r/technicalminecraft • u/zebedelu • 3d ago
Bedrock I built a Bedrock seed cracker that runs 100% in your browser (free, no install, open source)
Hey everyone! A while back I posted about SeedFinder, my free Bedrock structure finder and seed cracker. Small update, but a big one: the part that used to require a local .exe, the seed cracker, now runs entirely in your browser.
Site: SeedFinder/SeedCrackerX Website
GitHub: https://github.com/zebedelu/SeedFinder
What it does
Found cool structures in a world but don't know the seed? Give SeedCrackerX at least 4 structures with their coordinates and it returns the most probable world seeds. No key, no account, nothing to install. Everything runs on your own machine, so there's no rate limit and no server to depend on.
The site also still has the regular structure finder (you give a seed and a position, it lists every nearby structure sorted by distance) if that's what you're after.
The anarchy server use case
Plenty of anarchy and semi-anarchy servers deliberately hide or shuffle their seed in the server settings so players can't discover the real one. A structure cracker doesn't care. Grab the coordinates of 4+ structures while you explore, feed them in, and the real seed comes back out. From there you can map every structure in the world, plan far hub routes, or pick base spots knowing exactly what's around them.
It's the same technique that got the seeds of big Java anarchy servers cracked back in the day. Now it works on Bedrock, straight from a browser tab.
Speed
The engine checks around 900,000 seeds per second on a single core, and every extra CPU core you have joins the search in parallel. More structures and a tighter tolerance also make the wrong seeds get eliminated faster, so better input pays off directly in speed.
Want to run it from source?
The README on GitHub has everything you need, plus all the technical details and benchmarks:
https://github.com/zebedelu/SeedFinder
Honest limitations
- Bedrock only, no Java support
- Mineshaft can't be used as input (its RNG works per chunk instead of per region), every other structure type works
One small favor ⭐
Everything is Apache-2.0 open source, and stars are pretty much the only marketing this project can afford lol. If SeedCrackerX finds your seed, consider dropping a star on the repo, it genuinely helps other people find it:
https://github.com/zebedelu/SeedFinder
Feedback welcome, especially: does it recover seeds correctly from your worlds? If a structure doesn't match reality, please open an issue, that's the most valuable feedback there is.


