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The Binding of Isaac: Antibirth
An unofficial, fan-made expansion.
Created 1 year 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.

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hey for people complaining about the darn Download. when you install Antibirth. Unzip it outside of the Rebirth Folder. i placed mine on the desktop.
I love the mod , but I'm kinda sad because it's not on Afterbirth/Afterbirth+
OK. I've tried everything. EVERYTHING to make this motherfucker work properly, and nothing anybody says is working. I've uninstalled Afterbirth, and I don't have Afterbirth+. I've tried unzipping it directly, and indirectly, but nothing is working. It used to just crash on a black screen. But ever since I unzipped it into the Rebirth folder itself, I keep getting this message: "The code execution cannot proceed because steam_api.dll was not found. Reinstalling the program may fix this problem." This message seems to be a bunch of bullshit, since I've reinstalled dozens of times, and nothing has happened. So, I don't know. Anyone willing to help? This is really starting to piss me off.
Best mod I've seen so far. Good job to creators.
I can not use the mod after installing it inside the folder (including with the automatic installer). Does anyone know how to help?
i have a question why isn't anti birth just called abortion?
It says the download website is unsafe.
Stanley? Can you hear me? I seem to have been trapped in a game about crying on your mother... Wait where you are, i will fix this in a moment! love the Stanley Parable sounding narrator for the beginning scene
@NightMarineMaybe you failed with install? (sry for my English )
why it doesen't work with rebirth when I launch I'm waiting 2 seconds and the game crashed wtf.
November 2, 2017 - 4 months ago

We now have a store with modding-related and Antibirth shirts, with designs by the amazing Elko! The price may be going up a little soon, so if you wanted to get them at the lowest price they will be, now is the time. Special thanks to DragonoidSlayer for helping get this set up!

Store Page