Packet Fixer
by TonimatasDEV
Packet Fixer targets three kinds of network trouble: oversized NBT tags, packets that exceed protocol limits and connection timeouts.
What it does
The mod addresses a set of errors that appear in the log when a packet, an NBT tag or a payload is larger than the game allows. Examples include an NBT tag that cannot be read because its allocation exceeds the limit, a compressed packet whose size passes the protocol maximum, and a chunk packet that tries to take too much memory on read. The fixes apply to the networking code rather than to gameplay, so worlds and items stay unchanged.
Installation is optional on the client and the server, and the project is published for Fabric, Forge, NeoForge and Quilt, with builds covering 1.12.2 – 26.3 across 38 release versions. The code is released under the MIT License and is open source, with public source code and an issue tracker. The author also notes that the project covers recipe, tag and related problems through a separate mod.
Key features
Oversized NBT handling
Reads of NBT tags that exceed the allocation limit are handled so the error no longer stops the connection.
Packet size limits
Packets that are too big or badly compressed for the protocol maximum are dealt with instead of failing the session.
Payload size checks
Custom payloads that go over the byte limits are addressed, which covers both the megabyte and kilobyte cases.
Timeout reduction
Connection timeouts caused by large packets are reduced, so long transfers finish more often.
Broad loader support
One project covers Fabric, Forge, NeoForge and Quilt, with game versions 1.12.2 – 26.3 on the release list.
Compatibility
Latest build for each game version and loader.
26.x5 of 5 versions with builds
1.21.x12 of 12 versions with builds
1.20.x7 of 7 versions with builds
1.19.x5 of 5 versions with builds
1.18.x3 of 3 versions with builds
1.17.x1 of 1 version with builds
1.16.x1 of 1 version with builds
1.15.x3 of 3 versions with builds
1.12.x1 of 1 version with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Required by 23 mods
Use cases
Large modpack servers
Server owners running heavy modpacks can apply the fixes when players hit packet size errors in the log.
Modded worlds with big NBT data
Worlds that store large item or block entity data can avoid the NBT read failures these fixes address.
Who it’s for: Server owners and modpack builders who see packet or NBT size errors, and players on servers that run the mod.
How it compares
Extra Thicc Packets is a Fabric-only mod for 1.17 – 1.21.11 with a client and server environment under the MIT License, and it is not open source. XXL Packets covers Fabric, Forge and Quilt for 1.18 – 26.3 and is open source under the CC0 1.0 Universal license, with a client required and server optional environment. Robin's Unlimited Packets is Fabric-only for 1.20.1 – 1.20.4 under All rights reserved and is not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Packet Fixer | Fabric, Forge, NeoForge and Quilt | 1.12.2 – 26.3 | Client or server, optional | 2026-09-20 |
| Extra Thicc Packets | Fabric | 1.17 – 1.21.11 | Client and server | 2024-07-18 |
| XXL Packets | Fabric, Forge and Quilt | 1.18 – 26.3 | Client required, server optional | 2026-04-30 |
| Robin's Unlimited Packets | Fabric | 1.20.1 – 1.20.4 | Client and server | 2024-05-19 |
Questions
Which loaders does Packet Fixer support?
Does the server need Packet Fixer?
Does Packet Fixer change gameplay?
In the catalog
Packet Fixer is one of 3,545 Optimization mods on ModsFinder, and one of 2,575 Optimization mods for Fabric. 8,071 mods support Minecraft 26.3.
More from TonimatasDEV
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Official listing
- Modrinth page
- modrinth.com/mod/packet-fixer
- Owner
- TonimatasDEV
- Published
- 2022-11-02
- Updated on Modrinth
- 2026-09-20
- Facts verified
- 2026-10-15