Minecraft Seed Map: Interactive Online Seed Viewer

What is a seed map

A seed map is a graphical representation of a Minecraft world generated from a specific seed. A seed is a number (or text converted to a number) that the game uses as the source of its randomness. The same seed always produces an identical world: the same biome layout, the same village positions, the same diamond veins, the same strongholds with their portals to the End.

A seed map lets you look at the whole world without exploring it. Within seconds you can see hundreds of square kilometers of terrain, exact structure coordinates, the biome layout and even the chunks where slimes spawn. It changes how you plan a base, a trip for diamonds or a speedrun route.

What seed maps are used for

• Planning a base - find a spot with a village, a forest, a river and mountains within 500 blocks of spawn.
• Hunting for structures - quickly locate a stronghold, a woodland mansion, an ocean monument or an ancient city.
• Speedrunning - the fastest routes to the End depend on finding a bastion and a stronghold within a few hundred blocks.
• Mob farms - finding slime chunks saves weeks of underground exploration.
• Videos and streams - creators pick seeds with scenic landscapes.
• Multiplayer servers - an admin can check that the map offers all the biomes before the world goes live.

Seed maps are not cheats or game mods. They are separate tools that replicate Minecraft's generation algorithm. They don't connect to your account, don't need a mod and don't change your world. You can use them safely alongside an official copy of Minecraft.

How Minecraft world generation works

A seed map can show a whole world in a second because Minecraft's terrain is procedural: the game runs several overlapping algorithms that deterministically generate every chunk from one number, the seed.

Perlin noise and the biome generator

The key ingredient of terrain generation is noise functions. Perlin noise is a mathematical function that returns a pseudorandom value for every pair of coordinates (x, z), changing smoothly across space. Minecraft stacks several layers of noise: height, humidity, temperature, erosion, continentalness and peaks. Since 1.18 the system uses six independent noise parameters for biomes alone.

From these values the game decides the biomes. A desert forms at high temperature and low humidity, while a lush cave needs high underground humidity. The rules are deterministic, so the same seed always gives the same biome layout.

Structure placement

Structures are placed by a separate algorithm. Each type has its own spacing: Minecraft divides the world into regions (for example 32×32 chunks) and rolls for each one whether the structure generates and where inside the region. The result depends only on the seed and the structure type, which is why a seed map can work out the positions of every village, stronghold and monument on a map 30,000 blocks across in a few seconds.

Best seed maps online

There are several good services for reading seeds, and each has its own strengths. Here are the main ones side by side.

Chunkbase - the market leader

Chunkbase (chunkbase.com) is the most popular Minecraft seed map. It supports every version from 1.7.2 to the latest, on Java and Bedrock. It's free, runs in the browser and needs no sign-up. It shows villages, trial chambers, ancient cities, bastions, Nether fortresses, strongholds, monuments, woodland mansions, pyramids, temples, shipwrecks and coral reefs. It also has a dedicated Slime Finder, Mushroom Biome Finder and Stronghold Finder. For more, see our Chunkbase guide.

MineAtlas - the classic

MineAtlas (mineatlas.com) is an older service that was popular in the 1.6-1.10 days. Its advantage is downloading a PNG of the whole world, which is handy for printing. The downside is limited support for 1.18+ (the new biome generation), so use it mainly for older versions.

AMIDST - an offline tool

AMIDST is a desktop application (Java) that reads your world's save or generates a seed preview offline. It works locally with no internet connection and exports PNGs up to 10,000×10,000 pixels. It supports Java Edition only, and it's a community-maintained project covering versions up to 1.21.

MCEdit and Cubiomes

MCEdit is a world editor with a seed preview function, and Cubiomes (a C/C++ library) is the foundation of most modern seed mappers: it replicates Minecraft's biome generation algorithm.

Service comparison

How to find structures with a seed map

The most common reason players use seed maps is locating structures. Each structure has its own placement algorithm, so here is how to find each one.

Villages

Villages generate in plains, taiga, savanna, desert and snowy plains biomes. Chunkbase lets you filter for villages only, and the first one is usually 200-600 blocks from spawn.

Strongholds and the End portal

Strongholds are special: a world has exactly 128 of them. The first ring lies 1,280-2,816 blocks from (0,0). Chunkbase shows the exact coordinates of all 128 strongholds, so there's no need to throw eyes of ender to hunt for one.

Ancient city

An ancient city generates only in the Deep Dark biome, at Y=-52. Chunkbase has a dedicated Ancient City layer. Going in takes the right gear and quiet movement because of the Warden.

