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ViaBackwards

ViaBackwards

Allow older clients to connect to newer servers.

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Compatibility

Minecraft: Java Edition

1.21.x
1.20.x
1.19.x
1.18.x
1.17.x
1.16.x
1.15.x
1.14.x
1.13.x
1.12.x
1.11.x
1.10.x

Platforms

BungeeCord
Fabric
Folia
Paper
Sponge
Velocity

Supported environments

Client-side
Server-side
Client and server

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Links

Report issues View source Join Discord server
Sponsor on GitHub

Creators

kennytv
kennytv Maintainer
creeper123123321
creeper123123321 Developer
FlorianMichael
FlorianMichael Maintainer

Details

Licensed GPL-3.0-only
Published last year
Updated 1 hour ago

ViaBackwards

On Fabric, use either ViaFabric or ViaFabricPlus. To override the included version

  • in ViaFabric, put ViaBackwards into the mods folder
  • in ViaFabricPlus, put ViaBackwards into the ViaFabricPlus/jars folder

Depending on the platform and version, this also requires ViaVersion.

Requires Java 17. See here how to update your installed Java version. As a last resort, you can download Java 8 downgraded builds from our ci.

Get access to Via* with new MC version support early

Starting with 1.20.5, ViaVersion and ViaBackwards will only be released a day or so after a Minecraft update unless the protocol changes of the update were trivial. If you want early-access, usually days or even weeks before the final release, you can subscribe to either:

  • GitHub Sponsors (preferred option, also comes with source code access. Use the /verify command on this Discord after), or alternatively
  • Patreon (see the highest tier and make sure to link Patreon to your Discord account under Discord Settings->Connections)

Note on release channels

It is recommended to always use the latest beta release. Alpha builds are used for work on snapshot version compatibility or other cutting-edge changes.

Always use the same build channel across the ViaVersion, ViaBackwards, and ViaRewind projects.

Releases/Dev Builds

You can find releases in the following places:

Dev builds for all of our projects are on our Jenkins server:

Known issues

  • 1.17+ min_y and height world values that are not 0/256 are not supported. Clients older than 1.17 will not be able to see or interact with blocks below y=0 and above y=255
  • <1.17 clients on 1.17+ servers might experience inventory desyncs on certain inventory click actions
  • Sound mappings are incomplete (see here)

Other Links

Maven: https://repo.viaversion.com

List of contributors: https://github.com/ViaVersion/ViaBackwards/graphs/contributors

Special Thanks

https://www.yourkit.com/

YourKit supports open source projects with innovative and intelligent tools for monitoring and profiling Java and .NET applications. YourKit is the creator of YourKit Java Profiler, YourKit .NET Profiler, and YourKit YouMonitor.