The quickest way to block someone on Messenger
Open the conversation with the person you want to block. Tap or click their name at the top of the chat window. Scroll down to find the "Block" option and select it. Facebook will ask you to confirm — select "Block [Name]" again. That person can no longer message you, see when you're online, or find your profile in search results.
The block takes effect when ready. Any messages they try to send bounce back with a notification that the message couldn't be delivered. If you change your mind later, you can unblock them the same way: go to Settings, select "Blocked people," find their name, and choose "Unblock."
On mobile, the process is nearly identical. Open the conversation, tap their name at the top, scroll to "Block," and confirm. On desktop, the steps are the same — the button location doesn't change between devices.
Key Takeaways
- Blocking someone on Messenger prevents them from sending you messages, seeing your online status, or finding your profile in search.
- The block happens when ready when you confirm it, and the other person receives no notification that you blocked them.
- You can unblock someone at any time through Settings > Blocked people, which restores their ability to message you.
- Blocking on Messenger is separate from blocking on Facebook itself — you may need to block them in both places if you want to restrict their access completely.
What happens when you block someone
When you block someone on Messenger, they lose several abilities at once. They cannot send you new messages. They cannot see whether you're currently online or when you were last active. They cannot call you through Messenger. They cannot add you to group chats or see any group conversations you're both part of.
The blocked person does not receive a notification saying you blocked them. However, they may figure it out if they try to message you and see an error, or if they notice they can no longer see your profile. Facebook does not send a message saying "You've been blocked."
Old messages between you and the blocked person remain in your chat history, but they cannot see the conversation on their end. If you had a group chat together, the blocked person can still see the group and the messages in it — blocking only affects one-on-one contact.
Blocking versus other privacy controls on Messenger
Messenger offers several privacy tools beyond blocking, and they work differently. Muting a conversation silences notifications from that person but does not prevent them from messaging you or seeing your status. You can still see their messages — they just won't ping your phone. Muting is useful if someone messages you frequently but you don't want to cut off contact entirely.
Restricting someone is a middle ground. A restricted person's messages go to a separate folder, and they cannot see when you're online or whether you've read their messages. They can still send messages, but you control whether you see them. Restricting is gentler than blocking and doesn't alert the person the way a failed message might.
Blocking on Facebook itself is separate from blocking on Messenger. If you block someone on Facebook, they also cannot message you on Messenger — but blocking only on Messenger does not block them on Facebook. If you want to prevent someone from contacting you and seeing your profile everywhere, you may need to block them in both places.
When blocking doesn't fully stop contact
Blocking on Messenger stops direct messages, but it has limits. If you're both in a group chat, the blocked person can still see your messages in that group and respond to them — the block only applies to one-on-one conversations. If you want to prevent them from seeing your group messages too, you would need to leave the group or remove them from it.
A blocked person can still see your public Facebook profile and any posts you've set to public. Blocking Messenger does not hide your profile or your posts — it only stops direct contact. If you want to hide your profile from someone, you need to block them on Facebook itself, not just on Messenger.
If someone creates a new account, they can message you again even if you blocked their original account. Blocking is tied to a specific account, not to a person. If you're being harassed by someone who keeps making new accounts, you may want to change your Messenger settings to allow messages only from people you know.
How to change who can message you on Messenger
If you're receiving unwanted messages from multiple people or strangers, you can restrict who can contact you in the first place. Open Messenger, tap your profile picture in the top left, select "Privacy," and look for "Who can message you." You can choose "Everyone," "Friends only," or "Friends of friends."
If you set it to "Friends only," messages from non-friends go to a separate "Message Requests" folder. You can read them without responding, and the sender won't know you've seen the message. This is less disruptive than blocking individual people if the problem is ongoing harassment from strangers.
You can also turn off message notifications entirely for specific conversations without blocking. Open the conversation, tap the person's name, and select "Mute notifications." They can still message you, but you won't get alerts.
Unblocking someone and what to expect
To unblock someone, go to Settings in Messenger, select "Blocked people," find the person's name, and tap "Unblock." Once you unblock them, they can message you again and see your online status. However, unblocking does not restore old messages they sent while blocked — those remain hidden from them.
Unblocking someone does not notify them that you've unblocked them. They won't know unless they try to message you and the message goes through, or unless you tell them directly. If they message you after you unblock them, the conversation starts fresh.
If you unblock someone and then want to block them again, you can do so when ready. There's no waiting period or limit on how many times you can block and unblock the same person.
Blocking on mobile versus desktop
The blocking process is the same on iPhone, Android, and desktop, but the exact button locations differ slightly. On mobile, open the conversation and tap the person's name at the top — the block option appears near the bottom of their profile card. On desktop, click their name at the top of the chat, and the block button appears in a menu on the right side.
If you block someone on mobile, the block applies across all devices. You don't need to block them separately on desktop. The same account-level block works everywhere you're signed in.
Frequently Asked Questions
Does the person know I blocked them?
Facebook does not send a notification when you block someone. However, they may realize it if they try to message you and see an error, or if they notice they can no longer see your profile or online status. There's no automatic alert.
Can I block someone without them seeing my last message?
No. If you've already sent a message, they can see it before you block them. Blocking only stops future messages. If you want to hide a message you've already sent, you would need to delete it before blocking — but even then, they may have already read it.
What if I block someone by accident?
You can unblock them when ready through Settings > Blocked people. Once unblocked, they can message you again. Unblocking doesn't notify them, so you can unblock and re-block without them knowing, though doing so repeatedly may look suspicious if they try to message you.
Can I block someone from a group chat?
Blocking someone removes them from one-on-one contact, but they can still see and message in group chats you're both part of. If you want to remove them from a specific group, you need to remove them from that group separately — blocking doesn't do that automatically.
If I block someone on Facebook, are they blocked on Messenger too?
Yes. Blocking someone on Facebook also blocks them on Messenger. However, blocking only on Messenger does not block them on Facebook — they can still see your profile and posts. If you want to block them everywhere, block them on Facebook itself.