Aternos can run Minecraft Java Edition mods, but only within a defined set of rules. Your server needs a supported mod loader, and each mod must be available in Aternos’s online add-ons library for the Minecraft and loader versions you choose. Aternos does not accept arbitrary custom mod or modpack uploads. Anything outside its catalog has to go through its paid hosting service, exaroton.
The two checks that decide whether a mod runs
Treat “which mods?” as two separate questions. First, confirm the mod loader the mod is built for. Second, confirm that the exact mod and version appear in the Aternos add-ons search for that loader and Minecraft version. Passing the first check does not guarantee the second.
- Open the mod’s project page on CurseForge or Modrinth and note the loader, Minecraft version, and any required dependencies.
- Choose the same loader on your Aternos server.
- Search the add-ons library for the mod and select the version that matches your Minecraft version.
- Install each listed dependency as well. Aternos often lists dependencies in its add-ons list, but the project description on Modrinth or CurseForge is the reliable reference.
Supported mod loaders
Aternos’s help documentation names four loaders for mods: Forge, Fabric, NeoForge, and Quilt. Forge is the loader with the largest selection of add-ons, according to Aternos. The table below reflects only what Aternos states; where it does not give a detail, the cell says so.
| Loader | Named in Aternos help | Selection compared with Forge | Example from Aternos guides |
|---|---|---|---|
| Forge | Yes | Largest selection, per Aternos | Not stated |
| Fabric | Yes | Named as an alternative; size not stated | Origins guide: install Fabric, Fabric API, and Origins at compatible versions |
| NeoForge | Yes | Named as an alternative; size not stated | Not stated |
| Quilt | Yes | Named as an alternative; size not stated | Not stated |
The Origins example shows the pattern to follow rather than a current recommendation. The Aternos guide includes an older version example, so always match the version shown on the mod’s page to your server’s Minecraft version.
Recommended Free Tools
#1 Best Overall
- 【Perfectly Fit in Server Aprons】: Our black server book size is 8.15" x 5.12" x 0.59", which can hold a regular guest checkbook and is handy to be carried in a server apron pocket, won’t be too tight or too big, efficiency as a server money holder.
- 【Stay Organized All in Needs】: 9 compartments and 1 pen holder in one serving book, with a zipper pocket to store your coins, changes, and money. Multi-functional pockets to organize checkbooks, cash, ticket books, server pads, credit cards, coupons, or any other paper documents, nice waitress accessories partner for servers.
- 【Waterproof Leather Material】: The waitress book is made of premium sturdy and longevity PU leather, Eco-friendly and odorless, features excellent workmanship and tight stitching, easy to clean. Plus an elastic pen loop to be a nice waitstaff organizer to help you hold the pen that is always away from home and improve the service speed.
- 【Portable and Long-lasting】: Our server books for the waiter are lightweight to carry around, and sturdy as a guest checkbook holder, premium material makes them sturdy and longevity and won’t easily deform or press the belly when bent over.
- 【100% Satisfaction Guarantee】: We hope you love your server book wallet and place your order with confidence, all of our men’s & women’s server books are backed by a full replacement guarantee. Any questions will be answered within 24 hours.
Individual mods versus modpacks
Aternos runs mods in two different ways, and they behave differently.
| Route | Where the content comes from | How you control it | Limits |
|---|---|---|---|
| Individual mods | Aternos add-ons library, which draws from CurseForge and Modrinth | You pick each mod and version | Only mods present in the catalog for your loader and version |
| Modpacks | Supported packs listed from CurseForge, Modrinth, ATLauncher, and the FTB App | You install a whole pack from the server’s software section | One pack at a time; individual mods and configurations inside the pack cannot be added or changed |
A supported modpack is a bundled experience. Aternos updates packs automatically and recommends using the latest pack version when you report a problem. If you need a specific combination of mods, the individual-mod route works only when every project you want is in the Aternos catalog. If one is missing, you have to look at the uploads options below.
