Block Outline Customizer
by Anomz
Block Outline Customizer lets players change the color, opacity and width of the outline drawn around the block they are looking at.
What it does
Vanilla draws a plain black selection outline around the block under the crosshair. With this mod installed, that outline can be recolored using red, green and blue values from 0 to 255 for each channel. An RGB mode cycles the outline through shifting colors at a speed the player sets, and the opacity can be adjusted from fully transparent to fully opaque. The width can also be set, from thin to thick, so the outline stands out more or less.
The mod is a client-side only utility, so the server does not need it and its settings do not change server gameplay. Players can use it in single-player worlds and on multiplayer servers alike. Changes apply immediately, and the chosen preferences are saved automatically, so they carry over between sessions.
Installation requires NeoForge on NeoForge and Fabric on Fabric; the Forge loader is supported as well. Builds cover game versions 1.20.1 – 26.3, with 13 release versions published under the MIT License, which makes the code open source. Source code and an issue tracker are publicly linked for anyone who wants to report problems.
Key features
Custom RGB colors
Each outline channel is set from 0 to 255, so any red, green and blue combination can be chosen for the selection box.
Color-shifting RGB mode
An RGB mode moves the outline through a rainbow of colors continuously, with a speed the player can adjust.
Adjustable opacity
The outline can be made transparent, fully opaque or anywhere between, set with a single slider value.
Gallery
Compatibility
Latest build for each game version and loader.
26.x5 of 5 versions with builds
1.21.x6 of 6 versions with builds
1.20.x2 of 2 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Players who want a more readable or more personal block selection outline in Minecraft Java Edition. The mod is installed by players alone, since its settings affect only the local client.
How it compares
Blocky Outline is open source under the Apache License 2.0, client-side only, and published for Fabric and Forge across 1.19 – 26.2. Remove Block Outline is a Fabric client-side only mod for 1.21.11 under All rights reserved, so it is not open source. Color Me Outlines is client-side only under the MIT License, open source, and published for Fabric across 1.19 – 1.20.1, a range that ends before the versions this mod covers.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Block Outline Customizer | Fabric, Forge and NeoForge | 1.20.1 – 26.3 | Client-side only | 2026-10-03 |
| Blocky Outline | Fabric and Forge | 1.19 – 26.2 | Client-side only | 2026-09-22 |
| Remove Block Outline | Fabric | 1.21.11 | Client-side only | 2026-02-13 |
| Color Me Outlines | Fabric | 1.19 – 1.20.1 | Client-side only | 2023-06-17 |
Questions
Does Block Outline Customizer need to be on the server?
Which loader should be used with Block Outline Customizer?
Are the settings saved between game sessions?
In the catalog
Block Outline Customizer is one of 36,990 Utility mods on ModsFinder, and one of 25,772 Utility mods for Fabric. 8,071 mods support Minecraft 26.3.
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What the author says
Tired of the plain black selection outline in Minecraft? Block Outline Customizer lets you personalize it with custom colors, RGB mode, adjustable transparency, and variable thickness! Q: Does this work in multiplayer? A: Yes! Settings are client-side only and don't affect server gameplay.
Official listing
- Modrinth page
- modrinth.com/mod/block-outline-customizer
- Owner
- Anomz
- Published
- 2026-06-19
- Updated on Modrinth
- 2026-10-03
- Facts verified
- 2026-10-15