I've stumbled upon "Sign up free" and "Sign up for free" on different websites.
"Sign up free" makes no sense to me. Is it correct? Which one should I use on my website? Thanks.
I've stumbled upon "Sign up free" and "Sign up for free" on different websites.
"Sign up free" makes no sense to me. Is it correct? Which one should I use on my website? Thanks.
If it's a clickable link or a label:
If it's in the narrative, though, don't write "sign up free" because it's ungrammatical; instead write "for free."
Both are fine.
In "Sign up free." "Sign up" is a phrasal verb, "free" is an adverb modifying it, and the whole thing is a perfectly grammatical imperative sentence.
"Sign up for free." is identical except that it uses the phrase "for free", which has been handled in another question: Is the phrase "for free" correct?