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Sign BuilderMinecraft mod for 1.21.4

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

client and servernewest supported release 1.21.4TechnologyUtilityDecorationLibrary
Latest version
no release indexed
Minecraft
1.19.2 to 1.21.4
Java
Java 21+
Loaders
Fabric, NeoForge, Forge
Licence
GPL-3.0-only
Downloads
986
Updated
4 d ago
Available on
Modrinth
Space NodeOur hosting

Host Sign Builder servers

One click and Sign Builder is installed with the right loader, on hardware built for it.

  • 1.21.4
  • Fabric
  • NeoForge
  • Forge
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Screenshots

Click a screenshot to open it. Screenshots are served from the author’s own host and belong to them.

Minecraft versions

Every version Sign Builder declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.4Fabric, NeoForge, Forge21+declared3 Dec 2024
1.21.1Fabric, Forge, NeoForge21+declared8 Aug 2024
1.20.1Fabric, Forge, NeoForge17+declared12 Jun 2023
1.19.2Fabric, NeoForge, Forge17+declared5 Aug 2022

Frequently asked

Does Sign Builder work on Minecraft 1.21.4?

Yes. 1.21.4 is the newest Minecraft version Sign Builder declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Which Minecraft versions does Sign Builder support?

Everything the author has declared, from 1.19.2 up to 1.21.4. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install Sign Builder on the client or the server?

Both. Every player needs it installed and so does the server, so anyone joining without it will be refused.

Which platform or loader does Sign Builder support?

Fabric, NeoForge, Forge. A build for one platform or loader will not necessarily load on another, so this is the first thing to check before the Minecraft version.

Which Java version do I need for Sign Builder?

Among the supported Minecraft releases above, the highest recorded requirement is Java 21 or newer. Use the requirement for the exact Minecraft version you run; previews and snapshots may differ.

What licence is Sign Builder under?

GPL-3.0-only, as stated by the author on the platform we synced it from. Check the project's own page before redistributing or bundling it.

How do I install Sign Builder?

Install the matching loader first, then put the downloaded file in your mods folder and start the game. The loader, the mod and Minecraft all have to be on the same version, which is the usual reason a mod does not appear in game.

Where do I download Sign Builder safely?

MCReference has no release file or checksum recorded for Sign Builder. Check the publisher's Modrinth listing for current downloads and verify the publisher before installing.

Works on the same versions

Ordered by how much of the recent Minecraft version coverage overlaps, not by popularity.

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Details from Modrinth, where the author last updated it on 24 Oct 2026. We do not host files or republish descriptions. Available download links point to the author’s own release.

Is this information wrong or missing something? .