View source for Minecraft:World seed

{{for|other uses|Seeds}}
The '''world seed''' (or simply '''seed'''; referred to as '''seed for the world generator''' in-game) is a value made up of character(s) (including negative or positive integers) that is used as the basis for [[Minecraft:world generation|generating every ''Minecraft'' world]].<ref>[https://web.archive.org/web/20120307165955/https://www.mojang.com/2011/02/a-short-demystification-of-the-map-seed/ A Short Demystification of the 'Map Seed'] - Jens Bergensten on Mojang.com; February 23, 2011</ref>

== Compatibility ==
Seeds are somewhat compatible between ''[[Minecraft:Java Edition|Java]]'' and ''[[Minecraft:Bedrock Edition]]'', with terrain generation and biomes being the same. However, the placement of generated [[Minecraft:structure]]s differs between these editions.

== World generation ==
{{main|World generation}}

Whenever the game has to generate a new world, it calls upon an algorithm known as ''{{w|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 <code>.hashCode()</code> 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 [[Minecraft: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 [[Minecraft: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 [[Minecraft: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.

{{Calculator|seedHashcode}}

== Determining the seed ==
{{IN|java}}, the player can enter the [[Minecraft:command]] {{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}}, the seed can be found and copied on the [[Minecraft:World Options|world options]] screen. There are also [[Minecraft: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.

== Changing the seed ==
{{Exclusive|bedrock|section=1}}
The seed of a world can be changed at any time using [[Minecraft:World template|world templates]]. By exporting a world and unzipping the file, one can place a [[Minecraft:manifest.json]] file in the world's folder with the <code>world_template</code> type, and <code>allow_random_seed:true</code>. When zipped into a <code>.mctemplate</code> file, it can be imported into the game. It appears under the {{UI|Create new world|Owned by me|Imported}} list of world templates, which, when selected opens the [[Minecraft:Create New World|Create new world]] screen with the option to change the seed. However, this will not create a new world – all saved chunks are still in the world, meaning that only the world seed is changed; even [[Minecraft:achievements]] can still be earned. This also allows various other world creation options to be changed, such as flat world, bonus chest, Hardcore, and starting map, clear all player data, or even lock the world in older versions.

