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Telegram and Signal are widely popular privacy-focused messaging apps. However, the two apps have some big differences: While all messages sent via Signal are always end-to-end encrypted by default, Telegram messages arent. End-to-end encryption is an optional feature in Telegram.

End-to-end encryption means that only the sender and the receiver of a message can see its contents. Not even the company running the server in the middle of the conversations can see the contents of the communications.

With Signal, all conversations are always end-to-end encrypted: The Signal Foundation cant see the contents of the messages.

With Telegram, the company in charge of Telegram is technically capable of seeing the contents of the messages on its servers.

There is still some encryption in Telegram, of course: Encryption is used to transmit messages between your Telegram app, Telegrams servers, and the other persons Telegram app. Your internet service provider, network operator, and any third parties snooping on your internet activity cant see the contents of your communications. (Thats a big improvement from traditional SMS, which lets your cellular provider see all your messages!)

If Telegrams servers were hacked at some point in the future, for example, the attackers could see the contents of peoples Telegram conversations. However, if Signals servers were hacked, the attackers couldnt see the conversations.

Telegram and Signal are very different in this way. Telegram is much more of a traditional messaging application. It syncs your chats between your devices and stores them in the cloud. If you dont care about end-to-end encryption, thats fineand Telegrams features can definitely be convenient.

But if you are sending sensitive informationor if you just want to ensure that your conversations arent being snooped onyou should use end-to-end encryption.

You dont have to switch to Signal to use end-to-end encryption. Its built right into Telegram. Its just an optional feature that most people arent aware of.

In Telegram, only secret chats are encrypted. To use Telegrams end-to-end encryption, you have to start a secret chat by tapping the persons name, the More or menu button, and Start Secret Chat.

Secret chats appear separately from non-secret chats in Telegrams chat list. For secret chats, Telegram shows the persons name in green next to a green padlock icon. If youre already talking to someone, youll see two separate conversations in your list.

In a secret chat, you can also enable a self-destruct timer for messages, ensuring that theyll be deleted after a given amount of time. (Of course, the person youre talking to can always take a screenshot of your conversation to preserve it if they want to.)

RELATED: How to Start an Encrypted Secret Chat in Telegram

Because of the end-to-end encryption, secret chats dont sync between the Telegram app on multiple devices. A secret chat on one device stays on that device. So if you start a secret chat on your phone, you cant continue that same secret chat on a tablet or computer. It stays on your phone.

Signal was designed from the ground up for end-to-end encryption, so it can optionally sync end-to-end encryption between your devices. Signal lets you link the app on your phone to another device like a Windows PC, Mac, or iPad. You can carry on your conversations between multiple devices without sacrificing end-to-end encryption, as you would have to do with Telegram.

Telegram offers huge group chats with up to 200,000 people in a channel. However, in Telegram, only one-on-one conversations can be end-to-end encrypted with the secret chats feature.

Signal only supports up to 1000 people in a group chat.However, those group chats are always end-to-end encrypted. If you want end-to-end encrypted group chats with three or more people, Signal is the app to choose.

In other words, Telegrams group chats are ideal for big public channels with thousands of people, while Signals group chat feature is ideal for private conversations with a smaller number of people.

Telegram is undoubtedly a polished messaging app with a slick interface. Its great that it offers the option to have a secret chat with end-to-end encryption, too.

However, if you really care about end-to-end encryption, you should use Signal instead. In Signal, encryption isnt an optional featureits built into every single conversation that you have. All of Signals featuresincluding message sync between devices and group chatswork with end-to-end encryption.

That ease of use is very helpful for getting people on board with secure, private chats. If you want to have end-to-end encrypted conversations with your friends, family members, or coworkers, its much easier for them to use Signal. The end-to-end encryption just works in all conversations, and you wont have to explain the difference between secret chats and non-secret chats to them, as you would with Telegram.

So which is better, Signal or Telegram? Well, theyre different. As of the start of 2021, Telegram clearly has a shinier, more polished interface, with prettier stickers and chat backgrounds. Its also ideal for big public channels, making it almost a sort of social network.

However, if youre looking for end-to-end encryption so that the company operating the chat app cant see your messages (and they cant be accessed by hackers who breach the companys servers), Signal is the best option.

Thankfully, Telegram at least offers end-to-end encryption as an option. If you ever need to transmit sensitive information (say, financial details), you can switch over to a secret chat for that.

RELATED: Signal vs. Telegram: Which Is the Best Chat App?

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PSA: Telegram Chats Arent End-to-End Encrypted by Default - How-To Geek