"Merlin's beard! No need to disfigure me, Albus."
Horace Slughorn to Albus Dumbledore[src]

Untransfiguration was a branch of transfiguration magic and a type of counter-spell, which involved returning something to its proper form, reversing the effects of a transfiguration.

Untransfiguration was covered in beginner-level spellbooks such as A Beginner's Guide to Transfiguration. Learning untransfiguration was mandatory at Hogwarts School of Witchcraft and Wizardry from 1926 onward.[1] Failure to at least attempt to untranfigure a wrongly-done transfiguration was considered irresponsible.


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Professor McGonagall untransfiguring Draco Malfoy in 1994

Reparifarge seems to be a general Untransfigurative spell used to counter the effects of a Transformation spell that was poorly performed and only partially transfigured the object in question.[2] The spell is located in A Beginner's Guide to Transfiguration by Emeric Switch.

Vipera Evanesca is also a Untransfiguration spell. The incantation for the spell that causes a target Snake to vanish in a puff of black smoke. As such, it can be used as a counter-spell for spells that produce serpents, such as Serpensortia or the Fire to snake spell, annihilating the conjured or transfigured snake. 

Revelio could be used to untransfigure a human transfiguration.

Known instances of Untransfiguraton

In Harry Potter's first Transfiguration class, in 1991, when Professor Minerva McGonagall Transfigured her desk into a pig, and the pig back to a desk.

Also in 1993 when Remus Lupin and Sirius Black changed Peter Pettigrew from a rat back into his usual human appearance.

In 1994 when the new Defence Against the Dark Arts professor Barty Crouch Jr (disguised as Alastor Moody) transfigured Draco Malfoy into a ferret Minerva McGonagall transfigured him back.

Known practitioners

Behind the scenes

According to W.O.M.B.A.T., it may not be possible to Untransfigure a person or object without knowing what they were originally. However, in Harry Potter and the Goblet of Fire, when Draco Malfoy is turned into a ferret, Professor McGonagall Untransfigures him while only knowing that it was a student, not who it was specifically. This implies that either one does not need to know very specific details about what the object was before Transfiguration or that she guessed it was Malfoy due to his absence from his usual gang.


Notes and references

Transfiguration (class)
Professors: Albus Dumbledore · Minerva McGonagall
Textbooks: A Beginner's Guide to Transfiguration · Intermediate Transfiguration · A Guide to Advanced Transfiguration
Known practitioners: Emeric Switch · Circe · Falco Aesalon · Mirabella Plunkett · Thaddeus Thurkell ·
Transfiguration spells studied at Hogwarts: Chair to cat · Match to needle · Snail to Teapot · Teacup to Rat · Switching Spell · Transforming Spell · Avifors Spell · Mice to Snuffboxes · Beetle Buttons · Rabbit Slippers · Vera Verto · Teapot to tortoise · Draconifors Spell · Lapifors Spell · Vanishing Spell · Owl to opera glasses · Guinea fowl to guinea pig · Hedgehog to pincushion · Small Child to Rat · Meddling Man to Monkey · Crinus Muto
Branches of Transfiguration: Transformation · Vanishment · Conjuration · Untransfiguration