Valheim seed finder

Start a new world, choose "Create new world" and type or paste the seed into the seed field before you create it. The same seed always gives the same world, as long as the game version is the same (these were checked against Valheim 1.0.17).

By measuring them. 120,000 random seeds were generated with the same world generator the game uses, and for each the distances from the spawn to the boss altars and traders, the biomes around the spawn and the size of the landmass were recorded. The lists are the best of those, by the rule written under each one.

Yes: the seed finder filters all the measured seeds by the distance to each boss, to Haldor, to each biome and to copper, tin, iron and silver, and by the size of your starting landmass.

Boss altars, traders and biomes are the game's own positions. Ore is worked out from the game's placement rules, the same way as the ore layer of the seed map, so it is approximate: the game may have blocked a spot, and a few positions may be missing. Iron here means the muddy scrap piles of the Swamp. A distance is left out when there is no deposit within 4 km.

The game changed how it places things over the years, so a seed made for an older version can give a different world now. Worlds created before the current version keep their old layout; new worlds follow the current rules.