You can't unless you do some mubo jumbo coding or something like that, You can on Tmodloader
Terraria Community Forums
ItzDaBash
OptiPri
Oh.
Well then...
Cause I found a neat world that you spawn in on a sky lake so... I thought people might have wanted to know the seed.
Well then...
Cause I found a neat world that you spawn in on a sky lake so... I thought people might have wanted to know the seed.
Snickerbobble
I think this might help: https://terraria.gamepedia.com/World_Seed
Kazzymodus
If you have experimental features on (and have had it on since you created the world), you can read the seed. If you haven't, then you can't, not even retroactively.
Snickerbobble
The world can at least be uploaded and downloaded by others.. but this is probably much more of a hassle. But still possible to share at least!