ToolkitBook
ToolkitBook is a free collection of browser-based tools, built and maintained by one developer. No accounts, no subscriptions, no data uploads. Open a tool, use it, move on.
I kept hitting the same wall: I'd need a quick tool—format some JSON, generate a password, convert units—and I'd end up Googling for one. Every time, I'd dig through results, close pop-ups, dismiss cookie banners, and finally land on something that sort of worked. A waste of time, every single time.
So I started building what I kept reaching for. One turned into two, two turned into a handful, and here we are. ToolkitBook is the result—one place with the tools I actually use, without the noise.
Every tool on this site runs in your browser. Plain JavaScript—sometimes a third-party library when it makes sense—but nothing ever goes to a server. Your data stays on your machine. That's not a feature; it's just how it should work.
I add new tools whenever I run into a gap in my own workflow or something strikes me as worth building. No roadmap, no release schedule—just steady additions over time. If something here saves you a few minutes, it's done its job.