Fabric vs Quilt: Do You Need Quilt?

Fabric is one of the most popular mod loaders for Minecraft servers. Sooner or later you also run into Quilt, a second loader that says it runs the same mods.

In this guide, we will cover what Fabric is, what Quilt added, how compatible the two are, what QSL and QFAPI were, where Quilt stands at the end of 2026, and which one you should run.

By the end of this guide, you will know whether your server needs Quilt at all.

What Fabric Is

Fabric describes itself as "a modular, lightweight mod loader for Minecraft" (source: fabricmc.net). It has three parts:

• Fabric Loader → loads the mods. The latest release is 0.20.1, from October 2026.
• Fabric API → a shared library that most mods need in the mods folder.
• Loom → a build tool for mod developers.

Fabric updates quickly. Its version list already has 26.3 as stable and 26.4 snapshots (source: Fabric meta). On Modrinth, over 9,000 mods have a Fabric build for 26.3, more than any other loader.

To run a Fabric server, download the server launcher jar from fabricmc.net/use/server and start it like any other jar:

java -Xmx4G -jar fabric-server-launcher.jar nogui

Use the real file name of the jar you downloaded. It fetches the Minecraft server and Fabric Loader on the first run.

What Quilt Added

Quilt started in 2021 as a community-driven project built on Fabric's technology (source: QuiltMC). Its loader adds features on top of what Fabric Loader does.

For server owners, the useful extras are:

• Detailed crash reports and error screens.
• Loading mods from subfolders inside mods, so you can group them. This is on by default, and folders ending in .disabled are skipped.
• Dependency overrides in config/quilt-loader-overrides.json, for when a mod declares the wrong dependencies.
• More APIs and options for mod developers, using a quilt.mod.json file.

Quilt also made two libraries:

• QSL (Quilt Standard Libraries) → Quilt's own version of Fabric API.
• QFAPI (Quilted Fabric API) → a bundle that gave Fabric mods the Fabric API they expect, running on top of QSL.

Compatibility

• Quilt → loads Quilt mods and most Fabric mods.
• Fabric → loads Fabric mods only. A mod with only a quilt.mod.json won't load on Fabric.
• Up to Minecraft 1.21 → install QFAPI on Quilt instead of Fabric API.
• Newer versions → there is no QFAPI, so Quilt setups use the regular Fabric API.

Back in 2024, Quilt cut QSL down to two small modules for 1.20.6 and 1.21 and said Fabric mods for those versions "will work fine" (source: QuiltMC).

"Most" is the key word. A few mods rely on Fabric Loader internals or are only tested on Fabric, and some authors no longer make Quilt builds at all. Mixson's page, for example, says Quilt support "has been paused due to insufficent usage" and tells Quilt users on 26.x to use the Fabric version (source: Modrinth).

Server-side mods work on both

The popular performance mods don't force a choice. On Modrinth, Lithium lists Fabric, Quilt and NeoForge, and FerriteCore lists Fabric, Quilt, Forge and NeoForge. Lithium also works on the server alone, so players can join with a normal client.

Checking what a modpack uses

A modpack is built for one loader, and its files say which. In a Modrinth .mrpack, open modrinth.index.json and look at the dependencies:

"dependencies": {
  "minecraft": "26.3",
  "fabric-loader": "0.20.1"
}

If you see fabric-loader, run Fabric. If you see quilt-loader, run Quilt with that loader version. The modpack page on Modrinth or CurseForge shows the same information.

Where Quilt Stands in November 2026

This is the part that matters most if you are starting a new server.

• Libraries retired: on February 3, 2026, Quilt retired QSL, Quilt Kotlin Libraries and QFAPI for Minecraft 26.1 and newer. Older versions still get maintenance. The post says QSL relied on a single developer and proved very hard to maintain (source: QuiltMC).
• Mappings retired: Quilt Mappings aren't made for new versions, since Mojang stopped obfuscating the game in 26.1.
• Loader still alive: Quilt Loader is the focus now. Its code got commits as recently as late October 2026, the newest builds are 0.30.2 and 0.31.0 betas, and its version list includes 26.3 and 26.4 snapshots.
• Small team: the team says it is made of volunteers who build Quilt as a passion, not as a job.

So Quilt isn't dead, but it is now mostly a loader that runs Fabric mods with a few extra features.

Modpacks are a good signal of real use, because every pack has to pick one loader. On Modrinth the gap is large, and it has grown with each version.

Fabric vs Quilt at a Glance

Topic	Fabric	Quilt
Runs Fabric mods	Yes	Most
Runs Quilt-only mods	No	Yes
Standard library	Fabric API	QFAPI up to 1.21, Fabric API after
Newest Minecraft	26.3 and 26.4 snapshots	26.3 and 26.4 snapshots
Extra loader features	Basic	Crash reports, subfolders, dependency overrides
Modrinth modpacks for 26.3	805	10

Which One to Run

For most servers, no. Fabric does the job with less to worry about.

Choose Fabric if

• You are starting a new modded server.
• You want mods on the newest Minecraft version.
• You want the widest choice of mods, and help that is easy to find.

Choose Quilt if

• A modpack lists quilt-loader in its files.
• You need a Quilt-only mod on an older version.
• You rely on a Quilt Loader feature, such as dependency overrides.

Moving from Quilt to Fabric

1. Take a backup. See How to Back Up and Restore Your Minecraft Server.
2. Switch the loader to Fabric on the same Minecraft version.
3. Replace QFAPI or QSL with Fabric API.
4. Remove mods that only have a quilt.mod.json, or find their Fabric versions.
5. Start the server and read the log for mods that failed to load.

On EternalZero, Fabric and Quilt are both in the Versions Changer, and you can get Fabric API from the Mods and Plugins tab. For more on loaders, read Vanilla, Paper, Fabric or Forge or the full list in What's the Best Minecraft Version for Your Server?

Wrapping Up

Use Fabric for new servers. It gets new versions early, and it has far more mods and modpacks built for it.

Keep Quilt for the cases that need it, like a pack built on Quilt. If you already run Quilt and it works, there is no rush, but plan your move to Fabric before your next big Minecraft update.