The playmaker from Guadalajara scored 39 goals in 82 matches over all competitions for the Galaxy from 2020 to 2023 but suffered a torn right knee ligament last June in a US Open Cup quarter-final to end his campaign early.
"Life becomes exciting when you allow yourself to change and evolve to new challenges," Hernandez posted on Instagram. "Thanks to everyone who was involved in my journey these 4 years. Thank you for everything @lagalaxy."
Hernandez was a two-time MLS All-Star and led the Galaxy in scoring in 2021 and 2022, netting 18 goals last year and 17 in 2021.
"We are grateful to Javier for his dedication and contributions to the LA Galaxy," said Galaxy coach and sporting director Greg Vanney.
"In four seasons with the Galaxy, Javier was a passionate leader for our club on and off the field. We wish him all the best moving forward."
Hernandez played six Premier League campaigns for Manchester United, scoring 37 goals in 103 matches.
He spent much of the 2014-15 season on loan to Real Madrid, scoring seven goals in 23 LaLiga matches, and was with German side Bayer Leverkusen for the next two seasons, scoring 28 goals in 54 matches.
Hernandez returned to the Premier League with West Ham United, netting 16 goals in 55 matches, and had a brief stay at Sevilla before joining the Galaxy in 2020.
