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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.
I played it for about an hour. No new places at all. Only new items and that's it. Where the fug is the rest of the content.
To unlock the new levels, you must first beat all of the new bosses in the normal floors( ex; baby plum ).
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.
Go to your normal Isaac's packed file,copy what's in it and paste it in Antibirth's packed file
201084 your pc isn't good enough then
barely played this and already awsome
how do you uninstall this? its causing crashes
If it crashes,either you have AB or AB+ installed,so uninstall it,and if it still crashes,go to your normal Isaac's packed file,copy what's in it and paste it in Antibirth's packed file.
click on the download, the page loads for a minute and error
You'll have to go into your game directory and run isaac-ng.exe in the Antibirth folder.
how about taking the multiplayer from this and make it its own mod for rebirth, afterbirth and +
will this ever be compatible with afterbirth or afterbirth+?
they say it should and the devs are interested in this mod too would love to see this becoming an official dlc
very good game if u want new things
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)
What folder do you install the mod into?
when you download it, it will be in the form of a set up file (looks like a computer) then it will ask for you to chose where to send antibirth

chose your desktop, you will see the folder appear there, next go into your Binding of Isaac folder, and just drag the antibirth folder into it, not in any of the folders inside of Binding of isaacs folders, also make sure the version is rebirth.
Probably the best mod in any video game.
Hello, at first thank for this awesome mod. I like the real coop feature, so.. I would like to ask if you will try to export as a real coop mod for afterbirth + ?
hello, I would very very much like if you could port the rock bottom item into afterbirth plus. Thank you very much.
make the afterbirth+ version here, please.
This mod needs to be its own freaking game it's so AMAZING!!!!!
этот мод на реберф???
Он только для Rebirth.Но Эдмунд пообещал добавить этот мод в официальную игру летом.
Can you pls add a mac version. Because this mod looks great and sounds as well. Also my friends like it a lot.

Очееень классная DLC
Hiya 1921 ! I have finished this mod and still play it but i have a biiiiiiig question : As rumour has it AfterB+ plan on adding this mod into the game as if it was theres, is that true ? And if it is are the AntiB team going to get anything for it ?
Anyways one of the best mods out there and easily as big if not bigger than AfterB was to the game ! GG guys
this took years to make and it will most likely take even longer i'm not someone who helped make this mod but how long it took was in fact years and to redo it for AB+ will take a long time
Can you make an antibirth that supports mac? It would be nice (;3;)/
Check out there official site :
Downpour is still a problem for me, i cannot see anything that is in the water, only things that are flying (looking at you, Azazel) .-.
oh well maybe turn up your computer brighness
I'm pretty sure that wont help either, because brightness and Gamma are pretty much the same thing. Also I have looked online and it turns out it is collision issues with the water.
if you have discord you can go to the modding of isaacs discord and there is a place for antibirth support
Wrong. Just have to uninstall Afterbirth before you install Antibirth, then reinstall Afterbirth.
If you are wondering, yes the mod is compatible with Afterbirth. You just need to (if you have Afterbirth installed) uninstall Afterbirth and reinstall it after you have Antibirth installed.
sorry dude its just the name is...odd

it doesnt seem to be working correctly. if it helps i just clicked on a random folder and it said rebirth wasnt in there
you should have the hud on the left also have chance for planetarium once you unlock it
Best mod, with a lot of cool features, such as the coop and the hud :v
according to windows scanner its malware
i imagine it had to do with mediafire, that websites sketchy
Nah man, it's because you're using windows scanner
This mod is better than the official DLC
birth rights for Samson should double his bloody lust damage. and for Azazel it should ad a lot more range. because last i checked neither of them had specific things. haven't looked in a while
That sounds like too much. How about just two?
yeah. maybe. but everyone else just has such good payouts.
esse mod sucks show que voce demorou 4 anos )))))))))))))))))))))))))))))))))))))))))) tempo desperdiçado da tua vida, vai estudar seu fdp beijos de luz
kkk eae man muito interessante esse teu post mas queria te avisar que voce kibou da South America memes e o pessoal la e brabo so pra te avisar msm quem kiba de la morre beleza o pessoal la briga mesmo valeu south america memes
yes im brazilian wall me fucking trump
This mod was made as a hobby, not as a dedicated job. Also, I cannot tell if you're trolling or not, so I suggest you tone it down a bit.
The Antibirth community made a co op system
But Edmund did not? why?
Tyrone did. But Edmund said that there is only one Isaac
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!