The 21-year-old will continue her spell as a Red after agreeing fresh terms at the AXA Melwood Training Centre.
Kirby joined Liverpool from Everton in September 2022 and has made five appearances for the senior team thus far.
The Scouser made her debut two months after joining in a League Cup victory over Blackburn Rovers.
She also featured in three Barclays Women’s Super League matches during the 2022-23 season and was named the team’s Young Player of the Year.
An England youth international, Kirby joined Aberdeen on loan ahead of the 2023-24 campaign. However, her time there was cut short by the suffering of an anterior cruciate ligament injury.
She returned from that setback early in 2025, appearing for the U21s in a friendly before rejoining the senior matchday squad several times towards the end of last season.
Speaking to Liverpoolfc.com, Kirby said: “It feels great to get it over the line. Obviously there have been talks behind the scenes for quite a while now. So, I’m just over the moon to get it done and get going now.
“I feel like we’ve got a strong [goalkeeping] group. At the end of the day there’s only one shirt but we’re going to push each other. Whoever gets that starting position has obviously earned it, so we’re just there to support.
“We’ll push each other every day and you never know what can happen.”
