ModsFinder

Player Inventory Sync

by Holysweet

Player Inventory Sync corrects inventory desyncs in NeoForge, so that items stop jumping back to their previous slot after a client action.

NeoForgeClient and serverMIT LicenseOpen source1.21.1 – 1.21.8

What it does

When a desync happens, the client shows an inventory state the server has not confirmed, and the stack snaps back once the sync arrives. Player Inventory Sync addresses this by keeping the two sides aligned, which reduces the cases where blocks seem to vanish after placement, buckets scoop from the wrong source, or items land in unexpected hotbar or container slots. The author reports that opening a chest can bring a missing container view back, and that the same fix covers the hotbar in that situation.

The mod is built for NeoForge and is published for 1.21.1 – 1.21.8, with files for each of the eight release versions in that range. Latest file is 1.0.2 for 1.21.8, released 2025-09-03. A server running it needs every connecting player to have it too. It works on both dedicated servers and single-player worlds, and it is dropped into the mods folder like any other NeoForge mod. The code is released under the MIT License and is open source, with public source code and an issue tracker.

Key features

  1. Instant inventory sync

    Corrects desynced inventory state so the stack shown on screen matches what the server holds.

  2. Placement and bucket fixes

    Targets blocks that disappear after placing and buckets that scoop from the wrong source.

  3. Container slot correction

    Stops items from appearing in random slots when interacting with chests and other containers.

  4. Single-player and server support

    Works in both single-player worlds and multiplayer servers without separate configuration.

Compatibility

Latest build for each game version and loader.

1.21.81.0.2
1.21.71.0.2
1.21.61.0.2
1.21.51.0.2
1.21.41.0.2
1.21.31.0.2
1.21.21.0.2
1.21.11.0.2
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Use cases

Modpacks

Modpack builders can include the mod to reduce inventory glitches for players on the same pack.

Who it’s for: Players who notice inventory glitches in NeoForge 1.21.x worlds, and modpack authors who want fewer of those reports from their players.

Questions

Does Player Inventory Sync need to be installed on the server?

Yes. Servers that run it need every player to install it too.

Which loader and versions does Player Inventory Sync support?

It supports NeoForge only, with files for 1.21.1 – 1.21.8. Fabric and Forge builds are not listed.

Does the mod work in single-player worlds?

Yes. The author notes that it works on both servers and single-player worlds.

In the catalog

Player Inventory Sync is one of 3,545 Optimization mods on ModsFinder, and one of 1,250 Optimization mods for NeoForge. 17,695 mods support Minecraft 1.21.8.

Optimization mods3,545NeoForge modsMods for 1.21.817,695

More from Holysweet

All projects
Right Click Ladder1.21.1 – 1.21.8Disenchant Anvil1.21.1 – 1.21.8Quest Shop1.21.1

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What the author says

You know that moment where you place a block, it vanishes, and you have to walk over to a chest to find where it went? 😤 Or when you scoop a bucket of lava and suddenly… nope, bucket’s empty? PlayerInventorySync fixes those annoying inventory desyncs by instantly snapping your inventory back in sync when Minecraft…
Holysweet, on the Modrinth page

Official listing

Owner
Holysweet
Published
2025-09-01
Updated on Modrinth
2025-09-03
Facts verified
2026-10-15

Tags

OptimizationUtility
Open on ModrinthCompare