Java Edition · command generators, build calculators, and a seed finder — runs entirely in this page, no install, no network calls.
Stuck on what to build? Roll a build challenge — a structure, a theme, and a twist that makes it more interesting than just building the obvious thing. Don't like one piece? Lock the ones you're keeping and reroll the rest.
Nothing logged yet — roll an idea above and mark it built once you're done.
Pick what you want to do, fill in a few fields in plain language, and the exact command appears below — ready to paste into chat, a command block, or a .mcfunction file. The command updates live as you type, so you can watch how it's built. The Give Item generator supports both the classic NBT format (~1.13–1.20.4, works on more servers/versions) and the newer item-component format (1.20.5+) — pick whichever matches your version.
One click, a whole block of commands — faster than filling out Give Item over and over. Each line is a separate command: paste the whole block into a .mcfunction file or a chain of command blocks, or copy/run them one at a time in chat if your chat box only takes one line.
The big, dramatic stuff — clearing mobs, calling lightning, teleporting far away, and maxing out effects. All real commands with real effects, so read the small notes before you paste.
Clears mobs from the loaded world. This can't be undone — killing "all mobs" removes friendly animals and tamed pets too, not just hostile ones.
Real lightning — it can set nearby things on fire and hurts anything standing where it strikes, including you.
Jumps a random huge distance from wherever you are right now — good for finding fresh, unexplored land. Height (Y) stays the same, so you might land in the air or underground; keep an eye out when you arrive.
Level 255 and an ~11-day duration — about as far as the game lets you push a single effect.
One click gives every safe positive effect (speed, jump boost, strength, resistance, fire resistance, water breathing, night vision, regeneration, saturation, haste) at max level and ~11 days — basically invincible. Resistance at this level also covers the fall damage from the huge jumps.
Hand any item to a player, optionally enchanted, renamed, or unbreakable.
Spawn any creature, friendly or hostile, with a few common tweaks.
Want it to start with a potion effect or set health? Summon it here, then switch to the Potion Effect tab and target it with a selector like @e[type=minecraft:zombie,limit=1,sort=nearest] — more reliable than guessing at newer entity-data syntax.
Build a formatted chat message with colors, bold/italic, and an optional click-to-run-command — the "pro" trick behind custom server announcements and NPC dialogue. The click-to-run-command part uses the pre-1.21.5 field names (clickEvent/value); on 1.21.5+ those were renamed to click_event/command.
A curated set of common recipes, not the full ~1000-item registry, but every one shown here has been checked against Minecraft's own recipe data for Java 1.21. Each grid shows what goes where, viewed the same way the in-game crafting grid is laid out — for a shaped recipe, the pattern can sit anywhere in the 3×3 grid as long as the relative arrangement matches, it doesn't have to be crammed into the top-left corner like the picture. Netherite gear isn't crafted at a table at all; it's a Smithing Table upgrade from its diamond equivalent, shown separately below.
Component behavior is exact and well documented. The circuit diagrams below are limited to a few classic, extremely well-established single-purpose builds — for multi-input logic gates (AND/OR/XOR), wiring varies by design, so this covers the underlying principle in words rather than asserting one exact layout as canonical.
| Component | Behavior |
|---|
Straight arithmetic and documented geometry — no game-internal guessing here, so these are exact, not approximate.
How many total experience points it takes to reach a level, using the standard published Java Edition formula.
Every block in the Nether equals 8 blocks in the Overworld — type in either side and the other fills in. Y (height) isn't affected by the conversion.
For round towers, domes, and arenas — each square is one block, viewed from above. Build one ring for a flat circle, or stack the same pattern vertically for a cylinder.
blocks in this pattern.
The build most people get wrong by eye. Shown one horizontal layer at a time — slide through layers from the bottom to the top and build each one, or use only the top half for a dome roof.
blocks total across every layer.
Each level of a beacon pyramid is a square ring 2 blocks wider per side than the one above — that geometric fact is why the totals below are exact, computed live rather than looked up.
A seed is just a number that determines everything about a Minecraft world — same seed, same version, same world, every time. This scans candidate seeds and finds ones where the structures you pick land close to spawn, using the game's real placement math.