You can tell if someone blocked you on Snapchat by following these steps:

• Search for their username or full name: Open Snapchat, tap the search icon, and enter their username. If their profile does not appear at all, it could mean they blocked you or deleted their account

• Check your friends list: If you previously had them as a friend but they no longer appear in your friends list, this is a strong sign of being blocked

• Look at your chat history: If past conversations with them have disappeared from your chat list, or if you cannot find their chats anymore, they may have blocked you

• Try sending them a message: If you see an error like "Failed to send your message – Tap to try again," or the message status stays on "pending" for a long time, it suggests you are blocked or removed from their contacts

• Use another account or ask a friend: Search for their username from a different Snapchat account or ask a friend to search for them. If they appear on other accounts but not yours, you have likely been blocked

In summary, if you cannot find their profile by searching, they are missing from your friends and chat lists, and messages to them fail or remain pending, these are clear indicators that someone has blocked you on Snapchat. Confirming via another account can provide final verification