Valheim World Generator

What it is

Valheim World Generator is a website by wd40bomber7 that reproduces Valheim's world generation algorithm in JavaScript. You feed it a seed (text or .fwl file) and it generates the full map image with every point of interest visible.

It supports game versions from launch to the current patch — the site has a dropdown to pick "made on or after 2/2/2026 (Minor Update)" vs older versions, because worldgen changes between patches can shift locations.

It's the reference tool every Valheim player uses before committing to a world or when someone shares a good seed.

What it solves

Valheim generates the map procedurally but shows you nothing in-game. You have to explore to discover biomes, bosses, and traders. That's part of the game — the first exploration with the guiding raven is excellent — but it also means:

• Terrible spawns exist. Some seeds drop the player on a tiny island with no Black Forest in sight; takes hours of boating to advance.
• Haldor (merchant) can be 5,000 meters from spawn. You don't know until you find him.
• For multiplayer co-op, you want a world with reasonably accessible bosses. Rolling seeds blindly wastes time.

valheim-map.world solves that: in 30 seconds you see whether a seed gives you:

• Black Forest near spawn.
• Haldor at a reasonable distance (ideally < 3,000m).
• Hildir (Mistlands trader) in a useful spot.
• Swamp with accessible crypts.
• Mountain with a dragon altar.
• Plains, Mistlands, and Ashlands distributed for progression.

If a seed doesn't convince you, generate another and check. Iterate until you find a good one without playing.

Differentiation

No real competitor. valheim-map.world is the canonical seed viewer for the game since 2021, maintained by its original author, and the only serious option.

There are alternative sites (some "shape AI valheim map generator" SEO spam) but none reproduces the algorithm with valheim-map.world's accuracy. The technical achievement is impressive — the author reverse-engineered worldgen without source access.

Vs. exploring in-game: exploring is the experience the game designed. valheim-map.world is for players who prefer knowing what they'll find before committing to a long playthrough.

What people use it for

Picking a seed before starting. Generate 5-10 seeds, check which has the best boss distribution, start with the winner.

Validating shared seeds. Someone on Reddit or Discord says "this seed is excellent". Before copying, preview it to confirm.

Planning boss run routes. Knowing where the Eikthyr, Elder, Bonemass, etc. altars sit, you plan the order and place portals in advance.

Hunting specific locations. Want a seed with many crypts near spawn, or a continental Ashlands cluster without crossing ocean: the site lets you filter.

Recovering a seed from an existing world. The "Seed Extractor" function reads your .fwl (world file in worlds_local/) and tells you the seed. Useful when you lost the original code.

Multiplayer planning. The group picks the seed beforehand by viewing the map, everyone knows where they're going, avoids the "Haldor's 4,000m away, we wasted the trip" 20 hours in.

Who this tool is not for

If you like discovering the world blind: the site spoils it. Some players prefer not using seed viewers to keep the surprise factor.

If you play a single seed forever: time already spent on that seed, no need to check others. valheim-map.world is for selection, not daily gameplay.

If you mod with Better Continents: your world wasn't generated by vanilla worldgen, valheim-map.world doesn't reflect it.

If you play on a public server where you don't pick the seed: irrelevant to you.

How it works in practice

1. Go to valheim-map.world.
2. In the dropdown, pick the game version you'll play (typically the most recent).
3. Type a new seed or paste a known one (e.g., HHcLC5acQt).
4. Click "Generate" or equivalent. The map renders in seconds.
5. Inspect the map: hover over POIs to see tooltips (Haldor merchant, boss altars, crypts, etc.).
6. If you like it, write down the seed. If not, generate another.
7. To extract the seed of an existing world: upload the .fwl from valheim-map.world/getseed.html.

When you finally start Valheim, in "New World" paste the exact seed in the "Seed" field. The game generates the same world you saw in the viewer.

Honest limitations

Spoiler tool. By nature, seeing the map removes exploration surprise. If you value that, skip it.

Lag after big patches. When Iron Gate ships a patch touching worldgen (Ashlands, Call to Arms), wd40bomber7 has to update the algorithm. There are days/weeks of gap where previewed seeds don't reflect current game exactly.

No dynamic events preview. Things that appear as you progress (Fuling raids, Ashlands volcanic events, etc.) don't show. Only static POIs.

Dense UI. Lots of info on screen. First time can be overwhelming.

Best on desktop. There's a mobile version but zoom and tooltips are more comfortable on a big screen.

Not official. If Iron Gate changes worldgen in a way that breaks the algorithm, the site goes stale until the author fixes it. That's happened a few times.

Getting started

1. Open valheim-map.world in any desktop browser.
2. In the top bar, make sure the game version matches yours.
3. Generate a random seed or paste one you want to evaluate.
4. Inspect: Black Forest near spawn? Haldor accessible? Plains/Mistlands/Ashlands well distributed?
5. If you like it, write down the seed. If not, repeat.
6. In Valheim, "New World" → paste the exact seed → generate → start.

To understand each POI in the viewer, valheim-map.world/about.html has a full legend.