|Date of birth||11 January 1996|
|Place of birth||Delft, Netherlands|
|Height||1.73 m (5 ft 8 in)|
|Playing position||Right back|
|* Senior club appearances and goals counted for the domestic league only and correct as of 6 July 2019|
Born in Delft, Gronsveld started his youth career with the academy of local Vitesse Delft. In April 2014, he joined the academy of Feyenoord. In June 2015, he was promoted to the senior team and was issued the 25 number jersey. He made his debut in a pre-season friendly game against Heerenveen, but was suffered a hamstring injury in the first half and was ruled out of play for almost the entire season. He managed to recover in the following April.
After having played no competitive match for Feyenoord, Gronsveld joined FC Emmen on a two-year deal on 10 June 2016. However, in the following month, it was announced that he had undergone a hip surgery and was ruled out of play for four months. On 13 January 2018, he made his first team debut against FC Eindhoven. On 9 May 2018, his contract was extended for another year.
- As of match played on 17 May 2018
|FC Emmen||2016–17||Eerste Divisie||0||0||0||0||—||0||0|
- "S. Grosveld". Soccerway. Retrieved 10 April 2018.
- "Feyenoord legt talent Stef Gronsveld uit Delft vast [Feyenoord captures talent Stef Gronsveld from Delft]" (in Dutch). Haaglanden. 26 April 2014. Retrieved 10 April 2018.
- "Jeugdspeler Stef Gronsveld (19) uit Delft stroomt door naar hoofdselectie Feyenoord [Youth player Stef Gronsveld (19) from Delft continues to head selection Feyenoord]" (in Dutch). Omproepwest. 24 June 2015. Retrieved 10 April 2018.
- "Stef Gronsveld op de weg terug bij FC Emmen [Stef Gronsveld on the way back at FC Emmen]" (in Dutch). RTV Drenthe. 8 September 2017. Retrieved 10 April 2018.
- "Feyenoorder Gronsveld verkast naar FC Emmen [Feyenoorder Gronsveld moved to FC Emmen]" (in Dutch). VI. 10 June 2016. Retrieved 10 April 2018.
- "FC Emmen aanwinst Stef Gronsveld lang uit de roulatie [FC Emmen acquisition Stef Gronsveld long out of the rotation]" (in Dutch). RTV. 5 August 2016. Retrieved 10 April 2018.
- "Eindhoven 2 - 1 Emmen". Soccerway. Retrieved 10 April 2018.
- "Stef Gronsveld verlengt contract bij FC Emmen" [Stef Gronsveld extends contract with FC Emmen] (in Dutch). RTV Drenthe. 9 May 2018. Retrieved 12 July 2018.