"Was a pleasure to wear the jersey. All the best everybody."
The Hungarian midfielder joined the Hornets on a two-year loan from Italian club Parma last summer but has announced that he will no longer call Vicarage Road his home.
Tozser posted the following on Instagram: "Just wanna say a huge thanks to all of my teammates and staff members that helped me at Watford FC because I'm leaving the club!
30-year old Tozser, who had a loan stint at Watford in the second half of the 2013/14 season, made a total of 66 appearances for the Hertfordshire club.