Coltorti was born in
Kriens. During his career in his country, he played with
SC Kriens,
FC Schaffhausen,
FC Thun and
Grasshopper Club Zürich, being first choice for the latter three sides. On 30 August 2007, Coltorti penned a four-year contract with Spanish club
Racing de Santander, for
€1 million. During
his first season with the
Cantabrians he was mainly restricted to
Copa del Rey matches, which also happened in
the following; his
La Liga debut came on 22 December 2007, in a 1–4 away loss against
Sevilla FC. From mid-December 2009 to February 2010, Coltorti had his longest league run in Racing's goal, benefitting from starter
Toño's injury. In the first eight matches the team only lost once, at
Villarreal CF (2–0), conceding just seven goals. He would finish
the campaign with 23 league appearances, as they barely avoided relegation after finishing in 16th position. Toño returned to full fitness for
2010–11, playing 37 of 38 league games. In mid-June 2011, Coltorti returned to his country and signed a one-year deal with
FC Lausanne-Sport. During a league game against
BSC Young Boys in early April of the following year he injured his
little finger in the final minutes but, rather than leaving the pitch as his team had already used all three
substitutes, he relocated his finger back into place and continued playing until the end of the 3–1 away win. In the summer of 2012, Coltorti joined German club
RB Leipzig, helping it promote from the
Regionalliga Nord to the
2. Bundesliga in just two years. In late July 2014 he suffered a serious knee injury, going on to be sidelined for several months. On 24 April of the following year he became the first goalkeeper to score a winner from open play in any of the
two major levels of German football, netting in the
90th minute for a 2–1 home victory over
SV Darmstadt 98. Coltorti's maiden and only appearance in the
Bundesliga took place on 1 April 2017, as the 36-year-old was in goal during the 4–0 home win against Darmstadt. He announced his retirement in August 2018, with a
testimonial match due to be held in his honour the following year. ==International career==