I have a question about that, for my personal accounts I have created a simple php file that I store locally where I can input one password that I know. Then it gets hashed with a salt + salt based on the website that I use this password at.

This hash of 24 chars is my password for that account. I don't trust any of the online password managers. Is this actually safe or not?

Note: this is not used for any of my professional work