== Notable seeds ==
{{info needed section|What seeds are used for Bedrock Edition panoramas?}}
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 {{cd|North Carolina}} in the seed input.
** The [[Minecraft:Java Edition Beta 1.3_01|Beta 1.3_01]] PC Gamer demo world seed can be played in the appropriate era by entering {{cd|glacier}}, all lowercase unlike the famous seed where the G is capitalized, in the seed input.
* The seeds for many of the [[Minecraft:panorama]]s used on the [[Minecraft:Title Screen|title screen]] are as follows:
**The panorama used between [[Minecraft:Java Edition Beta 1.8 Pre-release|Beta 1.8 Pre-release]] and [[Minecraft:Java Edition 18w22c|18w22c]] is either {{cd|2151901553968352745}} or {{cd|8091867987493326313}},<ref>{{reddit|hthrmk}}</ref> generated between [[Minecraft:Java Edition Beta 1.6.6|Beta 1.6.6]] and [[Minecraft:Java Edition Beta 1.7|Beta 1.7]].
** Bedrock Edition 1.2.0 uses {{cd|95475027}}, which is the same seed as the "Winding River" [[Minecraft:seed template]] generated before [[Minecraft:Bedrock Edition 1.18.0|1.18.0]].
** Java Edition 1.13 uses {{cd|1458140401}}, which is the seed resulting from typing {{cd|18w22a}} in as a seed, generated in snapshot [[Minecraft:18w22a]].
** Java Edition 1.14 uses {{cd|2802867088795589976}}, taken in [[Minecraft:18w48a]].
** Java Edition 1.15 uses {{cd|-4404205509303106230}}, taken in [[Minecraft:19w40a]].
** Java Edition 1.16 uses {{cd|6006096527635909600}}, taken in [[Minecraft:20w13a]].
** Java Edition 1.18 uses {{cd|2151901553968352745}}, taken in [[Minecraft:21w40a]].
** Java Edition 1.19 uses {{cd|-1696067516}}, which is the seed resulting from typing {{cd|thewildupdate}} in as a seed, taken in [[Minecraft:22w15a]].
** Java Edition 1.20 uses {{cd|8554477380691140270}}, taken in [[Minecraft:23w14a]].
** Java Edition 1.21.6 and Bedrock Edition 1.21.90 use {{cd|8819392414030687460}}, taken in [[Minecraft:25w20a]] and [[Minecraft:Bedrock Edition Preview 1.21.90.26|Preview 1.21.90.26]], respectively.
* The seed for the original pack.png file is {{cd|3257840388504953787}}, taken some time before the release of [[Minecraft:Java Edition Alpha v1.2.2|Alpha v1.2.2]]<ref>{{reddit|iocx6f}}</ref>. It generates most correctly from [[Minecraft:Java Edition Alpha v1.2.0|Alpha v1.2.0]] to [[Minecraft:Java Edition Alpha v1.2.5|Alpha v1.2.5]], but can also be generated up to [[Minecraft:Java Edition Beta 1.7.3|Beta 1.7.3]] with minor population differences. It's also the default seed for Bedrock Edition's New UI of Create New World when no seed is entered or created since [[Minecraft:Bedrock Edition beta 1.18.20.21]]. This seed spawns the player in a [[Minecraft:savanna]] biome at coordinates {{cd|Position: -208, 65, 0}}.
* The seed for the Skull on Fire [[Minecraft:painting]] is either {{cd|-6984854390176336655}} or {{cd|-1044887956651363087}}, generated in [[Minecraft:Java Edition Alpha v1.1.2_01|Alpha v1.1.2_01]] or prior.<ref>{{reddit|iqg3ey}}</ref>
* The seed used for the original [[Minecraft:Herobrine]] hoax screenshot is {{cd|478868574082066804}}, generated in [[Minecraft:Alpha v1.0.16_02]].
* The seed used for the original [[Minecraft:Herobrine]] hoax livestream is {{cd|3609313613745973624}}, generated in [[Minecraft:Alpha v1.0.17_04]].
* Seeds used for the [[Minecraft:Legacy Console Edition tutorial]] worlds:
** Each world is referred to by its respective [[Minecraft:Xbox 360 Edition]] update.
** [[Minecraft:Xbox 360 Edition TU1|TU1]] and [[Minecraft:Xbox 360 Edition TU3|TU3]] used the seed {{cd|1171544198849424676}}
** [[Minecraft:Xbox 360 Edition TU5|TU5]] used the seed {{cd|6173462}}
** [[Minecraft:Xbox 360 Edition TU7|TU7]] and [[Minecraft:Xbox 360 Edition TU9|TU9]] used the seed {{cd|96414766889474996}}
** [[Minecraft:Xbox 360 Edition TU12|TU12]] and [[Minecraft:Xbox 360 Edition TU14|TU14]] used the seed {{cd|1227750481513469519}}
** [[Minecraft:Xbox 360 Edition TU19|TU19]], [[Minecraft:Xbox 360 Edition TU31|TU31]], [[Minecraft:Xbox 360 Edition TU46|TU46]], and [[Minecraft:Xbox 360 Edition TU69|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 [[Minecraft:Anomalous world seeds]] for more information.

