Why I Built Another File Converter (Probably a Stupid Idea)

There are a million file converters on the internet. And I built one anyway. The Backstory About 10 years ago I was working at a design agency in Adelaide and we used TinyPNG constantly. Drop your PNGs, get them back smaller, done. I loved the simplicity of it and always thought the same approach would work for file conversion - find the format pairing you need, drag your files in, see per-file progress in real time, get a batch ZIP at the end. A few years back I built a .NET API called ConvertX.to - 90+ converters, mostly a portfolio project. Then I let the domain lapse. Life happened. When I finally went to build the frontend I'd always wanted, the .fast gTLD had just launched. I checked convert.fast . Available. Bought it on the spot, along with about 70 other .fast domains. What I Actually Built I spent about two months building and shipping the web UI in December 2025. The architecture behind it is a shared accounts system on accounts.tools.fast - an OpenIddict SSO provider across