The pop superstar appeared on the New Heights podcast hosted by her boyfriend, National Football League player Travis Kelce, and his brother, Jason Kelce.
Showgirl will be released on October 3, the singer said on the episode aired on Wednesday.
"This album is about what was going on behind the scenes in my inner life during this tour, which was so exuberant and electric and vibrant," Swift said.
"It just comes from like the most infectiously joyful, wild, dramatic place I was in my life."
The 35-year-old American said that "effervescence" came through and promised some "bangers."
Swift has won 14 Grammys including an unparalleled four album of the year honours. Showgirl will be her 12th original album.
The Eras Tour, which featured music from throughout her two-decade career, concluded in December 2024 and grossed more than $US2 billion ($NZ3.3 billion).
The singer said she jetted to Sweden between European tour dates to record the album.
She said her goal was to produce "melodies that were so infectious that you're almost angry at it" and lyrics that were "as vivid, crisp, focused and completely intentional.”
The cover for the 12-track album features Swift floating underwater in a bejewelled bodice. She said the image represented the end of her night on tour.
The title track is a collaboration with Sabrina Carpenter. Other songs include Elizabeth Taylor, Eldest Daughter and Actually Romantic.
Travis Kelce said the Showgirl album "will make you dance" and was a contrast to Swift's last release, The Tortured Poets Department.
"Oh yeah," said Swift, who agreed that her music often reflected her feelings at the time.
"Life is more upbeat."