Trial chambers and woodland mansions

Trial chambers (1.21) generate underground in regular biomes, usually several within 1,000 blocks of spawn. A woodland mansion is the rarest structure in the Overworld. It generates only in a dark forest, often 5,000-15,000 blocks from spawn.

Ocean monuments, bastions, pyramids

Ocean monuments generate only in deep oceans. Bastions and fortresses are in the Nether, and Chunkbase has a Nether mode that shows both. Desert pyramids (in deserts) and jungle temples are common, and you'll find them 500-1,000 blocks from spawn.

How to find biomes with a seed map

Besides structures, a seed map is great for locating rare biomes. Some biomes appear once per 10,000 blocks or even less often, and searching by hand can take weeks.

Mushroom Fields

Mushroom Fields is the rarest biome in the Overworld. It appears only as isolated islands in the middle of the ocean, usually 1,000-3,000 blocks from the mainland. Chunkbase has a "Mushroom Fields" filter in its biome panel, and it typically shows 1-3 islands within 10,000 blocks of spawn.

Deep Dark

Deep Dark generates beneath the surface in mountains and in regions with a thick layer of rock. On a seed map it shows up as gray patches at Y=-30. It's the biome with the most dangerous mobs in the game, so go in prepared for the Warden.

Lush Caves

Lush Caves are easy to spot from the surface: a flowering azalea signals that there's a lush cave underground. A seed map shows the entire underground biome, so you can plan your digging precisely.

Cherry Grove

Cherry Grove, added in Minecraft 1.20, is one of the best-looking biomes in the game. It generates in the mountains. Chunkbase shows it as pink clusters, and it's worth having one near your base.

Ice Spikes, Badlands, Sunflower Plains

Ice Spikes, Badlands and Sunflower Plains are all rare and worth a visit for their unique blocks. A seed map shows right away whether your base has a chance at a full "all biomes" set.

How to enter a seed in Minecraft

Once you've found an interesting seed, you type it into the game when you create a new world. The process is simple and the same in most versions.

Java Edition: step by step

1. Launch Minecraft Java Edition.
2. Click "Singleplayer".
3. Click "Create New World".
4. Scroll down and click "More World Options...".
5. Paste your seed (a number or text) into the "Seed for the World Generator" field.
6. Set the remaining options (Game Mode, Difficulty) and click "Create New World".

Bedrock Edition: step by step

1. Launch Minecraft Bedrock Edition.
2. Click "Play" → "Create New" → "Create New World".
3. Scroll down to the "Advanced" section.
4. Enter your seed in the "Seed" field.
5. Set the rest and click "Create".

How to check the seed of your current world

If you want to check the seed of a world you're already playing:

• Java Edition: type the /seed command in chat.
• Bedrock Edition: look at the "Seed" section in the world settings.
• Server: if you're an admin, /seed works exactly like in Java.

Java vs Bedrock: generation differences

Although both editions of Minecraft look alike, world generation differs enough that the same seed generates a different world in Java than in Bedrock. There are two reasons: the seed hashing algorithms differ, and so do small parameters of the biome generator.

Key differences

• Structure offset - village, stronghold and other structure positions are shifted between the editions.
• Slime chunks - different positions in Java and Bedrock, because the randomness is seeded differently.
• Spawn location - in Java the player spawns near (0,0), while in Bedrock the spawn is shifted to the nearest plains biome.
• Nether and the End - generated from the same seed as the Overworld, but differently in each edition.

Will a Java seed work in Bedrock?

Technically yes, because you can enter any number as a seed. But the world will be completely different. If someone shows you a seed on TikTok with a beautiful Cherry Grove right next to spawn in Java, you won't find that spot in Bedrock.

Chunkbase makes you choose the edition explicitly in the corner of the map. Always check that you're looking at the right one, so you don't waste time searching for a region that doesn't exist.

Minecraft versions and world generation

The world generation algorithm evolves with every major update. That means the same seed in Minecraft 1.12, 1.16, 1.18 and 1.21 produces different worlds. Here are the key milestones.

• 1.7.2 - a major biome overhaul (mesas, savannas, mountains). Seeds from 1.6 are incompatible.
• 1.13 - new oceans (warm, lukewarm, cold, frozen), coral reefs, shipwrecks.
• 1.16 - new Nether biomes and bastions. The Overworld is unchanged.
• 1.18 - the biggest change since 1.7.2: noise caves, aquifers, ore veins, a world height of 384 blocks. The Overworld looks completely different.
• 1.20 - Cherry Grove, sniffers, cherry wood.
• 1.21 - trial chambers underground (compatible with existing 1.20 seeds).

