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The 21-year-old has signed a two-year deal at Selhurst Park after being released by Sky Bet Championship club Blackpool at the end of last season.
Kettings, who was born in Glasgow, spent time with Manchester City before joining Blackpool in 2007, signing a professional deal after the Seasiders were relegated from the Premier League in 2011.
He has been out on loan with Birmingham City, Morecambe and York City and now hopes to make an impact with Palace's development side.
Kettings said: "I'm delighted because this is a massive club. Everyone who I've spoken to about Crystal Palace has only had good things to say so I think it's a massive opportunity for myself and a good club to come to.
"I'm really looking forward to working with both Julian Speroni and Wayne Hennessey as they'll both be able to teach me things and give me new perspectives so it'll be good for me to work with them.
"I had a really good relationship working with George Wood when he was at Blackpool as he was inspirational and helped me progress when I was 18 years old. I developed a lot under him and hopefully I can develop even more here."
Kettings' agent, Chris Greenhill of LPM Football Agents told Sky Sports: "There were a lot of clubs interested in speaking to Chris, however, when we had spoken to Palace it was an easy decision from there."
his is brilliant! All these years of moral ambiguity, grey areas of offence and context..now we have a simple, easy to follow guide to right and wrong. What did you do today? I kicked the face off a panda . Oh well, you didn't rape, kill anyone or abuse a minor, knock yourself champ.