Limn - Colored Block Outlines
Every Minecraft player knows the thin black box that appears when you aim at a block. It is functional, but it never changes. Limn - Colored Block Outlines throws that vanilla look out the window and replaces it with something you actually control. Whether you want a soft teal glow, a rainbow that flows along the edges, or an outline that warns you as a block is about to break, this client-side mod delivers it without touching the server.
What Limn - Colored Block Outlines Actually Does
Limn is a small visual mod that redraws the selection box around whatever block you are looking at. It is purely cosmetic, meaning it changes how the outline is drawn, not what you can target or reach. Nothing needs to be installed on the server, so you can use it on any world or multiplayer server you like.
The mod ships with four outline styles:
- Solid Color - pick any color and opacity using the RGB sliders for a clean, consistent highlight.
- Rainbow - the outline cycles through every hue and flows along the edges for a constantly shifting look.
- Chase - a bright band of your chosen color sweeps across a dimmer outline, adding motion to every block you look at.
- Mining Progress - the outline starts in your color and fades to red as the block breaks, so you can gauge progress without staring at the cracks.
Opacity works in every style, so you can make the outline as bold or as subtle as you want. Animation Speed and Spread control how fast Rainbow and Chase move and how much they change across a single block. Line Width lets you push the outline from 0.5x to 4x the vanilla thickness, though this slider only works on Minecraft 1.21.11 and newer, since older versions of the game cannot draw the outline at any other thickness.
Supported Versions and Loaders
Limn - Colored Block Outlines for Minecraft covers a wide range of setups across three loaders:
- Fabric - Minecraft 1.18.2, 1.19.2, and 1.20 through 26.3
- NeoForge - Minecraft 1.21 through 26.3
- Forge - Minecraft 1.16.5, 1.18.2, 1.19.2, and 1.20.1
Because it is client-side only, the mod works fine on servers where nobody else has it installed. Your friends will never know you are running a custom outline unless you tell them.
How to Install Limn - Colored Block Outlines
Fabric Installation
Drop Fabric API and the Fabric build of the Limn jar for your game version into your mods folder. Adding Mod Menu is optional but recommended, since it gives you a proper settings screen under Mods > Limn > Configure. Without Mod Menu, you will need to edit config/limn.json manually and restart the game.
NeoForge and Forge Installation
Place the Limn jar that matches your loader and Minecraft version into the mods folder. No other mods are required. The settings screen appears under Mods > Limn > Config, and every change applies immediately and saves when you close the screen.
If you would rather skip the manual file shuffling, the foxygame.net launcher handles the whole process in a single click, pulling Limn - Colored Block Outlines straight from its built-in add-on catalog and keeping it updated whenever a new build drops.
Settings Worth Tweaking
The configuration screen is refreshingly simple. Enabled toggles the custom outline on or off. Outline Style switches between the four looks. The Red, Green, and Blue sliders set your base color, which defaults to a pleasant teal and is ignored by Rainbow. Animation Speed runs from 0.1 to 5, while Animation Spread ranges from 0 to 3. A Reset to Defaults button puts everything back if you experiment too far.
One detail worth noting: the mod is MIT licensed and open source, with bug reports and suggestions welcome on its issue tracker. If a particular color combination or animation speed feels off, the developer is genuinely open to feedback.
Final Thoughts
Limn - Colored Block Outlines is the kind of mod you install once and wonder how you played without. It is lightweight, server-friendly, and packed with just enough customization to make mining, building, and exploring feel fresher. If you want to download Limn - Colored Block Outlines, grab the build for your loader and version, drop it in your mods folder, and start experimenting with colors.