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The Binding of Isaac: Antibirth
An unofficial, fan-made expansion.
Created 5 years ago

This is an official post by the Antibirth team. Proof here.

Five years ago, a young boy took his first trip down into the basement, facing the endless threats below to escape from the murderous delusions of his loving mother. Three years later, he found himself facing the same predicament but with an even greater plague of horrors and peril. Very shortly afterward, a modest few among us decided that even this was not enough. In the two years since then, fate has worked tirelessly to place by far the most fearsome challenge yet in his path. This time, Isaac will face our free and fan-made The Binding of Isaac: Rebirth expansion, Antibirth. So what exactly is in store for him?

  • 2 new characters with unique playstyles
  • 90+ new collectible items to help Isaac fight
  • 18+ new trinkets to swap and strategize with
  • 80+ new enemies to face one after another
  • 16+ new bosses to kill or be killed by
  • 4000+ new rooms to explore and survive
  • A new secret final chapter for Isaac to endure
  • Bigger and greater secrets than ever before
  • Several new or enhanced features for local cooperative play
  • A nearly full and original new soundtrack, evocative of classic Isaac

The Binding of Isaac has had one of the most involved and robust communities of fans around since its initial release and has inspired countless players and developers with its peculiar sensibilities and creative blend of roguelike flavor. As its zealous modding community has proved, it's only natural that many among us would feel the urge to try to help carry the torch and make it partly our own, but Antibirth was the first and is presently the only Isaac mod to reach deep into the core of Rebirth to enable the depth and scope of a full expansion, aspiring even to the size of the official DLC, Afterbirth. If you've become as enraptured with Isaac as the rest of us and you still want more, we're here to provide our absolute best, and more of it than you've ever dreamed of, all for free.

With the nature of this mod's downloads, some antiviruses may act up when attempting to download Antibirth. The downloads from are completely safe to use - you should be able to download this mod without any issues.


x 3259
Haven't installed it yet but I know its good
Still the best existing isaac mod even after repentance came out
i need this mod on the 3DS edition
guys im the real Lazarus ill give u pills if you like and subscribe can we get 42,069 likes on this video for free fortnite bobux?
How do i install this on a macbook pro?
You can't, its only for windows. But you can use "wine" and some other sites to make you Mac kinda like windows. :/
Isaac: Mom, can we have TBOI Repenetance DLC at home?

Mom: No, we have TBOI Repenetance DLC at home

TBOI Repenetance DLC at home:
" an unofficial fanmade expansion "

not anymore lmao
you should probably get that checked out, you ass is supposed to stay on
Because repentance has double the content from antibirth, and it's official now.
repentance is out no more requiring this mod because its literally official now
but,this mod is free repentance is payd
yeah, repentance has like MUCH more content.

I've been excited to try antibirth for years and finally got the chance, it's amazing, couldn't ask for a better mod, lots of fun!
I somehow ,have like 2 copies of a file named isaac-ng I can't delete either of them help me pls
April 5, 2021 - 6 months ago

Repentance has been added as a DLC option for mods.