Will the other person see if I block them in WhatsApp - briefly?
If you block someone on WhatsApp, they will not be able to see your last seen or online status, nor any changes made to your profile photo. However, the blocked person will still see messages sent prior to being blocked and any group chats you both are part of will remain visible to them until they leave the group.
Will the other person see if I block them in WhatsApp - in detail?
When you block someone on WhatsApp, there are several aspects to consider regarding what the other person will see or experience.
Firstly, blocking a contact on WhatsApp will prevent that person from seeing your profile picture, status updates, and any changes in your "Last Seen" or "Online" status. This means they won't be able to tell if you are active on the app or when you were last online.
Secondly, the other person will not receive any notifications or messages indicating that they have been blocked. WhatsApp does not send a confirmation or alert to users who have been blocked. However, there are some indirect signs that might clue them in: if they try to call you, the call will not go through, and they will see a message saying "You can't make this call." Similarly, messages sent to you will show only one checkmark (indicating that the message was sent but not delivered), rather than two checkmarks which would indicate delivery.
Thirdly, if the blocked user tries to view your profile or status, they will find that these features are unavailable. They won't be able to see any updates or changes you make to your profile picture or status. This can also serve as an indirect clue that they have been blocked, especially if they were previously able to see these details.
Lastly, it is important to note that blocking someone on WhatsApp does not delete the conversation history from either party's device. The messages and media shared before the block will still be visible in both users' chat logs. However, any new messages sent by the blocked user after they have been blocked will not be delivered or seen by you.
In summary, while blocking someone on WhatsApp does provide a level of privacy and control over your interactions, it is not entirely invisible to the other person. They may notice certain changes or limitations in their ability to contact or view information about you, which could indicate that they have been blocked.