# How It Works

> The technology behind the tools: in-browser processing, WebAssembly, file formats and compression, explained so you know why results look the way they do.

- URL: https://qilingtools.com/en/blog/category/explainers

- [Why Your Files Never Get Uploaded - How In-Browser Processing Works](https://qilingtools.com/en/blog/files-stay-in-your-browser) (2026-10-29): QiLing Tools' PDF, image, audio and video tools run inside your browser, so files never touch a server. Here is how that works, how to verify it yourself, and its limits.