Rank #2
- 100% Satisfaction Warranty – Our servers book for waitress organization are handcrafted with elegant stitching that lasts. We take pride in offering our customers a waitress book made to exceptional quality standards. To ensure satisfaction, every waiters checkbook is backed by a 1-YEAR WARRANTY. If you are not 100% SATISFIED for any reason we will send you a replacement. No Questions Asked
- Holds up under Pressure – When you're taking orders the last thing you need is a flimsy waiter book that keeps bending. Our 8”x5” server books for waitress organization is the only one with a premium reinforced dual inner core. Providing an unmatched sturdy reliable writing surface that will last for years
- On Another Level – Halt the endless cycle of replacing your cheap thin black server book that barely lasts a week. This serving book for waitresses can become your permanent partner. Crafted with overwhelmingly strong attention to detail, the waiter checkbook offers an unparalleled value that you won’t regret investing in
- Scribble In Style – Impression is everything. You’re making a statement when you bring out this sleek vegan leather serving book. Our serving books have no logos or images and exquisite stitching for a professional feel your colleagues will envy
- Stay Calm and Collected – Whether you have 1 table or 7, organization is key. This server checkbook has 9 versatile pockets including a durable metal zipper to keep your cash secure. Stay on top of everything with this deluxe server book organizer and bring superior service to every customer
Playing on a modpack server
Every player who joins needs to install the same pack on their own computer through the matching official launcher, and the pack version must match the server’s. Installing the pack on the server alone is not enough.
Custom uploads are not supported
Aternos does not offer FTP or full file upload for custom mods and modpacks. Its help article on uploading files and FTP access states: “Aternos doesn’t provide FTP (File Transfer Protocol) access to your server files.” Aternos gives two reasons: keeping the service free, and reducing the risk of malicious code entering its servers.
Free tools Windows power users keep installed
One-click scans. No signup required.
If you need custom jars or a hand-built modpack, Aternos directs you to exaroton, its paid hosting service, which offers custom file uploads and more control over the server. Aternos does not describe the features of exaroton beyond this, so check that service directly before you move a server.
Dependencies and server-side requirements
Many mods depend on libraries. The Tinkers’ Construct example in Aternos’s documentation requires Mantle, so Mantle must be installed alongside it. Some dependencies must also be installed on the server, not only on players’ computers.
Not every client-side mod belongs on a server. Before you add a mod, read its project page to check whether it is intended to run on a server. A mod that only changes visuals or the user interface usually does not need to be on the server, while one that adds blocks, items, or world generation does.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Keeping the client and server in step
The mod loader and version on the client must match the server. Players also need the same mods and mod versions, and the Minecraft version must match as well. Mismatches show up as errors, and Aternos specifically lists registry-data synchronization failures and missing mod entries as symptoms of this problem.
Quick wins for a faster PC:
Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Best Value
- 【Perfectly Fit in Server Aprons】: Our black server book size is 8.15" x 5.12" x 0.59", which can hold a regular guest checkbook and is handy to be carried in a server apron pocket, won’t be too tight or too big, efficiency as a server money holder.
- 【Stay Organized All in Needs】: 9 compartments and 1 pen holder in one serving book, with a zipper pocket to store your coins, changes, and money. Multi-functional pockets to organize checkbooks, cash, ticket books, server pads, credit cards, coupons, or any other paper documents, nice waitress accessories partner for servers.
- 【Waterproof Leather Material】: The waitress book is made of premium sturdy PU leather, Eco-friendly and odorless, features excellent workmanship and tight stitching, easy to clean. Plus an elastic pen loop to be a nice waitstaff organizer to help you hold the pen that is always away from home and improve the service speed.
- 【Portable and Long-lasting】: Our server books for the waiter are lightweight to carry around, and sturdy as a guest checkbook holder, premium material makes them sturdy and won’t easily deform or press the belly when bent over.
- 【100% Satisfaction Guarantee】: We hope you love your server book wallet and place your order with confidence, all of our men’s & women’s server books are backed by a replacement guarantee. Any questions will be answered within 24 hours.
- Registry-data synchronization failure: the client and server disagree on the mod content or versions. Compare the mod list and versions on both sides.
- Missing mod entries: a mod is installed on one side but not the other, or a dependency is absent. Check the dependency list first.
- Connection problems after a pack update: the player may still be on the old pack version. Have them reinstall the current pack version through the official launcher.
When the mod you want is missing
Aternos has a suggestion system for mods and modpacks that are not yet in its library. Its help article sets these conditions for a suggestion to be accepted:
- The project is hosted on a supported site.
- It can be downloaded directly.
- It is free.
- It is reasonably popular and actively maintained.
- It has a detailed English description.
Aternos reviews suggestions by hand, and it says review can take days or weeks. It does not publish a download threshold for “popular.” Projects may also be rejected for technical reasons, such as a severe performance impact or a need for an additional open port, or if the author does not allow redistribution.
For modpacks, the pack must include server files. Aternos says packs on Modrinth and ATLauncher always include them, while CurseForge and TechnicPack listings have to be checked individually.
Scope of this guide
This applies to Minecraft Java Edition only. Aternos’s catalog changes over time, so a mod that is available today may be removed or updated, and a mod that is missing may be added later. Check the live add-ons library for the exact Minecraft and loader version you plan to use.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
