
SeedChecker
A Minecraft mod to speed up checking Minecraft seeds by hand.
Motivation
There are a multitude of programs that help you find rare Minecraft seeds. However, a lot of them require a lot of manual labor, by going into Minecraft and loading the world by hand and checking, if the seed meets the requirements.
This tool speeds up the process by allowing you to quickly generate worlds with the specified seeds
Setup
- In the main menu, click the button "Open seed list" (or open
.minecraft/seedchecker/seedlist.txt) - Add your seeds into the text editor (each seed a new line)
- Save the list
- Press the keybind O
Now you should load into a world and it will have the first seed that you specified in the file
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You can also add text as a seed, just like in the vanilla GUI
Pressing O again will generate a world with the next seed in the file.
Once a world is generated, the first seed in the file will be removed, so restarting the game will keep your progress!
Config
Set specific world configuration in .minecraft/config/seedchecker.json
{
"difficulty": "EASY", // EASY, NORMAL, HARD, PEACEFUL
"worldType": "normal", // normal, flat, amplified, single_biome
"hardcore": "false", // true, false
"worldFolderName": "SeedChecker World", // Anything you want!
"allowCommands": "true", // true, false
"gameMode": "CREATIVE" // SURVIVAL, CREATIVE, SPECTATOR, ADVENTURE
}
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You can keep the game running while changing the config, it will automatically load once you save
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.8
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
- Ships as SeedChecker-1.0.jar — drop this file into the mods folder
- Download size: 2.0 MB
- Download link checked 20 Sept 2026 — working
These come from our own check of the pack file, not from the source page.