Best seeds of 2026

Here is a list of the best seeds for Minecraft 1.21.x, based on community popularity and our own testing with the seed map. Each entry lists its edition: the same number produces a different world in the other one.

Village at spawn plus diamonds under spawn

Ancient city near spawn

All biomes within 2,000 blocks

Cinematic and scenic seeds

Some seeds are visual legends and worth playing even without a speedrun or a farm in mind:

• 1257856026 (Java 1.21) - giant cliffs, a waterfall from a Cherry Grove.
• gimme seed (Bedrock) - a village in the mountains, ice spikes, an ocean monument.
• 3257840388504953 (Java 1.21) - spawn on top of a mountain with an ocean panorama.

Slime chunk finder

Slime chunks are special chunks (16×16 blocks) where slimes spawn below Y=40 regardless of light level and moon phase. Which chunks are slime chunks depends on the world seed, which is why seed maps with a dedicated filter (Slime Finder) are a huge help when you build a mob farm.

How the slime chunk algorithm works

For each chunk the game checks:

1. Take the world seed and the chunk coordinates (chunkX, chunkZ).
2. Apply a random seed (the slime seed) based on a deterministic formula.
3. If the result is 0 (mod 10), the chunk is a slime chunk.

Statistically, 10% of all chunks are slime chunks. With a seed map you can find clusters of 2-4 slime chunks side by side, an ideal spot for a slime farm.

How to build a slime farm

You'll find a detailed guide in our article on mob farms. In short:

1. Find a slime chunk on Chunkbase → Slime Finder.
2. In the game, use F3 (Java) or the debug settings (Bedrock) to confirm your position.
3. Dig out a 16×16 area at Y=30-40, light up the surroundings and leave the slime chunk dark.
4. Add a system to collect the slimes (water + hoppers).

More tools

These are our other seed and map tools:

• Seed search - browse hand-picked seeds with descriptions. Filter by version, edition and structures.
• Seed Finder - seed analysis with a slime chunk calculator.
• Chunkbase guide - how to use the most popular seed mapper.
• Bedrock locator - find your position from the bedrock pattern.
• Dynmap - a dynamic server map in the style of Google Maps (requires installing a plugin on the server).
• VoxelMap - a client mod with a minimap and waypoints.
• Xaero's World Map - a mod that renders a full map of the terrain you've explored.

FAQ: common questions

How does a seed map work?

A seed map recreates Minecraft's world generation algorithm outside the game. You enter a seed and a game version, and the tool deterministically calculates the biome layout and structure positions (villages, strongholds, ancient cities) and draws them on a draggable map, without launching Minecraft or modifying your world.

Is using a seed map cheating?

No. A seed map is an external tool that doesn't connect to the game, doesn't modify your world and gives you nothing beyond the information you'd get by exploring anyway. Mojang has never banned anyone for using Chunkbase or AMIDST. In speedruns, seed maps are allowed in Set Seed categories but banned in Random Seed Glitchless.

Does a seed map work with mods and modpacks?

Only partly. Mods and modpacks such as Better MC, Biomes O'Plenty or Terralith add new biomes and change how the world generates. Chunkbase shows vanilla biomes and structures, but not the biomes a modpack adds. In that case use the map preview built into the mod (for example JourneyMap or Xaero's World Map).

Will a seed map show caves and ores?

Most seed maps show only the surface and structures. To visualize caves and ore veins you need dedicated tools, for example the ore distribution calculator, which shows which Y levels to search for diamonds, netherite or amethyst.

Why doesn't my seed look like the screenshot?

The most common causes: you're playing a different version than the one in the screenshot, you're playing a different edition (Java vs Bedrock), or you have a mod or modpack that changes world generation. Always check the version and edition before pasting a seed.

Can I change the seed of an existing world?

No. The seed is saved when the world is created and can't be changed without regenerating the whole map. Some tools (for example MCEdit) can rewrite the seed in the save file, but chunks that haven't been generated yet will use the new seed while saved chunks keep the old one, which produces strange, mismatched terrain at the borders.

How many structures are in a Minecraft world?

It depends on the type. There are exactly 128 strongholds, and ocean monuments are effectively unlimited (placed within 32×32-chunk regions wherever the biome fits), as are villages (in matching biomes).