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The Binding of Isaac: Antibirth
An unofficial, fan-made expansion.
Created 8 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.


x 2096
Someone have a seed to unlock A Secret Exit? I need so much, but is so hard to do
This is an amazing mod in looks and play, if this becomes a real dlc, I'll be a happy man
By far, the best mod this game has, new characters, challenges, rooms, items, enemies, bosses... Hell, even a new soundtrack! Fucking amazing, can't wait to see it grow!
its like getting the best toppings on a pizza
we need a vid to explain for new people
could anyone tell me exactly how to download it? I think I might have done it wrong
When I saw this on youtube I thought it was a real dlc but now I know its actually an amazing mod
Antibirth Won't load I am going into my files selecting the antibirth folder Isaac-ng and it won't load it just crashes
Any suggestions on how to to get it to work?
Remember that Antibirth will not work with Afterbirth/Afterbirth+.
The mod was made before that, and actually inspired some of the items in Afterbirth.
this mod is awful it gave my laptop a virus and doesn't even launch it just crashes
you did something wrong lol and nope this didnt give your laptop a virus
barely played this and already awsome
how do you uninstall this? its causing crashes
click on the download, the page loads for a minute and error
January 20, 2017 - 7 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.