How do I get my online w2 form early?

What makes you think you have one? If your employer makes your W2s available online, they do so at THEIR option. So you need to contact YOUR company to determine if they are available and when.

W2 are not done by the government, but provided by the place or places you have worked. So ask the human resourse department where you work if they will furnish one online, and when it wll be available.