== Technical ==

=== Realms ===
{{IN|java}}, a player can type {{cmd|seed}} in the chat. {{IN|bedrock}}, 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 digits (except the first character, which can be "-" or "+") or falls out of range of a Java {{cd|long}} number (an integer between −2<sup>63</sup> and 2<sup>63</sup>−1), the Java <code>String.hashCode()</code> function is used to generate the seed number. This restricts ''Minecraft'' to a subset of the possible worlds to 2<sup>32</sup> (or 4,294,967,296), due to the {{cd|int}} datatype being used. A numeric seed or a random (blank) world seed must be used to access the full set of possible worlds (which is 2<sup>64</sup>, 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{{Verify|It seems that all seeds have the same terrain and biomes across editions.}} (64-bit seeds) generate the same terrain and [[Minecraft:biome]]s in both ''Java'' and ''Bedrock Edition''. However, [[Minecraft:structure]]s, [[Minecraft:feature]]s (i.e. decorators), [[Minecraft:carver]] caves, and [[Minecraft:Mob spawning|mob spawns]] will generate differently.

==Videos==
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{{yt|CSa5O6knuwI}}

== History ==
{{info needed section|Were the seeds always 64-bit integers, or they were 32-bit in older (pre-Infdev) versions?}}
{{needs update|section=true|Bedrock experimental changes}}

