Can this tool find the exact spawner block?

It finds the structures that contain spawners — Trial Chambers (trial spawners) and Mineshafts (cave spider spawners) — at their exact seed positions. Dungeons (isolated zombie/skeleton/spider spawners) place with per-chunk decoration randomness, so they are shown as approximate on the full seed map, not here.

What is the best spawner for an XP farm in 1.21?

Trial Chambers contain multiple trial spawners and vaults, making them the strongest XP and loot source in 1.21. Cave spider spawners in mineshafts are the classic AFK XP farm.

Minecraft Spawner Finder — Locate Trial & Cave Spider Spawners by Seed

#	Type	X, Z	Distance	/tp
Enter a seed and click Find

Where Do Spawners Come From?

In Minecraft, mob spawners (monster spawners) don’t float around at random — almost every one lives inside a generated structure. This finder locates the two structure types whose positions are 100% determined by your seed and that reliably contain spawners:

⚔️ Trial Chambers — deep-underground structures (around Y=−40 to Y=−20) packed with trial spawners and reward vaults. The single best XP and loot source in 1.21+.
⛏️ Mineshafts — sprawling tunnel networks containing cave spider spawners surrounded by cobwebs, the classic easy AFK XP farm.

A note on honesty: Isolated dungeon spawners (the small mossy rooms with a zombie, skeleton, or spider spawner) are placed during per-chunk decoration, which depends on how chunks are first loaded — so no tool can pinpoint them with 100% certainty. We show dungeons as approximate on the full map and never pretend otherwise. Individual ore veins (diamond, netherite/ancient debris) are likewise per-chunk random and are not seed-predictable, which is why you won’t find a fake “diamond finder” here.

Building an XP / Mob Farm

Trial spawners: Great for early-to-mid game gear and loot runs; bring a friend or use ominous trials for better rewards.
Cave spider farm: Wall off a cave spider spawner, funnel spiders into a 1-block gap, and finish them for fast, safe XP.
Use the /tp buttons in the results table to jump straight to any structure in-game (cheats on).

About This Tool

Trial Chamber and Mineshaft positions are computed with the cubiomes library — the same world-generation math Minecraft Java Edition uses — so results match your actual world exactly. Everything runs in your browser; your seed is never sent to a server. A free, accurate alternative to Chunkbase.

💀 Minecraft Spawner Finder

Spawner Map

Nearest Spawner Structures

🗺️ Explore the Full Seed Map

Where Do Spawners Come From?

Building an XP / Mob Farm

About This Tool

Other Minecraft Finders