best way to do woodpecker digitally


For woodpecker method, try to play them out in your head. It's hard at first, but it forces you to think before you put the pieces on the board (on computer or real board).
Someone made a "woodpecker" study of all "easy" 221 tactics in a "interactive" mode over at another site. Here's the link to the 1st 64 (1/4): https://lichess.org/study/s2FeEYlV Easy is a relative term!

The Forward Chess Android app has the book, and a "Show/Hide Solution" button and a diagram that supports making moves/reversing the board.
For longer and more complicated puzzles, this can give your visualization skills a workout too.
I’ve seen a number of 2000+ FIDE players say that tactics puzzles are far more beneficial if you calculate the entire variation prior to moving a piece.
Not using a board in the first place is a great way of forcing yourself to do so.
This is what I’ve been doing, and it’s improved my playing strength substantially.