Before
Red release, Swift premiered a snippet of "I Knew You Were Trouble" on
Good Morning America on October 8, 2012. The following day,
Big Machine Records released the song onto the
iTunes Store for digital download. "I Knew You Were Trouble" was released to US
pop radio on November 27, 2012, by Big Machine in partnership with
Republic Records; it was the second pop radio single from
Red, following "
We Are Never Ever Getting Back Together". A limited
CD single edition of the track featuring fan-exclusive merchandise was available through Swift's official website on December 13, 2012. The song was released as a single in the UK on December 9, 2012, and in Italy on January 11, 2013. On November 3, 2014, Big Machine removed Swift's discography from the streaming platform
Spotify. The decision was made by Swift, who argued that Spotify's ad-supported free service undermined their premium service, which provides higher
royalties for songwriters. In December 2015, media outlets reported that "I Knew You Were Trouble" had been re-delivered to Spotify, but its credit was mistakenly given to the Welsh band
Lostprophets and their lead singer
Ian Watkins. The song was removed from the site after three days. Swift re-added her catalog on Spotify in June 2017. In the US, "I Knew You Were Trouble" debuted at number three on the
Billboard Hot 100 and number one on the
Digital Songs chart, with 416,000 copies sold during the first week. Together with "We Are Never Ever Getting Back Together", it made Swift the first artist in digital history to have two 400,000 digital sales opening weeks. Buoyed by strong digital sales, "I Knew You Were Trouble" reached its peak at number two on the Hot 100 chart dated January 12, 2013. The song was Swift's first number-one entry on
Adult Pop Songs, and it spent seven weeks atop
Pop Songs. The
Recording Industry Association of America (RIAA)
certified "I Knew You Were Trouble" seven times platinum in July 2018. The song's success on pop radio influenced Swift to reinvent her artistry from country to pop on her next studio album,
1989 (2014), which was
executive-produced by Swift and Martin. "I Knew You Were Trouble" was a commercial success in the English-speaking countries, peaking at number two in Canada and the UK; number three in Australia and New Zealand; and number four in Ireland. It has been
certified eleven-times platinum in Australia, five-times platinum in Canada, four-times platinum in New Zealand, and triple platinum in the UK. In continental Europe, the single peaked at number one in the Czech Republic, number three in Denmark, number five in Russia, number six in Austria, number eight in the
Commonwealth of Independent States and Switzerland, number nine in Germany, and number ten in Belgian
Flanders and Finland. The song has been certified triple platinum in Poland, double platinum in Austria, and platinum in Denmark, France, Germany, and Switzerland. ==Music video==