Please Help!

Winx Version 2  Vorgeschlagen von GermanSirenix 

Do you have an original image? (with background and unresized)

No. Sorry.

Where is this from?

Those are from the DS games. I think it's a custom font by Rainbow, but they never used it since.

Sadly I think you might be right. It bears such a resemblance to the logo.
Either the logo itself was made from this font, or they built a font around the logo's characters (more likely). Regardless, the closest anybody seems to have found was http://myfonts.us/td-a4kIiv

Yeah, and let's not forget about the Magic Winx Font made by kustren von DeviantArt.

Yes, also true. His was released in 2014, but is still a good replica.