Why More Web Tools Are Moving Processing to the Browser (And How to Build One)

A few years ago, almost every "online tool" worked the same way: you upload your file to a server, wait for a response, then download the result. Simple, but it has real costs — server bandwidth, storage, latency, and (the big one) your file leaves your device. Lately more tools are shifting that entire pipeline into the browser itself. No upload, no server round-trip, no storage. Here's why that shift is happening, and what it actually takes to build a tool this way. Privacy by default. If a fi