The former England youth international joins Remie Streete at Port Vale.
Newcastle United suffered something of a goalkeeper shortage last season.
They lost both Tim Krul and Rob Elliot to injury in quick succession, meaning they had to call upon young stopper Jak Alnwick.
The 21-year-old, who is the younger brother of Peterborough goalie Ben Alnwick, came on at half-time in the Premier League win against Chelsea in December 2014. He then went on to play eight games for the club, but started to show signs of his inexperience with mistakes against Arsenal and Tottenham.
When Krul returned to fitness in January, Alnwick was dropped completely and went on to be considered fourth choice stopper with The Toon - Krul, Elliot and Freddie Woodman ahead of him in the pecking order.
This summer his contract with The Magpies ended and he has been looking for a new club since.
Today, he found one.
Alnwick has signed a deal with League One club Port Vale, joining up with fellow former Newcastle youngster Remie Streete at the club, the 20-year-old also joining this summer.
Alnwick has only signed a short-term deal and will face a fight to be the number one keeper at Vale Park in 2015-16.