tl;dr: Two brothers reflect on 20 years of running Zamzar, a bootstrapped file-conversion SaaS launched in 2006, which has processed over 766 million files for 550+ million users and now handles 1M+ API requests daily. The UK company remains small, independent, and VC-free, supporting 2,128 conversion types and donating to 60+ charities. Along the way they've helped PowerPoint's inventor recover old files, worked with Vint Cerf on digital preservation, and received a cease-and-desist from Google over YouTube downloads.