I can't find my w2 for 2023. Is there a way to quickly find it online so I can file by the deadline of April 15th?

There is no way to find your 2023 W-2.  The W-2 can only be provided to you by your employer.  Contact the employer as they are required to get you access to your W-2.

It depends on whether your employer makes your W-2 form available online.

Due to the considerable security risks, even if they do, I'm sure you have to register for a user ID and password to access it.  

Contact your employer and ask them how to get another copy of your W-2 form.