Inventory

Minecraft displays the player inventory differently, according to how the window was opened. Ranges of slot indices vary in meaning between different “windows”. The Open Window packet indicates which window is being opened according to:

Type	Name	Description
0	minecraft:generic_9x1	A 1-row inventory, not used by the notchian server.
1	minecraft:generic_9x2	A 2-row inventory, not used by the notchian server.
2	minecraft:generic_9x3	General-purpose 3-row inventory. Used by Chest, minecart with chest, ender chest, and barrel
3	minecraft:generic_9x4	A 4-row inventory, not used by the notchian server.
4	minecraft:generic_9x5	A 5-row inventory, not used by the notchian server.
5	minecraft:generic_9x6	General-purpose 6-row inventory, used by large chests.
6	minecraft:generic_3x3	General-purpose 3-by-3 square inventory, used by Dispenser and Dropper
7	minecraft:anvil	Anvil
8	minecraft:beacon	Beacon
9	minecraft:blast_furnace	Blast Furnace
10	minecraft:brewing_stand	Brewing stand
11	minecraft:crafting	Crafting table
12	minecraft:enchantment	Enchantment table
13	minecraft:furnace	Furnace
14	minecraft:grindstone	Grindstone
15	minecraft:hopper	Hopper or minecart with hopper
16	minecraft:lectern	Lectern
17	minecraft:loom	Loom
18	minecraft:merchant	Villager, Wandering Trader
19	minecraft:shulker_box	Shulker box
20	minecraft:legacy_smithing	Smithing Table The Notchian server only sends this type if feature flag update_1_20 was not enabled
21	minecraft:smithing	Smithing Table The Notchian server only sends this type if feature flag update_1_20 was enabled
22	minecraft:smoker	Smoker
23	minecraft:cartography	Cartography Table
24	minecraft:stonecutter	Stonecutter

	The following information needs to be added to this page:
	Most of the inventories new to 1.14 have buttons, which are probably implemented using Protocol#Click Window Button. This needs to be confirmed and the button IDs should be checked.

The slot number is calculated starting at 0, counting up through the window's unique slots, and then counting through the players inventory.

For all windows, the slot in the upper-left corner of the player's inventory is slot n where n is the number of unique slots, and slot number -999 is always used for clicking outside the window.

The default inventory window, which is never explicitly opened by the server, has 10 unique slots.

Rectangular regions are always indexed starting with the upper-left corner and scanning across rows. If a window has a crafting region, the output slot is always slot 0 followed immediately by the input region.

Each window type is described in the following sections. All slot index ranges are inclusive and reflect the indices observed in the Minecraft protocol.

For the window properties (additional data in each window, e.g. smelting progress or enchantments), refer to the table in the Window Property packet.

Using -1 as slot index and as window id will set the cursor item (the stack dragged with the mouse).

Player Inventory

Inventory slots

This is the inventory window that the player can always open, typically by pressing E since Beta 1.4. Before, you had to press I.

Slot range	Description
0	crafting output
1–4	2×2 crafting input (1 + x + 2 * y)
5–8	armor (head, chest, legs, feet)
9–35	main inventory
36–44	hotbar
45	Offhand slot

Note that this is different from inventory items stored in a player.dat file. This may help: https://gist.github.com/459a1691c3dd751db160

Chest

Chest slots

This is the window that is opened when the player right-clicks on a single chest block.

Slot range	Description
0–26	chest
27–53	main inventory
54–62	hotbar

Double/large chest slots

Large chest

This is the window that is opened when the player right-clicks on a double chest block (two adjacent chest blocks).

Slot range	Description
0–53	chest
54–80	main inventory
81–89	hotbar

It is possible to receive different "Number Of Slots" parameters than those two. In vanilla, using /setblock four times around a chest and then opening the middle chest will open a window with 5*27 chest slots. Some custom servers will send chest inventories with other sizes, usually ranging from 1 row to 6 rows. These may be used for custom GUIs. It is thus important to correctly use the "Number Of Slots" parameter in the open window packet to determine the number of rows in the chest, rather than hardcoding what constitutes a regular chest or a large chest.

Crafting table

Crafting table slots

This is the window that is opened when the player right-clicks on a workbench.

Slot range	Description
0	crafting output
1–9	3×3 crafting input (1 + x + 3 * y)
10–36	main inventory
37–45	hotbar

If the "Number Of Slots" parameter is not set to 0, the opened window will behave like a container window.

Furnace

Furnace slots

The window that appears when a furnace is right-clicked.

Slot range	Description
0	ingredient
1	fuel
2	output
3–29	main inventory
30–38	hotbar

If the "Number Of Slots" parameter is inferior to 3, placing an item in a slot may crash the client.

Blast Furnace

Blast Furnace slots

The GUI that appears when a blast furnace is opened. Same layout as a furnace; however, the recipe book displays blast furnace recipes instead of regular furnace recipes.

