Fairy Forms or Transformations are different levels of power that fairies can attain as an extention of their magical abilities.
Fairies' abilities are limited in their civilian forms. To increase their magical abilities, they transform into fairies and are able to use their powers with greater ease, gain wings, and new clothes and accessories. There are standard fairy levels, which are gained during a fairy's formal education journey to become a full-fledged fairy, and an infinite number of higher fairy levels and acquired powers meant for specific situations.
- The PopPixie form is similar to Fairy Forms.
- The Winx were seen in most of their Fairy Forms on Earth:
- Winx: When the Winx went to Mitzi's Halloween party.
- Enchantix: When the Winx were searching for Roxy and fighting the Wizards of the Black Circle.
- Believix: When the Winx made humans believe in magic and fought against the Wizards of the Black Circle, the Trix, and Tritannus.
- Sophix: When the Winx were battling Diana in Amazonia.
- Lovix: When the Winx were battling Aurora in the North.
- Harmonix: When Bloom, Musa, and Tecna fought against the mutants and the Trix.
- Sirenix: When the Winx were battling Tritannus.
- Bloomix: When the Winx went to Gardenia, Egypt, China, Calavera, and Fearwood.
- Butterflix: When the Winx went to Italy, the Sumatran Jungle, the Qinling Mountains, and Ethiopia.
- Charmix, Mythix, Tynix, and Cosmix are the only Fairy Forms to be not seen on Earth.
- Harmonix is the only known temporary Fairy Form.
- Tecna wears pants or shorts in most of her Fairy Forms.
- Charmix, Sophix, and Lovix are the only Fairy Forms to have not been seen in flash animation.
- It is also the only Fairy Forms to not make an appearance in the comics.
- Sophix, and Lovix are the only Fairy Forms to not have the words "Magic Winx!" as part of the transformation phrase.
- In Season 8, it is revealed the Winx can return to their Enchantix and Sirenix forms at will, with no explanation how.