Converter is an activated item.



  • Using this item on Black Hearts will activate the Black Hearts damaging effect.
  • Dlc nr indicator.png Must use with two full Soul Hearts to work. One and a half will not work.


  • Dlc nr indicator.png Collectible Guppy's Paw icon.png Guppy's Paw: Allows Isaac to attain up to 10 Heart Containers and 1 Soul Heart.
    • Dlc r indicator.png Allows Isaac to attain up to 12 Heart containers.


  • Dlc nr indicator.png Character ??? (Character) icon.png ???: Converts two Soul/Black Hearts into one Soul Heart, resulting in a net loss.
    • Character ??? (Character) icon.png ???: Converts one Soul/Black Heart into one Soul Heart, making it only useful for getting rid of Black Hearts without lowering his health or for items that trigger when an active item is used.
      • Character ??? (Character) icon.png ??? with Dlc r indicator.png Collectible Birthright icon.png Birthright will remove one Soul Heart and grant two, effectively granting infinite health.
  • Character Bethany icon.png Bethany: No effect.
  • Dlc r indicator.png Collectible Book of Virtues icon.png Book of Virtues: Spawns wisps in the middle ring, looking like hearts. Wisps have slightly higher health than average.
  • Dlc a indicator.png Collectible Car Battery icon.png Car Battery: No effect.
  • Character The Forgotten icon.png The Forgotten: Converts Soul Hearts into Bone Hearts. Only works when controlling Character The Soul (Character) icon.png The Soul.
  • Character Tainted Bethany icon.png Tainted Bethany: Adds 1 Heart to her reserve at no cost in health, effectively giving her infinite blood charges.
  • Character Tainted Judas icon.png Tainted Judas/ Character Dark Judas icon.png Dark Judas: Converts one Black Heart into one Black Heart, effectively keeping Judas’ health the same as before but activates Collectible The Necronomicon icon.png The Necronomicon effect regardless.

In-game Footage


  • The Converter is a reference to a converter, a device or system that changes the form of something.
  • According to Edmund via the Four Souls Isaac lore stream, the Converter's sprite was originally supposed to be similar to an adapter that converted US-standard power plugs for UK-standard power outlets, then he "just threw some wires on it."
  • The Converter can be seen as an opposite to Collectible Guppy's Paw icon.png Guppy's Paw. Where the Converter takes two Soul or Black Hearts to form a Heart container (or just one Soul or Black Heart as of Repentance), Guppy's Paw takes one Heart container to form three Soul Hearts. Additionally, their flavor texts are similar.


PC NormalIndicator.png 1TNY 7MJ0 (1st floor Shop, Purchase after getting Collectible A Quarter icon.png A Quarter in 1st floor Treasure Room)
Notes: Must be Isaac because a bomb is needed to get a key. The Collectible Pandora's Box icon.png Pandora's Box in the Curse Room must be picked up before entering the Shop. The Converter is inaccessible on the Hard mode seed due to the difficulty of getting a key to open the Shop.

PC LGD3 W0PB (1st floor Shop, Purchase after getting Trinket Store Credit icon.png Store Credit as a drop HardIndicator.png )
Notes: Converter is inaccessible on the Normal mode seed due to the difficulty of getting a key to open the shop.

Switch KEBM C08G (First-floor Shop, half price) (Coins are abundant in Hard mode, obtaining in Normal mode requires bombing shopkeeper and using Sacrifice Room)

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