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The Binding of Isaac: Antibirth
An unofficial, fan-made expansion.
Created 7 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 antibirth.com are completely safe to use - you should be able to download this mod without any issues.

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downloads
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what is the destination folder?
i can't see myself and enemies in the downpour who can help?
do other mods work together with this mod?
what folder do I put it in I tried resources, but it isn't working.
please help me out with this i really wanna try this mod

When you don't have enough money for repentance
ahuevo es mejor que el real muchas grasias manito
the antibirth always made me wanna get this mod along with the binding of isaac
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
Repentace has A LOT more content
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
Antibirth crashes anytime I try to launch it, I put it in the Rebirth folder and launch it from there, what do I do?
Ok for anyone reading, someone said "You need to copy every files in Steam/Steamapps/The Binding Of Isaac/ressources/packed , and paste them in [...]/The Binding Of Isaac/Antibirth/ressources/packed
If you don't understand just watch a tutorial.
I hope it helped you ", hopefully he helped you.
This actually worked! Thank you so much!
no its not, you'll downloading it from the oficial website
I dOn'T tRuSt mEdIafIrE", "iT's An eXe, sO iT's vIrUs", BRO, JUST STFU AND DOWNLOAD THE MOD
I think people need to stop thinking with the stomach. This mod is getting an official DLC, so why the hell would the creator do something like putting a virus in the thing? That doesn't make any sense at all.
Is Afterbirth + needed as I only have Afterbirth and this mod looks great!
does it work with afterbirth or just rebirth?
my antibirth just crashes whenever i click to run it, help me!
You need to copy every files in Steam/Steamapps/The Binding Of Isaac/ressources/packed , and paste them in [...]/The Binding Of Isaac/Antibirth/ressources/packed
If you don't understand just watch a tutorial.
I hope it helped you
coud you make a antibirth + pjs
Noice, i always wanted to play with som' guys
when i downloaded this it would no let me play rebirth
Este mod sinceramente me encanto!con una banda sonora increíble y con unos personajes,monstruos,jefes,objetos y secretos bien pulidos y muy interesantes.
For those claiming to get viruses - you're not actually getting viruses. For some reason, Antibirth seems to trigger a number of antiviruses. All of the links from antibirth.com are completely safe, though.
It's cool how this is going to be official! I'm so excited for Repentance
Can we use it for Afterbirth ? even if not, the mod looks nice. Keep working hard
repentance will let us play it with ab+
is there a mod that makes this dlc easier? cuz goddamn the game is so much fun-er now its just harder and i dont like disadvantages :
It just keeps crashing for me... Can anyone help?
did you make sure to install it correctly? if not, there's some guides online that can walk you through the process
i cant play it it crahse the whole time my game i need help
This. Is... The Best Mod Better Than GOD MODE.
Awesome Mod for one of my favorite Unofficial DLCS. I'm ready for the new mod!
Is There Download for afterbirth DLC?
I installed antibirth, double-clicked the icon, and it loaded up a window which then immediately closed. Any help please?
I cant wait for repentance to make this mod official
Что делать, если клавиатура как будто залипает со странным (похоже системным) звуком? Такая проблема только в Antibirth. Я пользуюсь Windows 10
how to download mods on top of this mod?
Awesome, the soundtrack, the enemies, the bosses, everything is perfect!
Can't wait for Repentance
i heard people are getting viruses from installing this is it true i want to install this mod
t540998 i never got a virus installing this so you should be fine
no, this mod doesn't give out viruses
really good mod , the new contennt is great!!!
uuh i was going to download it, but everyone says its giving them viruses
Is there any way to install additional mods on top of antibirth?
I like viruses!A.K.A The Antibirth link's download.
At the time of installing, what would be the right folders to select?
If it's a .a file then do resource/packed
Why did I get THREE VIRUSES from trying to get this mod?
why are you fucking lying to people in a desperate attempt to scare them and ruin the mod creator's image?
They're not lying. The download is bad, which probably isn't the creator's fault, but it gave me two viruses.
is this available for Afterbirth?
Help! I try to open the binding of isaac antibirth and when i do it game crashing
maybe u have afterbirth or afterbirth+
How do unlock the characters and stuff?
Bethany is unlocked by having 12 soul hearts at once
Jacob+Esau are unlocked by killing the final boss *no spoilers here.
I can't seem to download Could someone please teach me how, and yes before you complain, I've checked and tried Reddit and youtube and the Antibirth page itself
I have a question I want to create a mod but I don't want to replace something how do you do this please show me Im really intrested in making a mod
Help! I try to open issac and it just closes as soon as it opens ;-;
when I download it and put it in the correct folder, then open the game, it's the normal unmodded game
make this mod support Mac download pls
when i download the game and play, the name appears "The binding of isaac afterbirth +" and close
what am i doing wrong?
how i can get the new floors ???
You need to beat the game once
Then you'll access the extra floors via the doors on the boss rooms
gud mod and myxa letaysha9 na sayte ochen' top
It says that I can not use it on MacOS because it is not supported by Windows or something and so for that reason I can not use it.
I´m trying but i can´t install this mod correctly
I but it with the .exe in the rebirth resource file
amazing mod but wish they would update it for AB+
Awesome rebirth mod for two players
An Incredible Expansion! I love it!
The antibirth dowload doesn't start
It says I have afterbirth installed when I do not have afterbirth installed. please help. All I want to do is install this-
man i installed it properly and such but when I open it it stays black for like 15 secs and then it says it hasstopped working and reporting ht e problem to microsoft what do I do???
Yeah Happened to me too found a fix?

