I built 7 browser-only dev tools because I got tired of ads and data collection

Every few months I end up on some random website trying to decode a JWT or hash a string, and it's the same experience every time. Cookie banners, ads covering half the page, and that nagging feeling that my data just got sent to someone's server. So I built my own versions. Seven of them, actually. The problem with most online dev tools Most of these tools are simple operations. Base64 encoding is a one-liner in any language. Hashing a string takes three lines of JavaScript with the Web Crypto API. But when you're debugging at midnight and just need a quick answer, you reach for a browser tool. And almost every one of them sends your input to a server. I checked. Paste a JWT into most "JWT decoders" online and watch your network tab. That token, which might contain user IDs, emails, permissions, is getting shipped off somewhere. For a decode operation that requires zero server involvement. What I built All of these run entirely in your browser. No backend calls, no data leaving your m