Seed (level generation)

Seeds are values made up of character(s) (including negative or positive integers) that are used as the basis for generating every Minecraft world.

Compatibility
Seeds are somewhat compatible across editions, with terrain generation and biomes being the same. However, structure locations still remain different between Java Edition and Bedrock Edition.

Determining the seed
$$, the player can enter the command to view the world's seed. This command is available in singleplayer worlds even if cheats are off. The player can also select 'Re-create' in the Worlds menu to see the seed.

$$, the seed can be found on the world options screen. There are also seed templates that offers the player several pre-set seeds to generate worlds with specific features near the spawn point. Additionally, the beta version has a visible seed on the top of the screen.

Realms
$$, a player can type in the chat. $$, the seed is not visible when playing on Realms.

General
If the seed contains characters other than numbers or is greater than or equal to 20 characters in length, the Java  function is used to generate a number seed. This restricts Minecraft to a subset of the possible worlds to 232 (or 4,294,967,296), due to the datatype used. Number seeds or a default world seed must be used to access the full set of possible worlds (264, or 18,446,744,073,709,551,616).

Overlap between editions
All Java and Bedrock Edition seeds in the range from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807, generate the same terrain and biomes in both Java and Bedrock editions, although with differing structures, decorator placements, carver caves, and mob spawns.

Generation quirks
Through certain seeds, it is possible to observe interesting effects.

Changing terrain without changing some structures
Only certain sections of the seed are used to generate specific features within the world. It is possible to generate multiple worlds with identical cave systems, Nether biomes and other arrangements of generated structures simply by converting the seed into binary and tweaking the desired bits. An example is the seed generator using only the first 48 bits to generate cave systems and badlands clay banding layers.

Repetition


Certain seeds return 0 in the internal code, causing infinite arrays of caves and other structures to generate. $$, the seed 107038380838084 returns 0 on the first call and 164311266871034 returns 0 on the second call, causing mineshafts, caves and underwater ravines to loop on the X and Z axes respectively.

Features in seeds can repeat, such as decorations. These generate diagonally.

$$, diagonal cave, ravine, dungeon, and decoration repetition occur with the seeds 289849025 and 1669320484. Mineshaft generation repeats vertically in the seeds -1171867832 and 1000686894.

Any seed calculated as 4294967296 × n + 1669320484 also generate maps with repeating features.

Notable Java Edition seeds
The following map seeds have, at one point or another, been used for generating official Minecraft maps and resources or otherwise significant community material.


 * The Java Edition demo world seed can be played in the full version by entering in the seed input.
 * The PC Gamer demo world seed can be played in the appropriate era by entering, all lowercase unlike the famous seed where the G is capitalized, in the seed input.
 * The seed for each title screen panorama are as follows:
 * The panorama used between Beta 1.8 Pre-release and 18w22c is either or, generated between Beta 1.6.6 and Beta 1.7.
 * The panorama used for Java Edition 1.13 is, which is the seed resulting from typing in as a seed, generated in snapshot 18w22a.
 * Java Edition 1.14 is, taken in 18w48a.
 * Java Edition 1.15 is, taken in 19w40a.
 * Java Edition 1.16 is, taken in 20w13a.
 * Java Edition 1.18 is, taken in 21w40a.
 * The panorama used for Java Edition 1.19 is, which is the seed resulting from typing in as a seed, generated in snapshot 22w15a.
 * Java Edition 1.20 is, taken in 23w14a.
 * The seed for the original pack.png file is, generated in Alpha v1.2.2. It can also be generated between Alpha v1.2.0 and Beta 1.7.3 with minor population differences.
 * The seed for the Skull on Fire painting is either or, generated in Alpha v1.1.2_01 or prior.
 * The seed used for the original Herobrine doctored screenshot is, generated in Alpha v1.0.16_02.
 * The seed used for the original Herobrine hoax livestream is, generated in Alpha v1.0.17_04.

Bedrock and Java Editions

 * Chunkbase Minecraft Apps: Online seed/map explorer tool
 * Minecraft Seeds on Reddit: Community-driven Minecraft Seeds
 * Minecraft Seeds: Community-driven Minecraft Seeds
 * LookingForSeed: Find Minecraft seeds from various categories
 * Minemap.org: High resolution maps for good seeds for the Java and Windows 10 (Bedrock) Edition

Java Edition only

 * Random Seed Reader: Local Java tool
 * Minecraft SeedHunt: Selected Seeds from various categories for Java 1.16
 * Minecraft Seeds Java Edition: New Seeds for 1.16.4 Version
 * SeedCracker: guess a seed from a multiplayer server
 * Seeder: Seed/map explorer tool and finder for Java

Zdroj Startwert Semilla (generación de mundo) Graine (génération de carte) 시드 Seed (wereldgeneratie) Ziarno generatora Semente (geração de níveis) Зерно Зерно (генерація світу) 种子（世界生成）