"Any student found in posession [sic] of a spell-check charmed quill will be punished severely"
—Educational Decree Number One[src]

A Spell-Checking Quill is a type of quill that used to correct an individual's spelling errors.

During the 1995-1996 school year, these were banned from Hogwarts School of Witchcraft and Wizardry by Professor Dolores Umbridge, following the creation of Educational Decree Number One.

They were sold by Weasleys' Wizard Wheezes in 1996, where Ronald Weasley purchased one. However, the charm on the quills wore off after several months, resulting in even worse spelling than before.

Behind the scenes

  • It is possible that when the charm wears off it results in worse spelling than before, as Ron's homework was left with terrible misspellings: "belligerent" starting with "bum" and "augury" with "org", as well as "Dementors" as "Dugbogs", and his own name became "Roonil Wazlib".
    • Ironically, the misspelled name "Roonil Wazlib" partially saved Harry Potter from being condemned for using the cheating notes textbook when Harry used Ron's textbook to pass the inspection, as when Severus Snape checked Harry's books, the name in the book has changed enough for Harry to claim it was his nickname.