Slot range	Description
0	ingredient
1	fuel
2	output
3–29	main inventory
30–38	hotbar

Smoker

Smoker slots

The GUI that appears when a smoker is opened. Same layout as a furnace; however, the recipe book displays smoker recipes instead of regular furnace recipes.

Slot range	Description
0	ingredient
1	fuel
2	output
3–29	main inventory
30–38	hotbar

Dispenser

Dispenser/dropper slots

The inventory that appears when a dispenser or dropper is opened.

Slot range	Description
0–8	3×3 dispenser contents (x + 3 * y)
9–35	main inventory
36-44	hotbar

If the "Number Of Slots" parameter is inferior to 9, placing an item in a slot may crash the client.

Enchantment Table

Enchantment table slots

The inventory of an enchantment table. The enchant buttons trigger a Enchant item packet.

Slot range	Description
0	item to enchant
1	lapis lazuli slot
2–28	main inventory
29–37	hotbar

Brewing stand

Brewing stand slots

The GUI that appears when a brewing stand is opened.

Slot range	Description
0-2	bottles/potions
3	potion ingredient
4	blaze powder
5-31	main inventory
32-40	hotbar

Villager trading

Merchant slots

The GUI that appears when a villager is right-clicked. Note that if the villager only requires one item, you can put it in either (or both) slots.

Slot range	Description
0-1	input items
2	result
3–29	main inventory
30–38	hotbar

Beacon

Beacon slots

The window that appears when a beacon is right-clicked.

Slot range	Description
0	payment item
1–27	main inventory
28–36	hotbar

Anvil

Anvil slots

Slot range	Description
0	first item
1	second item
2	result
3–29	main inventory
30–38	hotbar

Hopper

Hopper slots

The window that appears when a hopper or hopper minecart is opened.

Slot range	Description
0-4	hopper slots
5–31	main inventory
32–40	hotbar

Shulker box

Shulker box slots

This is the window that is opened when the player right-clicks on a shulker box chest.

Slot range	Description
0–26	box slots
27–53	main inventory
54–62	hotbar

Llama

Llama slots

The inventory that appears when a tamed llama is right-clicked and has a chest, or when the player's inventory is opened while riding a tamed llama. Depending on the value of the strength field, the number of chest rows may vary (max is 5, so 15 slots).

There still is a saddle slot, even though it cannot be used and is invisible.

Slot positions within the llama inventory vary - slot 2 may be at (1,0) or at (0,1) depending on the number of columns.

Slot range	Description
0	saddle
1	carpet
2-(2+3*Strength)	llama inventory
(2+3*Strength)+1-(2+3*Strength)+27	player inventory
(2+3*Strength)+28-(2+3*Strength)+35	hotbar

• 

  Unchested llama

• 

  Llama with strength 1

• 

  Llama with strength 2

• 

  Llama with strength 3

• 

  Llama with strength 4

• 

  Llama with strength 5

Horse

Horse slots

The window for when a tamed horse is right-clicked or the player's inventory is opened while riding a horse.

Slot range	Description
0	saddle
1	armor
2–28	main inventory
29–37	hotbar

• 

  Horse slots

• 

  Skeleton horse slots

• 

  Zombie horse slots

Donkey

Donkey slots

The inventory that appears when a tamed donkey (or mule?) is right-clicked, or when the player's inventory is opened while riding a tamed donkey or mule.

There still is an armor slot, even though it cannot be used and is invisible.

Slot range	Description
0	saddle
1	armor
2–16	donkey inventory
17–43 (2-28 if unchested)	player inventory
44–52 (29-37 if unchested)	hotbar

• 

  Unchested donkey

• 

  Chested donkey

• 

  Unchested mule

• 

  Chested mule

Cartography Table

Cartography table slots

The GUI that appears when a cartography table is opened.

Slot range	Description
0	map
1	paper
2	output
3–29	main inventory
30–38	hotbar

Grindstone

Grindstone slots

Slot range	Description
0	first item
1	second item
2	result
3–29	main inventory
30–38	hotbar

Lectern

Lectern UI

This is a regular container, unlike with held books opened via Protocol#Open Book. The player inventory is not included.

Slot range	Description
0	book

Loom

Loom slots

Slot range	Description
0	banner
1	dye
2	pattern
3	result
4–30	main inventory
31–39	hotbar

Stonecutter

Stonecutter slots

Slot range	Description
0	input
1	result
2–28	main inventory
29–37	hotbar

Legacy Smithing Table

Legacy Smithing Table slots

The inventory that appears when a smithing table is opened.

The Notchian server only sends this type if feature flag update_1_20 was not enabled

Slot range	Description
0	base item
1	additional item
2	result
3–29	main inventory
30–38	hotbar

Smithing Table

Smithing Table slots

The inventory that appears when a smithing table is opened.

The Notchian server only sends this type if feature flag update_1_20 was enabled

Slot range	Description
0	template
1	base item
2	additional item
3	result
4–30	main inventory
31–39	hotbar