Three weeks ago I had an empty folder. Today useeverykit.com has 14 kits and around 79 small tools, and the one rule behind all of them is that your files never leave your browser. This is the honest build log: what I made, how the client-side privacy actually works, and what it was like to have AI agents write most of it under strict test gates. Why I built it Every "free PDF merger" or "passport photo maker" uploads your file to someone's server. For a passport scan or a ...