You can block a contact on WhatsApp in under a minute, and they won't be notified

Open WhatsApp, find the person's name in your chats or contacts, tap and hold their name, then select "Block" from the menu. On iPhone, swipe left on their name instead. Once blocked, that person cannot message you, call you, or see when you're online. They won't receive a notification that you blocked them, but they will notice if they try to message you — your last seen time will stop updating for them, and their messages won't go through.

Blocking is different from deleting a chat. When you delete a conversation, the person can still reach you. When you block someone, they cannot. You can unblock them later if you change your mind, and the block takes effect when ready.

Key Takeaways

  • Blocking someone on WhatsApp prevents them from sending you messages, calling you, or seeing your online status, and takes effect when ready.
  • The blocked person will not receive a notification that you blocked them, but they will see that their messages are not being delivered.
  • You can block someone from your chat list, your contacts, or from within an active conversation with them.
  • Blocking does not delete your chat history with that person — it only stops new contact from reaching you.
  • You can unblock someone at any time through the same menu where you blocked them.

How to block someone from your chat list

The fastest way to block someone is from your main chat screen. Open WhatsApp and look at your list of conversations. Find the person you want to block, then tap and hold their name until a menu appears with options like "Mute", "Archive", and "Block".

On iPhone, swipe your finger from right to left across their name instead of tapping and holding. A red "Block" button will appear on the right side. Tap it to confirm. On Android, the tap-and-hold method works the same way.

How to block someone from your contacts

If you want to block someone before they message you, or if you don't have an active chat with them, you can block them from your contacts. Open WhatsApp, go to the "Contacts" tab at the top, find the person's name, and tap it to open their contact card.

Scroll down to the bottom of their contact card. You will see a "Block" option in red text. Tap it and confirm. This method works the same way on both iPhone and Android, though the exact location of the button may vary slightly depending on your WhatsApp version.

How to block someone during an active conversation

If you are already messaging with someone and decide you want to block them, you can do it without leaving the chat. Open the conversation, then tap the person's name at the top of the screen to open their contact details.

Scroll down and look for the "Block" option. On some versions of WhatsApp, this appears as a red button at the bottom of the screen. Tap it and confirm. The conversation will remain in your chat list, but no new messages from that person will come through.

What happens after you block someone

Once you block someone, they cannot send you messages, make calls to you, or see your profile picture, status updates, or last seen time. If they try to message you, they will see a single checkmark next to their message (meaning it was sent) but never a double checkmark (meaning it was delivered). This is often how people realize they have been blocked, even though WhatsApp does not send a notification.

Your chat history with the blocked person stays in your phone. You can still read old messages from them, but you cannot send new ones. If you want to delete the conversation entirely, you can do that separately — blocking and deleting are two different actions.

How to unblock someone

If you change your mind, you can unblock someone at any time. The process is the same as blocking: find their name in your chats or contacts, tap and hold (or swipe on iPhone), and select "Unblock" instead of "Block". Once you unblock them, they can message and call you again, and they will be able to see your online status and last seen time going forward.

Unblocking does not automatically restore your chat history or send them a notification. They straightforward regain the ability to reach you. If they try to message you while you are unblocking them, there may be a slight delay before those messages appear.

Why you might block someone instead of muting them

WhatsApp also has a "Mute" option, which silences notifications from someone without blocking them. Muting is useful if you want to stay in contact but don't want constant alerts. Blocking is the right choice if you do not want contact at all.

Muting someone means you still receive their messages and calls — you just don't get a notification sound or badge on the app. They can still see your online status and last seen time. Blocking cuts off all contact. Choose muting if you want to reduce noise from someone you know; choose blocking if you want to prevent someone from reaching you.

Frequently Asked Questions

Can someone tell if I blocked them on WhatsApp?

WhatsApp does not send a notification when you block someone, but they can figure it out. If they try to message you, they will see only one checkmark instead of two, which signals the message was not delivered. They may also notice your profile picture or status no longer loads. However, WhatsApp does not explicitly tell them "you have been blocked."

What if I block someone but they already have my number saved?

Blocking works the same way regardless of whether they have your number saved or not. They cannot message you or call you. If they try, the message will not be delivered and the call will not ring through. Blocking is based on your WhatsApp account, not on your phone's contact list.

Can I block someone without them seeing my last message?

No. If you have already sent them a message, they will see it before you block them. Blocking only stops new messages from reaching you going forward. It does not hide or delete messages you have already sent them.

Does blocking someone on WhatsApp also block them on other platforms?

No. Blocking on WhatsApp only affects WhatsApp. They can still reach you on Facebook, Instagram, email, text message, or any other platform. If you want to block someone across multiple services, you will need to block them separately on each one.

What if I accidentally blocked someone?

You can unblock them when ready by going to their contact, tapping and holding their name, and selecting "Unblock". There is no waiting period or confirmation required beyond tapping the unblock button. Once you unblock them, they can message and call you again right away.