I tried going to a similar algorithm of my own invention some years ago, and ran into this exact problem. Mostly sites that don't allow certain characters (whic

I tried going to a similar algorithm of my own invention some years ago, and ran into this exact problem. Mostly sites that don't allow certain characters (which is asinine). Now I have a few different algorithms that I use that are friendly to common password requirements, and I keep a list of which algorithm I used on each website, rather than just a list of the passwords. Since the algorithms only exist in my head, I think it's secure enough for most purposes.