Best solutions for fixing corrupted files safely?

Hi everyone,
I’m trying to find a reliable method for dealing with corrupted files without risking further damage. I’Ve seen several online tools mentioned, including https://filescorrupter.com/, but it’s hard to tell which ones are actually trustworthy.

¿What do you usually recommend when files become unreadable—do you use recovery software or professional services? Any advice or personal experience would really help me choose the right approach.