I bought a crude-looking, but effective chain breaker tool at Harbor Freight which worked well taking off a few links. It was around $15, which seemed a little high. The other alternative is to have a repair shop do it for you, which I have also done. One shop didn't even charge me on two different occasions (I had a custom-made aftermarket sprocket which ate through a few chains a few years ago, hence the multiple chains).
Online, they show two, but the handheld one I have is listed at $15, although I bought mine in store:
https://www.harborfreight.com/catalo...=chain+breaker