ChatBlocker
by alex1423.
ChatBlocker lets a player block other players so their messages vanish from chat, and it runs entirely on the client.
What it does
Blocked players disappear from the chat window without a trace, and the lines they occupied are left as blank space. Instead of removing those lines, the client can swap each message for a neat gray box; clicking the box reveals the hidden text one time. The Full Hiding Toggle and the Mod Sounds Toggle let a player choose between these display styles and turn click sounds on or off.
Blocking is handled by commands typed in chat: blockplayer adds a nickname to the list and unblockplayer removes it. The Interactive Player List shows every blocked player in a menu with a quick unblock cross beside each name. Because the commands and the settings menu run locally, the server never learns which players are blocked. The mod is aimed at anyone trying to stop spam, flooding or toxic chat on public servers. Fabric API is required, and the mod is released under the MIT License, but it is not open source.
Key features
Hidden blocked messages
Messages from blocked players are removed from view and leave no trace, including empty lines and spaces.
Gray placeholder boxes
Instead of disappearing, a message can be replaced with a gray box, and a click reveals its text once.
Interactive player list
A menu lists every blocked player with an unblock cross beside each name, so removal takes one click.
Local settings menu
Options for hiding style and sounds are set in a built-in menu, opened with the O key while in a world or on a server.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Use cases
Who it’s for: Players who join public or community servers and want to filter out individual players' chat on their own screen. Server owners do not need to install anything, because the server never learns which players are blocked.
How it compares
Personal Messages is a server-side only mod under the MIT License and is open source, with files for 1.21.1. MuteIt is a client-side only mod under the Apache License 2.0 that is not open source, published for 1.21.6 – 1.21.8. ChatDebug is client-side only under the MIT License, open source, and published for 1.21.5. ChatBlocker covers 1.21 – 1.21.4 and runs on the client alone, so it differs from the server-side Personal Messages in where it is installed.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| ChatBlocker | Fabric | 1.21 – 1.21.4 | Client-side only | 2026-08-12 |
| Personal Messages | Fabric | 1.21.1 | Server-side only | 2025-07-02 |
| MuteIt | Fabric | 1.21.6 – 1.21.8 | Client-side only | 2025-09-01 |
| ChatDebug | Fabric | 1.21.5 | Client-side only | 2025-04-21 |
Questions
Does ChatBlocker need Fabric API?
Does the server need ChatBlocker installed?
How is a player unblocked?
In the catalog
ChatBlocker is one of 29,952 Game mechanics mods on ModsFinder, and one of 19,630 Game mechanics mods for Fabric. 17,979 mods support Minecraft 1.21.4.
Similar mods
What the author says
ChatBlocker is a lightweight, fully client-side mod for Fabric (Minecraft 1.21–1.21.4), designed to permanently ban spam, flooding, and toxic players from your chat. The mod runs exclusively on your computer, meaning you can use it on absolutely any public server. The server won't even know you have the mod, and your…
Official listing
- Modrinth page
- modrinth.com/mod/chatblocker
- Owner
- alex1423.
- Published
- 2026-08-08
- Updated on Modrinth
- 2026-08-12
- Facts verified
- 2026-10-15