same there is a black screen and than crashes..
it doesn't work, it starts the unmodded rebirth
omg ppl think it's a goddamn virus because it's an exe xD
THERE IS NO AB+ VERSION STOP ASKING
its .exe lel can anyone tell me where the real one is?
not all .exe files are viruses the binding of isaac is a .exe and .ng file
It's an exe file because antibirth adds new content to the original game. Unlike in AB+, non-exe mods can only edit existing items and characters. Thus, antibirth uses an exe file to install the extra content
antibirth IS an exe you dumb f**k
can you make the mod for afterbirth and afterbirth+?
please, get an icon please... *kicks with leg*

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Rebirth only works with this, not AB or AB+.
so i tried to make it work on afterbirth + and it didn't work
That's because it's a rebirth mod- c
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?
so its not a Virus? because im not bolt enough to install the .exe file x)
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
57798Maybe 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.
does this work with afterbirth plus ???
i can promise you this is not a virus
I tried to install antibirth, but it doesnt seem to work for me.
does it work because my riberth doesn't work with it
Amazing mod, 10/10. Am going to get sometime.
i need some help: i've done the instructions but whenever i go to play it says it is not responding
Solved it - don't install it into the BOI folder, but into a separate location - that did the trick for me.
You know, you guy's should put this on the steam workshop so people could play it easier. I mean, it's nod bad to download it, but it's nice to subscribe to it on the workshop, and play the mod from there. The mod is great, though. I played it on my old PC and adored it.
I feel the workshop is only for AB+, This mod (currently) does not support AB+. This situation may change in the future though.
This is actually the best thing ever.
This mod is sick, cant wait for the update
When will it be out for afterbirth?
i can't find "the pile" is just him to i finally unlock the new stages and i don't have necropolis someone help me
It's Crashes every time. Can someone help?
Probably a conflict with some other mods you have installed.
Why i don't have this special entrance to new "stages"
and you unlock with killing the new bosses
i have a question
i beat all new bosses baby plum,reap creep and the pile then i quit the run and started new one.
but the thing is that i dont understand how to unlock new floors
kill all new bosses in 1 run or something cuz i really dont understand
i think u need to use the new character the girl
first kill all the new bosses then either kill your self or finish the run one of those 2 ways any other dont work
The best mod i have ever seen. Tottaly love it.
TO EVERYONE READING THIS!! afterbirth.com/.net/.whateveritis, theres an update on that page letting everyone know whats going on. please examine it carefully
아니 이거 어떻게적용해요?
Honestly my favorite Isaac mod. So much effort put in to it. I give my gratitude to all the people that made this mod.

i cant get it to work it says it isnt reasponding :'(
THIS IS FREAKING FANTASTIC This is done with SO much effort, and it payed off so good! You should have been a team in the actual development, as this could easily slip in as a DLC more expensive than even Afterbirth+
Is this compatible with afterbirth or do I have to deactivate the dlc beforehand?
seeds dont unlock achievements in tboir/tboia
Issac.ng crashes when I launch it. I put it in where the "help" area said to, "C:/Program Files (x86)/Steam/SteamApps/common/The Binding of Isaac Rebirth/resources/". Does not want to run. Normal rebirth still works. Any tips?
Make sure Afterbirth is completely deactivated before installing Antibirth. It should work then
My game keeps crashing whenever I start the game, can someone help please?
Make sure Afterbirth is completely deactivated before installing Antibirth. It should work then
Dear moderator, STOP FINING ME AND REMOVING MY COMMENTS!!! i was asking for help you jerk! now sure, delete this, just dont do this to anyone else, because its dumb and its really angering me. thank you, AND DONT REMOVE THIS!!! keep in mind that i had to download the game myself (which took an hour) instead of getting help from you. sorry for being salty, your mod is great, just keep my complaints in mind.
April 10, 2022 - 2 years ago
Hey! We have a new Discord server. You can find more information in the announcements channel there. See you there!