"1" was released worldwide in CD and cassette. The vinyl format was released only in the United Kingdom. The CD includes a 32-page booklet with a coloured page with international picture covers (a total of 163 covers are displayed on the whole booklet) and details (recording date, location, release date, chart stats) for each of the singles. It also includes on its first two pages a collage with 27 1s in different colours (all of them following the same art as the cover) with the sentence "27 No. 1 singles = "1"" (which was used as a catch phrase for the promo ads for the album), and a foreword by George Martin.