Ultimate Key Lock
by Nanaky
Ultimate Key Lock lets players lock chests, doors and other containers with keys that bind to a single block.
What it does
Keys are bound to the block they lock. Using the same key on its bound block opens it again, and a key that is lost keeps its ID and any custom name. Keys receive a unique ID on first use, similar to vanilla maps, and are renamed automatically after the block they open, in most supported languages. A player can still give a key a custom name, which takes priority over the automatic rename.
Locked blocks interact with Redstone and automation: buttons can open locked doors, hoppers can pass items down into a locked chest, and dispensers can use keys to lock blocks. Copper Golems ignore locked chests, and villagers and zombies cannot break locked doors. Every player and the server need a copy of the mod. Files are published for Fabric only, for 26.1 – 26.3 across five release versions, and the code is covered by All rights reserved, not open source.
Key features
Keys bound to blocks
Each key opens only the block it was made for, so a key can be used on one chest or door at a time.
Trial Key locking
Trial Keys lock doors and containers, and the Ominous variant still lets its owner use the block without a key.
Locked block protection
Locked chests and trapdoors cannot be opened or destroyed by other players or mobs without the key.
Redstone automation
Buttons, hoppers and dispensers can work with locked blocks, which supports automated locking systems.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Players who want to restrict access to chests and doors on a survival world or a multiplayer server, and builders who set up locked storage in automated Redstone systems.
How it compares
Lockkey runs on Fabric for 26.1.1 – 26.1.2, is client and server, and is released under the MIT License. Its source code is open. Lock and Key works on Fabric, Forge, NeoForge and Quilt for 1.21 – 1.21.1; is needed on the server, with the client optional. It is released under the MIT License, but its source code is not published. Ultimate Key Lock is published for Fabric only, is client and server, and is not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Ultimate Key Lock | Fabric | 26.1 – 26.3 | Client and server | 2026-09-16 |
| Lockkey | Fabric | 26.1.1 – 26.1.2 | Client and server | 2026-05-26 |
| Lock and Key | Fabric, Forge, NeoForge and Quilt | 1.21 – 1.21.1 | Server required, client optional | 2024-08-26 |
Questions
Does Ultimate Key Lock need Fabric API?
Does the server need Ultimate Key Lock?
Which Minecraft versions does Ultimate Key Lock support?
In the catalog
Ultimate Key Lock is one of 4,058 Storage mods on ModsFinder, and one of 2,474 Storage mods for Fabric. 8,071 mods support Minecraft 26.3.
More from Nanaky
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What the author says
# 🗝️ FEATURES ### 🔒 Locking - Trial Keys on any lockable block will prevent interaction with it. Chests will no longer open (protecting their inventory), neither will doors. - Ominous Trial Keys will still allow the Owner (the Player who used it) to interact with the block, without needing the key. This means they…
Official listing
- Modrinth page
- modrinth.com/mod/ultimate_key_lock
- Owner
- Nanaky
- Published
- 2026-05-27
- Updated on Modrinth
- 2026-09-16
- Facts verified
- 2026-10-15