for all platforms are welcome to use our protocol , API and even source code. Check out the Getting started section of the docs. Don't forget about our Bot API that lets you build cool stuff on our platform. Both apps are official. Both started out as unofficial applications by two different developers and vary in design and functionality.
Telegram Desktop is currently the more stable version. It is optimized for photo and document sharing, as well as sending long text messages. Telegram is officially available in English, Spanish, German, Dutch, Italian, French, Arabic, Portuguese, Korean, Malay, Russian and Ukrainian on most platforms, and we are gradually expanding the list of languages built into the apps. Everyone can suggest translations and vote for the best ones, making Telegram localization a community-driven effort.
If you're looking to go beyond suggestions for individual phrases and would like to help us maintain the official translation to your language on a continuous basis, you can contact TelegramAuditions. Please include a hashtag with the English name of your language e. Basic Group Processes suggests that research on groups is a lively enterprise and forging interesting new theoretical and empirical directions.
What is a group?
Minority Influence Pages Moscovici, Serge et al. Show next xx. Read this book on SpringerLink.