World seed

The world seed (or simply seed) is a value made up of character(s) (including negative or positive integers) that is used as the basis for generating every Minecraft world.^[1]

Compatibility

Seeds are somewhat compatible across editions, with terrain generation and biomes being the same. However, the placement of generated structures differs between Java Edition and Bedrock Edition.

World generation

Whenever the game has to generate a new world, it calls upon an algorithm known as Perlin noise. This algorithm outputs a pseudo-random value that is then used to determine the characteristics and features of the world. However, the algorithm always outputs the same value each time for a constant starting point (seed). Thus, the same seed generates the same terrain every time.

A world's seed is set when that world is created. By default, it is decided automatically, but it can also be set manually. Setting and reusing a seed from one world generates the same world. Either a number or a word/phrase can be used, including negatives. If a word/phrase is used, it is converted into a 32-bit integer using the .hashCode() method.

Whenever the world generation algorithm is updated (usually by adding new biomes to the game), the same seed no longer generates the same terrain. If the seed or generator changes in a saved world, new chunks are based on the new seed and no longer match those from the old seed. Deleted chunks can regenerate if the seed and generator remain the same, but changes if either the seed or generator changes. In fact, deleting chunks is sometimes done to let newly-introduced features appear in an old world; see Tutorials/Updating old oceans in 1.13 using MCEdit.

Because seeds are simply random values read into an algorithm and not actually names of different worlds, using a certain seed does not result in a world with any relevance to the value of that seed. For instance, using a biome name as the seed does not necessarily result in the creation of a world with primarily that biome, nor does it spawn the player within the said biome.

Determining the seed

In Java Edition, the player can enter the command /seed to view and copy 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.

In Bedrock Edition, the seed can be found and copied 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.

Notable seeds

This section is missing information about: What seeds are used for Bedrock Edition panoramas?.

 

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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 North Carolina in the seed input.
  • The Beta 1.3_01 PC Gamer demo world seed can be played in the appropriate era by entering glacier, all lowercase unlike the famous seed where the G is capitalized, in the seed input.
• The seeds for many of the panoramas used on the title screen are as follows:
  • The panorama used between Beta 1.8 Pre-release and 18w22c is either 2151901553968352745 or 8091867987493326313,^[2] generated between Beta 1.6.6 and Beta 1.7.
  • Bedrock Edition 1.2.0 uses 95475027, which is the same seed as the "Winding River" seed template generated before 1.18.0.
  • Java Edition 1.13 uses 1458140401, which is the seed resulting from typing 18w22a in as a seed, generated in snapshot 18w22a.
  • Java Edition 1.14 uses 2802867088795589976, taken in 18w48a.
  • Java Edition 1.15 uses -4404205509303106230, taken in 19w40a.
  • Java Edition 1.16 uses 6006096527635909600, taken in 20w13a.
  • Java Edition 1.18 uses 2151901553968352745, taken in 21w40a.
  • Java Edition 1.19 uses -1696067516, which is the seed resulting from typing thewildupdate in as a seed, taken in 22w15a.
  • Java Edition 1.20 uses 8554477380691140270, taken in 23w14a.
  • Java Edition 1.21.6 and Bedrock Edition 1.21.90 use 8819392414030687460, taken in 25w20a.
• The seed for the original pack.png file is 3257840388504953787. It was generated in Alpha v1.2.2^[3], It can also be generated between Alpha v1.2.0 and Beta 1.7.3 with minor population differences, and it's also the default seed for Minecraft: Bedrock Edition's New UI of Create New World when no seed is entered or created since Bedrock Edition beta 1.18.20.21. This seed spawns the player in a savanna biome at coordinates Position: -208, 65, 0.
• The seed for the Skull on Fire painting is either -6984854390176336655 or -1044887956651363087, generated in Alpha v1.1.2_01 or prior.^[4]
• The seed used for the original Herobrine hoax screenshot is 478868574082066804, generated in Alpha v1.0.16_02.
• The seed used for the original Herobrine hoax livestream is 3609313613745973624, generated in Alpha v1.0.17_04.
• Seeds used for the Legacy Console Edition tutorial worlds:
  • Each world is referred to by its respective Xbox 360 Edition update.
  • TU1 and TU3 used the seed 1171544198849424676
  • TU5 used the seed 6173462
  • TU7 and TU9 used the seed 96414766889474996
  • TU12 and TU14 used the seed 1227750481513469519
  • TU19, TU31, TU46, and TU69 were artificially-created and can't be generated by any seed.

Generation anomalies

Some seeds are known to cause strange effects in the world generation, due to their mathematical properties. See Anomalous world seeds for more information.

Technical

Realms

In Java Edition, a player can type /seed in the chat. In Bedrock Edition, the seed is not visible when playing on Realms, but can be seen by downloading the world.

General

If the seed contains characters other than numbers (except the first character, which can be "-" or "+") or not a Java long number (an integer between -2⁶³ and 2⁶³-1), the Java String.hashCode() 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 int datatype used. Number seeds or a default world seed must be used to access the full set of possible worlds (which is 2⁶⁴, or 18,446,744,073,709,551,616, or 18.4 quintillion).

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 (64-bit seeds) generate the same terrain and biomes in both Java and Bedrock Edition although with differing structures, decorator placements, carver caves, and mob spawns.

Videos

History

This section is missing information about: Were the seeds always 64-bit integers, or they were 32-bit in older (pre-Infdev) versions?.

 

Please expand the section to include this information. Further details may exist on the talk page.

This section needs to be updated.

 

Please update this section to reflect recent updates or newly available information.
Reason: Bedrock experimental changes

References

External links

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

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

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