Menu

mod

Open LoaderMinecraft mod for 1.21.1

An open source resource and data loader for Minecraft.

client and servernewest supported release 1.21.1UtilityLibrary
Latest version
19.0.5
Minecraft
1.14.4 to 1.21.1
Java
Java 21+
Loaders
Fabric, Quilt, NeoForge, Forge
Licence
LGPL-2.1-only
Downloads
6.1M
Updated
9 mo ago
Available on
Modrinth
Space NodeOur hosting

Host Open Loader servers

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

  • 1.21.1
  • Fabric
  • Quilt
  • NeoForge
  • Forge
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Minecraft versions

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

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.1Fabric, Quilt, NeoForge, Forge21+declared8 Aug 2024
1.20.4Forge, Quilt, NeoForge, Fabric17+declared7 Dec 2023
1.20.3Forge, Quilt, NeoForge, Fabric17+declared4 Dec 2023
1.20.2Forge, Quilt, NeoForge, Fabric17+declared20 Sept 2023
1.20.1Forge, Quilt, NeoForge, Fabric17+declared12 Jun 2023
1.20NeoForge, Quilt, Forge, Fabric17+declared2 Jun 2023
1.19.4Fabric, Quilt, NeoForge, Forge17+declared14 Mar 2023
1.19.3Forge, Quilt, NeoForge, Fabric17+declared7 Dec 2022
1.19.2Forge, Quilt, NeoForge, Fabric17+declared5 Aug 2022
1.19.1Forge, Quilt, NeoForge, Fabric17+declared27 Jul 2022
1.19NeoForge, Quilt, Fabric, Forge17+declared7 Jun 2022
1.18.2Fabric, Forge, NeoForge, Quilt17+declared28 Feb 2022
1.18.1Fabric, Quilt, NeoForge, Forge17+declared10 Dec 2021
1.17.1Forge, Quilt, NeoForge, Fabric16+declared6 Jul 2021
1.17Forge, Quilt, NeoForge, Fabric16+declared8 Jun 2021
1.16.5Forge, Quilt, NeoForge, Fabric8+declared14 Jan 2021
1.16.4Forge, Quilt, NeoForge, Fabric8+declared29 Oct 2020
1.16.3Fabric, Quilt, NeoForge, Forge8+declared10 Sept 2020
1.16.2Fabric, Quilt, NeoForge, Forge8+declared11 Aug 2020
1.16.1Forge, Quilt, NeoForge, Fabric8+declared24 Jun 2020
1.15.2Forge, Quilt, NeoForge, Fabric8+declared17 Jan 2020
1.15.1Forge, Quilt, NeoForge, Fabric8+declared16 Dec 2019
1.15Forge, Quilt, NeoForge, Fabric8+declared9 Dec 2019
1.14.4Quilt, Forge, NeoForge, Fabric8+declared19 Jul 2019

Download

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

For Minecraft 1.21.1

Choose the loader you use before downloading.

  • NeoForge

    21.1.5 · 19 May 2025 · OpenLoader-neoforge-1.21.1-21.1.5.jar

    Get NeoForge

Most recently published release

19.0.5release12 Feb 2026

OpenLoader-Fabric-1.20.1-19.0.5.jar · 21 KB · for 1.20.1 · Fabric

Download this release
13e9c5ddacc9…
Older versions21
  • 21.1.519 May 20251.21.135 KB3.5M downloads3a4b0b6605f3…Get
  • 21.1.414 May 20251.21.135 KB760 downloadsa42741fca577…Get
  • 21.1.314 May 20251.21.135 KB142 downloadse82cd21299d5…Get
  • 21.1.228 Mar 20251.21.131 KB1.1k downloads39ca2226a7d0…Get
  • 21.1.18 Nov 20241.21.131 KB6.9k downloadsd46a385547b6…Get
  • 19.0.424 May 20241.20.121 KB1.1M downloads4f47b8889948…Get
  • 22.1.711 Mar 20241.20.425 KB15.7k downloads659ea21d3c93…Get
  • 22.0.411 Mar 20241.20.423 KB116 downloadse1525b5888bc…Get
  • 22.0.311 Mar 20241.20.422 KB102 downloads761da9d6592b…Get
  • 22.0.21 Feb 20241.20.419 KB1.1k downloadscfdda9b04099…Get
  • 22.0.113 Jan 20241.20.419 KB1.6k downloads93b686ee7036…Get
  • 21.0.19 Jan 20241.20.319 KB132 downloads79ec3dff1a47…Get
  • 20.0.68 Jan 20241.20.219 KB4.8k downloads0c8e50ba2114…Get
  • 20.0.517 Nov 20231.20.219 KB1.5k downloads556d87ef0a1e…Get
  • 20.0.415 Nov 20231.20.219 KB119 downloadsc98c8de999da…Get
  • 20.0.315 Nov 20231.20.219 KB86 downloadsc1ad35c8d7c8…Get
  • 20.0.215 Nov 20231.20.219 KB77 downloads317c6657e465…Get
  • 20.0.115 Nov 20231.20.223 KB72 downloads6af13976c838…Get
  • 19.0.33 Oct 20231.20.123 KB277.6k downloads8bd73a193872…Get
  • 19.0.221 Aug 20231.20.116 KB1.0k downloads62b05c669077…Get
  • 19.0.117 Jul 20231.20.116 KB307 downloads2837f40431e9…Get

Frequently asked

Does Open Loader work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version Open Loader 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 Open Loader support?

Everything the author has declared, from 1.14.4 up to 1.21.1. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install Open Loader 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 Open Loader support?

Fabric, Quilt, 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 Open Loader?

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 Open Loader under?

LGPL-2.1-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 Open Loader?

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 Open Loader 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.

BookshelfAn open source library for other mods!GeckoLibA 3D animation library for entities, blocks, items, armor, and more!Cloth Config API (Fabric/Forge/NeoForge)Config Screen API for MinecraftJourneyMapReal-time map used for mapping in-game or your browser as you explore.Architectury APIAn intermediary api aimed to ease developing multiplatform mods.Enchantment DescriptionsAdds in-game descriptions for enchantments to tooltips.

Used by

1 project lists Open Loader as a required dependency.

Hostile Neural Networks: Extra Data ModelsAdds extra data models to Hostile Neural Networks with support for a dozen mods.

Details from Modrinth, where the author last updated it on 12 Feb 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? .