Tools / Valheim
Valheim Launch Command Generator
Generate a dedicated-server launch command, UDP firewall rules, and the world/seed handoff steps you need before inviting players.
What this tool is (and is not)
This generates the dedicated-server startup command, matching UDP firewall rules, and a world/seed handoff checklist. The seed field is carried into the checklist as-is - creating a world from a seed happens in the game, and previewing a seed's map needs the game's own world generator. For reading an existing world's seed out of its .fwl file, use the World & Modpack Doctor.