The Binding of Isaac Wiki
Advertisement

Razor Blade is an unlockable activated item.

A silver, sharp razor blade.

Effects

Allows trading hearts for more damage in the current room upon each activation.

Isaac pays a full heart in normal state but half a heart while recovering from damage (Isaac blinking). Basic Damage is increased by 1.2. Final Damage increment on each use decreases with the number of repeated usages because of the square root "soft cap" in the damage formula.

Pays Soul Hearts if Isaac has less than one full Red Heart. Otherwise, it takes Eternal Hearts first, then Red Hearts.

Notes

  • Using the Razor Blade will count as damage for 'No-Damage-Runs'.
  • According to Edmund in this video, using the Razor four times results in double damage for that room.
  • DLC2.png The Last-Will Symbol of Razor Blade will be blank if you killed yourself with it.

Synergies

  • Items that grant temporary invulnerability like Celtic Cross or The Polaroid allows unlimited usage of Razor Blade for free while invulnerable, granting a huge damage boost. Very helpful when fighting late game bosses.

Gallery

Trivia

  • After using this item, Isaac looks like a Dople.
  • The item itself is a reference to the act of cutting one's self, usually at the wrists, to inflict self-harm or to commit suicide by loss of blood.

Bugs

  • In The Womb and all levels onwards:
    • Heart price doubles
    • Moreover, if Isaac has just enough Red Hearts for the trading and some spare Soul Hearts, it doesn't utilize those Soul Hearts but uses up all the Red Hearts, thus killing Isaac. A remedy is to always keep a half damaged Red Heart container.
  • See also: Scapular's Bugs section
Items
Passive Items
The Sad OnionThe Inner EyeSpoon BenderMax's HeadMy ReflectionNumber OneBlood of the MartyrBrother BobbySkatoleCube of Meat


Halo Of Flies1UPMagic MushroomThe VirusRoid RageLess Than ThreeRaw LiverSkeleton KeyA DollarA Quarter


Boom!TranscendenceThe CompassLunchDinnerDessertBreakfastRotten MeatWooden SpoonPHD


The BeltMom's UnderwearMom's HeelsMom's LipstickWire Coat HangerRosaryXRay VisionLucky FootCupid's ArrowSteven


PentagramDr. FetusMagnetoTreasure MapMom's EyeDistant AdmirationWiggle WormThe LadderCharm Of The VampireThe Mark


The BatterySteam SaleSister MaggyTechnologyChocolate MilkGrowth HormonesMini MushroomThe PactDead CatLord Of The Pit


Loki's HornsLittle ChubbySpider's BiteSmall RockSpelunker HatSuper BandageSack Of PenniesRobo-BabyLittle C.H.A.D.The Relic


Little GishLittle SteveThe HaloThe Common ColdThe ParasiteMr. MegaThe WaferMoney Equals PowerMom's ContactsGuardian Angel


Demon BabyMom's KnifeOuija Board9 VoltDead BirdBrimstoneBlood BagOdd Mushroom (Thin)Odd Mushroom (Large)Whore Of Babylon


Bobby-BombForever AloneBucket Of LardBomb BagA Lump of Coal


Wrath of the Lamb DLC.png


Guppy's TailStigmataMom's PurseBob's CursePageant BoyScapularSpeed BallBum FriendInfestationIPECAC


Tough LoveThe MulliganTechnology 2Mutant SpiderChemical PeelThe PeeperHabitBloody LustSpirit Of The NightAnkh


Celtic CrossGhost BabyCat-O-Nine-TailsHarlequin BabyEpic FetusPolyphemusDaddy LonglegsSacrificial DaggerMitreRainbow Baby


Stem CellsHoly WaterFateThe Black BeanSacred HeartTooth PicksHoly GrailDead DoveGuppy's Hair BallAbel


SMB Super Fan!Pyro3 Dollar BillMEAT!Magic 8 BallMom's Coin PurseSqueezyJesus JuiceBox
Activated Items
The BibleThe Book of BelialThe NecronomiconThe PoopMr. BoomTammy's HeadMom's BraKamikazeMom's PadBob's Rotten Head


Teleport!My Little UnicornYum HeartDoctor's RemoteShoop Da Whoop!Book Of RevelationsLemon MishapBook of ShadowsAnarchist CookbookThe Hourglass


The NailWe Need To Go Deeper!Deck of CardsMonstro's ToothThe GamekidThe Book Of SinMom's Bottle of PillsThe DiceThe Pinking ShearsThe Bean


Monster ManuelDead Sea ScrollsRazor BladeForget Me NowA Pony


Wrath of the Lamb DLC.png


Guppy's PawIV BagBest FriendRemote DetonatorGuppy's HeadPrayer CardNotched AxeCrystal BallCrack The SkyThe Candle


D20Spider ButtDad's KeyPortable SlotWhite PonyBlood RightsTelepathy for Dummies
Advertisement