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will come in handy is the most popular phrase on the web.
"Will come in handy" indicates something in the future that is likely or certain and will be useful. "Would come in handy" indicates something that will be useful in a conditional circumstance.
285,000 results on the web
Will come in handy. [for something] to be useful. I think that this gadget will come in handy in the kitchen. See also: come. McGraw-Hill Dictionary of American Idioms ...
Perhaps this pocketknife will come in handy someday. (CK); [S] · [T] Always keep a bucket of water handy, in case of fire. (CK); [S] · [T] Having a few extra spoons and forks will come in handy for a party.
This will come in handy [useful] when you are running short of pocket money. ...
you are doing virtual email hosting, the following information will come in handy.
I don't think that will come in handy after all.
Do you think this microwave will come in handy since we don't have a stove?
113,000 results on the web
Maybe his experience would come in handy on their wedding night.
I can think of some situations in which a knife would come in handy.
This object would come in handy if we had it lying around.
I never thought this rubber band would come in handy when I put it in my drawer.
I can think of some situations in which a knife would come in handy.
I never thought this rope would come in handy when I put it in my pocket.
A screen like this would come in handy in many situations.
You know what? This thing would definitely come in handy in a circumstance like this.