To Fill In or To Fill Out?

When dealing with forms, is “to fill in” more grammatically correct than “to fill out” or vice versa?

This isn’t exactly a big deal, but it’s something that plays on my mind when I’m wording any text I display above a form.

What do you normally use (if any)?

2 thoughts on “To Fill In or To Fill Out?”

  1. I go with fill out because that is the more common wording, in my experience, so it sounds natural to me. But, fill in makes sense and works, as well. Flip a coin. :)

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