Make a hardcore Minecraft server

Hardcore mode makes death permanent: a player who dies cannot respawn. The Minecraft Wiki says Hardcore cannot be enabled for a world that already exists, so the usual route on a server is a fresh world with Hardcore on.

Checked against Minecraft 26.3, October 2026.

How hardcore works on a server

• It applies to created worlds only. The Minecraft Wiki describes the hardcore line in server.properties as enabling hardcore mode on worlds the server creates, and its Hardcore page says Hardcore cannot be enabled for existing worlds. That page describes bringing Hardcore to a server by uploading an existing Hardcore world.
• Death ends the run. The game's own text describes Hardcore as Survival Mode where you cannot respawn if you die, and its death screen offers Spectate World or Title Screen. The Minecraft Wiki says a player who chooses to spectate is put in Spectator mode.
• Difficulty is locked to Hard. The game's own text calls Hardcore "Survival Mode locked to 'Hard' difficulty", and the Minecraft Wiki agrees.
• Operators can change game modes. Operators can change a player's game mode with /gamemode.

Make a new hardcore world

1. Open the Backups tab and click Create backup, so your current world is safe.
2. On the Console tab, click Stop and wait for Offline.
3. Open the Config Editor. In the World section, change World folder to a new name such as hardcore. Its help text says changing it starts a new world and the old folder stays on disk.
4. Optional: in the same section, fill in World seed to use a seed you already know. Leave it empty for a random one.
5. In the Gameplay section, switch Hardcore on.
6. Click Save changes.
7. Click Start on the Console tab. The server generates the new world in the new folder on its first start.

Your old world stays in its folder. To go back to it, set World folder back to the old name and restart. The Minecraft Wiki says that if a directory at that path exists and is a valid world, the server loads it. Find your world seed shows how to read the seed of the world you are leaving.

Change a player's game mode

To change a player's game mode, send this on the Console tab, with the player's name in place of Steve:

gamemode survival Steve

The syntax is gamemode <gamemode> [<target>]. The Minecraft Wiki's Hardcore page does not say whether setting Survival lets a player who died in Hardcore carry on playing, so do not count on it.

Turning hardcore on in an existing world

The Minecraft Wiki says Hardcore cannot be enabled for an existing world. It also notes that external NBT editors can change the hardcore tag in level.dat, which the game itself does not offer. If you try it, make a backup first and read Edit level.dat and player data with an NBT editor. A fresh world is the safe route.

If it does not work

• Players still respawn after dying. If the world was created before you turned Hardcore on, the Minecraft Wiki says Hardcore cannot be enabled for it. Change World folder to a new name so the server generates a fresh world.
• Nothing changed after saving. Restart the server. The Config Editor's confirmation says the change needs a restart to apply.
• You want to start over later. See Reset your world and start fresh.