How do I install Sign Builder?

Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. Download the .jar. Put it in the .minecraft/mods folder and launch that loader profile. Opens on Modrinth — not every file is mirrored on our own servers.

What Minecraft version does Sign Builder work with?

The listing gives Minecraft 1.21.1. This is the version stated by the author or source site, not something we verified ourselves.

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Sign Builder

Java mod listed for Minecraft 1.21. Downloads from the MC Java Mods app on Android.

by BoranMandaci · on Modrinth

Build, paint, and automate custom 3D letters, numbers, symbols, and backplates with 40 dynamic materials, multi-blocks, and interactive Redstone.

⬇ Download on Modrinth

Open in MC Java Mods Get it on Google Play →

Quick facts

Edition: Minecraft Java
File type: .jar
Minecraft version listed: 1.21.1
How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.

Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.

File checked by MCModsHub

Ships as SignBuilder-1.21.1-neoforge-1.4.jar — drop this file into the mods folder
Download size: 1.3 MB
Download link checked 5 Oct 2026 — working

These come from our own check of the pack file, not from the source page.

Explore more

All Mods for Java All Minecraft Java mods Java mods for 1.21