it can get pretty annoying to type your password every single time you want to log in to your Chromebook, particularly if you are using a touch-screen type device. Fortunately, there’s a tweak that allows you to use a PIN instead of a password, making the unlocking process much faster.
This new feature is only available in Chrome’s Flags menu, as it’s still currently still in “experimental” stages. The good news is that it appears to be mostly bug-free. And even if it does mess up, it just defaults to password entry, so you’re not completely locked out of your Chromebook.
For details on how to set it up, refer to the article How to Unlock Your Chromebook with a PIN