Facebook owned by WhatsApp to check this Indicator Have determined if someone has blocked you on the messaging app. However, keep in mind that these indicators do not guarantee that you definitely get confirmed that a contact has blocked you.
How to find out if you have been blocked on whatsapp
Checking Last Seen/ Online Status is one of the easiest ways to check. Check their last scene or online situation in chat window. You may not see the last scene because this setting may also have been disabled by the user.
Checking for profile photo
If a person has blocked you on WhatsApp, you will not be able to see their profile picture. However, if you are able to see that person's profile picture and meanwhile you have been blocked, then you may not be able to see the updated profile photo of that user.
Sending a message to the contact
If you send a message to the contact that has blocked you, then you will see only a tick mark after sending the message. You will not see double tick mark and blue tickmarks.
Calling the contact
Efforts to call the contact may not be successful. You will only see a calling message when you are calling. However, this can also happen when the receiver does not have an internet connection.
Creating a group on whatsapp
If you try to form a group with any contact that you suspect that it has blocked you, then only you will come to that group when you go through the group forming the group.