Over the years, I've used my fair share of these little online tools — converting currencies, turning files or images from one format into another. And always with the same hope: free, no spam, no ads, no subscription wall. Do you know the feeling? I bet you do. We've all been there at least once. So I decided to build my own. With my teammate Claude, I generated a set of HTML apps that work flawlessly and do exactly what they promise — for free, with no spam and no subscript

Most file converters ask you to hand your data to a stranger's server. For anyone working with client figures, personnel lists, or anything covered by a confidentiality clause, that is a non-starter. So I built one that doesn't. The Excelized Converter is a single HTML file that runs entirely in your browser. You open it, drop in a file, and it reads, cleans, and exports — with no upload, no account, and no backend. The file you drop in never leaves your device. You can also