It is the band's ninth most streamed song, fifth best selling single in combined sales category and seventh best selling single in paid-for sales category in the United Kingdom as of January 2019.

The single has sold over 600,000 copies to date in the UK and the US and also achieved gold status there. The song was performed live on Miss Teen USA 2000. To date, 'Swear It Again' is Westlife's only single to have charted in the US, peaking at number 20 on the Billboard Hot 100 and ranking number 75 on the Billboard Hot 100 year-end charts, in 2000. This made it the first of fourteen UK number-one singles. It moved to 182,000 units in the first two weeks of its release, and spent 13 weeks on the charts. It peaked at number one in the UK Singles Chart for two weeks in May 1999.

This is the best-selling debut single of all-time from an Irish citizen. It was released on 19 April 1999 in the United Kingdom, and on 25 February 2000 in the United States as the first and only single from their self-titled debut album Westlife (1999). 'Swear It Again' (Alternate title: 'Swear It All Over Again') is a song by Irish boy band Westlife.

Lyrics lagu westlife swear it again