A deal to bring Mexico's record goalscorer to London Stadium was hammered out several days ago.
Hernandez has penned a three-year contract and will fly out to Germany in the coming days to join up with West Ham coach Slaven Bilic and his new team-mates.
"I am very happy to join West Ham United. For me, the Premier League is the best league in the world and when the opportunity came, I was desperate to sign for this club," said Hernandez, who will sport the name Chicharito on his jersey.
"He has a proven goalscoring record in the Premier League, La Liga and the Bundesliga, as well in the UEFA Champions League and at international level with Mexico," club joint-chairman David Sullivan said.
Hernandez, now 29, spent four seasons with United, where he scored 59 goals in 156 appearances, before going on loan to Real Madrid in the 2014/15 campaign.
The two-time Premier League winner left Old Trafford in August 2015 for Germany, where he was even more prolific, netting 39 times in 76 matches for Bayer Leverkusen.
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