=== ''Java Edition'' ===
{{HistoryTable
|{{HistoryLine|java pre-classic}}
|{{HistoryLine||rd-160052|Added a simple level generator.}}
|{{HistoryLine|java classic}}
|{{HistoryLine||0.0.12a|Added a new level generator.}}
|{{HistoryLine||August 25, 2009|link=wordofnotch:170887079|Showed another new level generator, which generates cliffs more commonly.}}
|{{HistoryLine|java indev}}
|{{HistoryLine||0.31|dev=20091223-1457|Isometric level rendering screenshot added.}}
|{{HistoryLine|||dev=20100106-2158|The player can now select island, floating, flat, or original as the level type when generating a world.
|Players can also select square, long, or deep as the level shape.
|Players can also select small, normal, or huge as the level size.}}
|{{HistoryLine|||dev=20100107-1851|Deep floating maps now have layers of islands.
|Players can now select a level theme; normal or hell.}}
|{{HistoryLine|||dev=20100110|Islands now generate with more sand.}}
|{{HistoryLine|||dev=20100113-2015|Oceans now generate with infinite water.}}
|{{HistoryLine|||dev=20100122-1708|Water now spawns naturally above sea level and on floating islands.}}
|{{HistoryLine|||dev=20100122-2251|Caves are now less flooded.}}
|{{HistoryLine|java infdev}}
|{{HistoryLine||20100227-1414|Terrain-breaking change to world gen: using any given seed on older versions now generates a different world.
|World generation has been greatly simplified (with the removal of sand, blobs) in order to make infinite world generation implementation easier to work with.}}
|{{HistoryLine||20100227-1433|Brick pyramid generation changed - they now always come to a single point at the top, rather than sometimes being truncated, resulting in "brick square frusta".}}
|{{HistoryLine||20100313|Oceans are considerably larger than before.{{check the code}}}}
|{{HistoryLine||20100320|Reimplemented primitive [[Minecraft:ore (feature)|ore blob]] generation, in which they spawn as scattered, single blocks.
|Reimplemented [[Minecraft:tree]] generation.}}
|{{HistoryLine||20100325-1545|Ore blob generation has been changed to the modern generation type. However, a float is used in their generation, causing their generation to [[Minecraft:Java Edition distance effects/Historical effects|break down at excessive distances.]]
|Added [[Minecraft:cave]]s. They generate through all blocks, not just terrain blocks.}}
|{{HistoryLine||20100327|Terrain-breaking change to world gen: using any given seed on older versions now generates a different world.
|World generation has been significantly overhauled, which is visually very obvious.
|Removed caves.
|Removed [[Minecraft:random patch]]es of flowers.
|The large stone wall at 33,554,432 no longer generates. Instead, the [[Minecraft:Far Lands]] generate at 12,550,824.}}
|{{HistoryLine||20100413|All trees are now large trees.
|[[Minecraft:Sand]] and [[Minecraft:gravel]] now generate with the world again.}}
|{{HistoryLine||20100420|Terrain-breaking change to world gen: using any given seed on older versions now generates a different world.
|World generation seems considerably less mountainous.}}
|{{HistoryLine||20100608|All trees are now small trees again - big trees do not generate.}}
|{{HistoryLine||20100611|Terrain-breaking change to world gen: using any given seed on older versions now generates a different world.
|Terrain now appears to come in large islands.
|Terrain can now generate high enough to be higher than the world height limit, causing it to be cut off.
|[[Minecraft:Monolith|Monoliths]] now have the potential to generate.
|The amount of trees that generate appears to be different now.}}
|{{HistoryLine||20100616-1808|Minor terrain-breaking change to world gen.
|Coastlines are now more gradual, resulting in smaller "ocean" areas.
|Reimplemented caves.
|Random patches of flowers and [[Minecraft:mushroom]]s now generate.
|[[Minecraft:Spring]]s now generate.
|[[Minecraft:Lava]] now naturally generates, although how it does so exactly is unknown.}}
|{{HistoryLine|java alpha}}
|{{HistoryLine||v1.2.0|dev=preview|Terrain-breaking change to world gen: using any given seed on older versions now generates a different world.}}
|{{HistoryLine|java beta}}
|{{HistoryLine||1.3|It is now possible to manually determine the seed upon world creation.
|Any 64-bit signed integer value can be entered and will create a world with that seed, ''unless'' the number is 0, in which case the world will be created with a random seed as though no seed was provided.
|A world with the seed 0 can be created by providing a string that hashes to 0, such as {{code|creashaks organzine}} or {{code|pollinating sandboxes}}.<ref>https://www.minecraftforum.net/forums/minecraft-java-edition/seeds/299287-i-was-just-curious-about-seed-0-we-found-it</ref>}}
|{{HistoryLine||1.8|dev=Pre-release|Terrain-breaking change to world gen.
|The debug screen now displays the seed number.}}
|{{HistoryLine|java}}
|{{HistoryLine||1.2.1|dev=12w03a|Minor terrain-breaking change to world gen.}}
|{{HistoryLine|||dev=12w07a|Seeds can no longer change biomes in existing worlds due to the Anvil file format.}}
|{{HistoryLine|||dev=?|Multiplayer servers no longer send the seed to clients.}}
|{{HistoryLine||1.3.1|dev=12w18a|Due to singleplayer becoming multiplayer, the world's seed is no longer displayed on the debug screen.}}
|{{HistoryLine|||dev=12w21a|Added {{cmd|seed}}, which displays the current world seed.}}
|{{HistoryLine||1.7.2|dev=13w36a|Terrain-breaking change to world gen with the introduction of many new biomes.}}
|{{HistoryLine||1.13|dev=18w06a|World generator rewritten in a mostly non-breaking way.}}
|{{HistoryLine||1.18|dev=1.18 Experimental Snapshot 1|Terrain-breaking change to the world gen with the introduction of multinoise, terrain noise, biome builders, and new caves.
|Seed limit is now 48-bit.<ref name="MC-236650">{{bug|MC-236650}}</ref>}}
|{{HistoryLine|||dev=1.18 experimental snapshot 2|World generator rewritten in a non-breaking way.}}
|{{HistoryLine|||dev=21w41a|Replaced the random number generator used in world generation, which reverted the seed limit back to 64-bit.<ref name="MC-236650"/>
|Seeds have been reshuffled due to this change. Worlds no longer look like they did in previous snapshots.}}
|{{HistoryLine|||dev=21w43a|Seeds have been reshuffled again. Worlds no longer look like they did in previous snapshots.}}
|{{HistoryLine||1.18.2|dev=22w03a|The seed "0" (zero) can now be used normally; entering it will generate a world with this seed, rather than a random seed.
|Any spaces before or after a provided seed is now trimmed.}}
}}

