While it is useful knowing how to block someone on Snapchat, you may perhaps worry about the other person knowing that you have blocked them.
Snapchat by default doesn’t send any sort of message actively telling the other person who you have blocked that they have been blocked by you, the only way the blocked person can know that you they have been blocked by you is when they are unable to find your profile picture no matter what they do.
Also, you will disappear from their contact list, letting it be even more obvious that they might have been blocked by you. But otherwise the telltale signs, Snapchat does not inform the user that they have been blocked.
If the person you are looking to block is not on your friend, you can do the following steps below to know how to block someone on Snapchat without adding them: