Cubes Without Borders Mod (1.21.11) – Borderless Fullscreen Window

Cubes Without Borders is a utility mod that allows you to play Minecraft in a borderless fullscreen window, available for Fabric, Forge, NeoForge, and Quilt mod loaders. Instead of the standard fullscreen mode that minimizes your game when you click on another monitor, this mod keeps Minecraft running seamlessly in the background while you interact with other applications.

Every Minecraft player who uses a dual-monitor setup knows the frustration: you go fullscreen for the best visual experience, then click on your second screen to check Discord or a wiki page, and the game instantly minimizes. You're left staring at your desktop, waiting for Minecraft to restore itself. Cubes Without Borders solves this problem by turning Minecraft's fullscreen into a borderless window that sits perfectly on your screen without hijacking your entire display. With over 16.7 million downloads on Modrinth alone, it has become one of the most popular quality-of-life mods in the Minecraft ecosystem — and for good reason. Developed by Kira-NT, this lightweight utility has earned the trust of millions of players across every major platform and mod loader.

Key Features of Cubes Without Borders

• True Borderless Fullscreen Mode — The core feature adds a third display option alongside Windowed and Fullscreen in your Video Settings. Selecting "Borderless" gives you the visual benefit of fullscreen without the annoying minimize-on-click behavior. This means you can glance at your second monitor, respond to a message, or look up crafting recipes without your game collapsing.
• Cross-Platform Support (Windows, macOS, Linux) — Unlike many competing mods that only work reliably on Windows, Cubes Without Borders explicitly supports all three major operating systems. The developer has addressed platform-specific issues like screen flickering on Linux compositors and macOS fullscreen quirks, so the experience is smooth regardless of your OS.
• No Screen Flickering or Compositing Glitches — Switching between fullscreen and windowed modes in vanilla Minecraft often causes brief screen flickers or resolution hiccups. Cubes Without Borders eliminates these visual artifacts by handling the window state natively on each platform. The transition is clean, and your display never struggles to re-render.
• Resolution Control Preserved — Some borderless fullscreen solutions force your game to run at your native monitor resolution with no way to change it. This mod retains the ability to adjust your game resolution, and on platforms where the resolution setting is unavailable (macOS, Linux), it introduces software scaling as an alternative so you always have control over your visual output.
• Sodium Compatibility — If you run Sodium for performance optimization, Cubes Without Borders integrates directly with it. The borderless option appears in Sodium's modified Video Settings screen, and the mod supports Sodium 0.6.0-beta and newer. You don't have to choose between performance and convenience.
• Configuration Screen via Cloth Config — When paired with the Cloth Config API, the mod provides a dedicated settings screen where you can toggle options like "Pause On Lost Focus." This gives you granular control over how the game behaves when you switch to another window — perfect for players who want the game to keep running while they multitask.
• Startup Flag Support — For power users and server administrators, the mod adds a --borderless launch flag that works identically to Minecraft's built-in --fullscreen flag. This lets you force borderless mode from your launcher profile or script without touching in-game settings.

Screenshots

How to Install Cubes Without Borders

1. Install your preferred mod loader: Fabric, Forge, NeoForge, or Quilt. Make sure the loader version matches your Minecraft version.
2. Download the correct version of Cubes Without Borders for your Minecraft version and mod loader from the download section below.
3. Place the downloaded .jar file into your .minecraft/mods folder. If the folder doesn't exist, launch Minecraft once with your mod loader to generate it.
4. (Optional) Install Cloth Config API if you want access to the in-game configuration screen for additional settings like "Pause On Lost Focus."
5. Launch Minecraft, go to Options → Video Settings, and switch the fullscreen toggle to the new "Borderless" option.

Requirements & Compatibility

What's New

• Added NeoForge support, expanding loader compatibility beyond Fabric and Quilt.
• Full compatibility with Sodium 0.6.0-beta, ensuring the borderless option appears correctly in Sodium's video settings.
• New in-game configuration screen (requires Cloth Config API) with easy access to the "Pause On Lost Focus" toggle.
• Introduced software scaling as a replacement for the resolution setting on platforms where it is unavailable, such as macOS and Linux.
• Enhanced macOS fullscreen handling to better align with expected borderless behavior and reduce compositing issues.

Pros and Cons

Alternatives to Cubes Without Borders

• Borderless Mining — A Fabric-focused borderless fullscreen mod that was one of the earliest solutions for this problem. It covers the basics but lacks the cross-platform polish and multi-loader support of Cubes Without Borders.
• Sodium — While primarily a performance optimization mod, Sodium pairs perfectly with Cubes Without Borders for players who want both smooth framerates and borderless fullscreen in a single setup.
• Custom Window Title — A complementary utility mod that lets you customize the Minecraft window title bar text and icon, useful for players who run multiple instances and want to tell them apart at a glance.

Download Cubes Without Borders

Always download mods from official sources to stay safe.

Frequently Asked Questions

Does Cubes Without Borders work with Sodium?

Yes — Cubes Without Borders has explicit Sodium support, including compatibility with Sodium 0.6.0-beta and newer. The borderless fullscreen option will appear directly in Sodium's modified Video Settings screen, so you don't need to change any workflow.

Does this mod affect game performance or FPS?

No noticeable performance impact has been reported. The mod changes how the window is displayed by your operating system rather than modifying rendering internals, so it appears to be lightweight. Your FPS should remain the same as in standard fullscreen mode.

Can I use Cubes Without Borders on Linux or macOS?

Yes — full cross-platform support is one of this mod's defining strengths. The developer has specifically addressed Linux compositing glitches and macOS fullscreen quirks that affect other borderless mods, so the experience is reliable on all three operating systems.

Do I need Cloth Config API to use this mod?

No — Cloth Config API is entirely optional. Without it, you can still enable borderless fullscreen through the Video Settings menu. Installing Cloth Config only adds a dedicated configuration screen with extra options like "Pause On Lost Focus."

Is Cubes Without Borders available for Forge?

Yes, but with limited version support. Forge builds are available for Minecraft 1.21.4 and some earlier versions. For newer Minecraft versions like 1.21.5+, the mod supports NeoForge instead, which is the successor to Forge. Check the download table above for exact loader availability per version.

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