=== ''Bedrock Edition'' ===
{{HistoryTable
|{{HistoryLine|pocket alpha}}
|{{HistoryLine||v0.1.0|Added seeds (32 bit).}}
|{{HistoryLine||v0.7.2|The seed for each world is now displayed in the [[Minecraft:world selection menu]] when the "Edit" button is pressed.}}
|{{HistoryLine||v0.9.0|dev=build 1|Terrain-breaking change to world gen: using any given seed on older versions now generates a different world.}}
|{{HistoryLine||v0.11.0|dev=build 7|The seed is now displayed at the top of the screen in development versions while the player is in a world.}}
|{{HistoryLine|||dev=?|Before this update, the game would use a Unix timestamp as the seed if no other seed was typed. From this update onwards, it uses a random number generation.}}
|{{HistoryLine|bedrock}}
|{{HistoryLine||1.18.0|dev=beta 1.18.0.20|Terrain-breaking change to the world gen. Revamp [[Minecraft:Cave]]s, [[Minecraft:Mountains]], and [[Minecraft:Terrain]] height system.}}
|{{HistoryLine|||dev=beta 1.18.0.22|Replaced the random number generator used in world generation, resulting in different terrain being generated using same seed.}}
|{{HistoryLine|||dev=beta 1.18.0.24|Seeds have been reshuffled again. Worlds no longer look like they did in previous betas.}}
|{{HistoryLine||1.18.30|dev=beta 1.18.20.21|Worlds can now be created with 64-bit seeds.
|Single-digit seeds such as "0" can now be used normally.}}
}}

=== Legacy Console Edition ===
{{HistoryTable
|{{HistoryLine|legacy console}}
|{{HistoryLine||xbox=TU0|xbone=CU1|ps3=1.00|psvita=1.00|ps4=1.00|wiiu=Patch 1|switch=1.0.1|Added seeds (64-bit).}}
|{{HistoryLine||xbox=TU3|Added a seed display to the level load screen (requires existing levels to be saved out again to add the display).}}
|{{HistoryLine||xbox=TU5|Terrain-breaking change to world gen.}}
|{{HistoryLine||xbox=TU12|Minor terrain-breaking change to world gen. Biome info is now saved to worlds instead of recalculated when biome generation changes.}}
|{{HistoryLine||xbox=TU31|xbone=CU19|ps3=1.22|psvita=1.22|ps4=1.22|wiiu=Patch 3|Terrain-breaking change to world gen.}}
|{{HistoryLine||xbox=TU54|xbone=CU44|ps3=1.52|psvita=1.52|ps4=1.52|wiiu=Patch 24|switch=1.0.4|Added Biome Scale slider and Find Balanced Seed option.}}
}}

=== ''New Nintendo 3DS Edition'' ===
{{HistoryTable
|{{HistoryLine|3ds}}
|{{HistoryLine||0.1.0|Added seeds (32 bit).}}
}}

== References ==
{{Reflist}}

== External links ==
=== Bedrock and Java Editions ===
* [http://chunkbase.com/apps/ '''Chunkbase Minecraft Apps''': Online seed/map explorer tool]
* [https://www.reddit.com/r/minecraftseeds/ '''Minecraft Seeds on Reddit''': Community-driven Minecraft Seeds]
* [https://minecraft-seeds.net '''Minecraft Seeds''': Community-driven Minecraft Seeds]
* [https://lookingforseed.com '''LookingForSeed''': Find Minecraft seeds from various categories]

=== Java Edition only ===
* [https://github.com/thedarkfreak/Minecraft-Save-Seed-Reader/wiki '''Random Seed Reader''': Local Java tool]
* [https://seedhunt.net/advanced '''Minecraft SeedHunt''': Selected Seeds from various categories for Java 1.16]
* [http://minecraftgames.co.uk/seeds/ '''Minecraft Seeds Java Edition''': New Seeds for 1.16.4 Version]
* [https://github.com/KaptainWutax/SeedCracker '''SeedCracker''': guess a seed from a multiplayer server]
* [https://www.mcseeder.com/ '''Seeder''': Seed/map explorer tool and finder for ''Java'']

== Navigation ==
{{Navbox Java Edition technical|general}}
{{Navbox Bedrock Edition}}

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[[Minecraft:es:Semilla (generación de mundo)]]
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