Cubium
by HenriTom
Cubium puts a Chromium-based web browser inside the Minecraft window, so players can open websites without tabbing out of the game.
What it does
Pressing B opens the browser by default, and the key can be changed in the settings. Pages load in a window that stays inside the game, with search, a customizable search engine choice and file saving that works without leaving Minecraft. The browser is built to behave like a regular browser, so its controls will be familiar to most players.
Cubium works in singleplayer and multiplayer, but it is a client-side mod, so only the player's installation needs it and servers do not have to run it. It uses the MCEF library to embed Chromium, which means MCEF has to be installed alongside it. Fabric API and Fabric Language Kotlin are required as well, and Cubium is published for Fabric across 1.21.1 – 1.21.4, with the latest file, 1.1.3, for 1.21.1. It is released under the GNU Lesser General Public License v3.0 or later and is open source.
Key features
In-game browser
Websites open inside the game window, so browsing does not require switching to another application.
Picture-in-picture mode
The browser can be detached into a floating, movable window that stays on screen while the player plays.
Minimizable window
The browser can be minimized while its audio keeps playing in the background.
Saving files
Files can be saved straight from a page in the browser without leaving the game.
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 3
Optional 1
How it compares
InGameWeb is a Fabric client mod for 1.21.11 under the MIT License and is not open source. Modrinth Direct is client-side only, open source under the MIT License and published for 1.21.1 – 1.21.11, which overlaps with Cubium's range. Web Window Mod is client-side only, not open source, and covers 1.21.1 – 1.21.11 under the MIT License.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Cubium | Fabric | 1.21.1 – 1.21.4 | Client-side only | 2025-10-31 |
| InGameWeb | Fabric | 1.21.11 | Client-side only | 2026-05-21 |
| Modrinth Direct | Fabric | 1.21.1 – 1.21.11 | Client-side only | 2026-07-31 |
| Web Window Mod | Fabric | 1.21.1 – 1.21.11 | Client-side only | 2026-10-04 |
Questions
Does Cubium need MCEF to run?
Does a server need Cubium installed?
Can Cubium be used with Quilt?
In the catalog
Cubium is one of 36,990 Utility mods on ModsFinder, and one of 25,772 Utility mods for Fabric. 17,979 mods support Minecraft 1.21.4.
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What the author says
Cubium is a client-side Minecraft mod that integrates a Chromium-based browser directly into the game. With Cubium, you can browse the web seamlessly without ever needing to tab out. The browser can be opened at any time using the B key (default, customizable in settings). Cubium uses the MCEF library. Make sure to…
Official listing
- Modrinth page
- modrinth.com/mod/cubium
- Owner
- HenriTom
- Published
- 2025-02-06
- Updated on Modrinth
- 2025-10-31
- Facts verified
- 2026-10-15