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The Binding of Isaac: Antibirth
An unofficial, fan-made expansion.
Created 6 months 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.

14083

downloads
x 2002
The website brings you to a download with malicious ads. That sucks.
i need help when I play it everything works fine but when I get to the parts where the doors to the new route thing they don't appear is there some type of unlock or requirement needed to access The New Final Chapter?
You have to defeat all of the new bosses in normal floors to unlock the secret exit( the new path )
Do you have plans for Afterbirth and Afterbirth+?
Well... I expected this. Its just like I thought, this isn't going to become super popular. "12,535 downloads isn't popular?!" Well, I guess it kinda is, but it isn't at the "It's the best!" status. I never expected it to get more downloads than Godmode. There are still some regular mods that have more downloads than this...
i installed it properly but it crashes ;-;
I think having a file from any dlc will crash it. you may have to delete saves. I dont know for sure though so try to find another solution first and if nothing works back up saves for later before deleting
Can this be played with Afterbirth+ -.-
It's a Rebirth only mod, so no
ооооооооооооооооооо
I only found this by seeing the trailer on leathers channel (the animator for the trailer)
January 20, 2017 - 5 months ago

A new animated Planetarium theme (from Antibirth) is now available!

There is a new DLC search filter on the Browse Mods page.

Added the 50 new babies from Afterbirth+.

The What's New sheet will try to get your attention when there is a new site update.

Fixed some mod icons not changing after being updated.