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plugin

SealLibMinecraft plugin for 1.21.11

A library for all of ISeal's plugins!

server onlynewest supported release 1.21.11Game MechanicsLibraryManagement
Latest version
1.2.0.1
Minecraft
1.19.4 to 1.21.11
Java
Java 21+
Platforms
Spigot, Paper
Licence
CC-BY-SA-4.0
Downloads
68.7k
Updated
14 mo ago
Available on
Modrinth
Space NodeOur hosting

Host SealLib servers

One click and SealLib is installed on a Paper or Purpur server built for it.

  • 1.21.11
  • Spigot
  • Paper
  • One click plugin install
  • Paper and Purpur ready
  • Automatic updates
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Minecraft versions

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

Other plugins
MinecraftThroughJavaEvidenceReleased
1.21.11Spigot, Paper21+declared9 Dec 2025
1.21.10Spigot, Paper21+declared7 Oct 2025
1.21.9Paper, Spigot21+declared30 Sept 2025
1.21.8Spigot, Paper21+declared17 Jul 2025
1.21.7Spigot, Paper21+declared30 Jun 2025
1.21.6Spigot, Paper21+declared17 Jun 2025
1.21.5Spigot, Paper21+declared25 Mar 2025
1.21.4Spigot, Paper21+declared3 Dec 2024
1.21.3Spigot, Paper21+declared23 Oct 2024
1.21.2Paper, Spigot21+declared22 Oct 2024
1.21.1Spigot, Paper21+declared8 Aug 2024
1.21Spigot, Paper21+declared13 Jun 2024
1.20.6Paper, Spigot21+declared29 Apr 2024
1.20.5Spigot, Paper21+declared23 Apr 2024
1.20.4Paper, Spigot17+declared7 Dec 2023
1.20.3Spigot, Paper17+declared4 Dec 2023
1.20.2Spigot, Paper17+declared20 Sept 2023
1.20.1Paper, Spigot17+declared12 Jun 2023
1.20Spigot, Paper17+declared2 Jun 2023
1.19.4Spigot, Paper17+declared14 Mar 2023

Download

From SealLib’s own host. Nothing is re-hosted here.

For Minecraft 1.21.11

Choose the loader you use before downloading.

Most recently published release

1.2.0.1release5 Sept 2025

SealLib-1.2.0.1.jar · 0.9 MB · for 1.21.11, 1.21.10, 1.21.9, 1.21.8, 1.21.7 +15 more · Paper, Spigot

Choose file on publisher ↗
48b2600b6afa…
Older versions11

Frequently asked

Does SealLib work on Minecraft 1.21.11?

Yes. 1.21.11 is the newest Minecraft version SealLib 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 SealLib support?

Everything the author has declared, from 1.19.4 up to 1.21.11. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install SealLib on the client or the server?

The server only. Players join with an ordinary Minecraft client and install nothing.

Which platform or loader does SealLib support?

Spigot, Paper. 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 SealLib?

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 SealLib under?

CC-BY-SA-4.0, 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 SealLib?

Choose the release variant for your server platform. Paper, Spigot, Purpur and Bukkit files go in the server's plugins folder; Fabric, Forge, NeoForge and Quilt files go in the mods folder. Restart after installing and check that the Minecraft version matches your server.

Where do I download SealLib safely?

Start with the author's page on Modrinth, which is where the data here is synced from. MCReference does not host or repackage files. When available, recorded download links go to the source for that release; verify the publisher, filename and any available checksum before running it.

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 5 Sept 2025. 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? .