# Blog - Online Tool Tips & Tutorials

> The QiLing Tools blog: practical tips and tutorials for PDF, image, audio and video tasks, how each free online tool works, and why your files never need to be uploaded.

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

RSS: https://qilingtools.com/en/blog/feed.xml

## Categories

- [Tutorials](https://qilingtools.com/en/blog/category/tutorials): Step-by-step guides to solving real tasks with free online tools: PDF compression and conversion, image editing, audio and video, and how to pick the right method.
- [How It Works](https://qilingtools.com/en/blog/category/explainers): The technology behind the tools: in-browser processing, WebAssembly, file formats and compression, explained so you know why results look the way they do.
- [Tips & Stories](https://qilingtools.com/en/blog/category/sharing): Readers share how they use online tools for PDFs, images, audio, video and everyday files: practical experience and handy tricks.
- [Changelog](https://qilingtools.com/en/blog/changelog)

## All posts

- [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.
- [PDF Too Large? Identify the File Type, Then Pick a Method](https://qilingtools.com/en/blog/pdf-too-large) (2026-10-29): Large PDFs get large for different reasons. Scans shrink best as compressed images, text PDFs need lossless optimization to keep selectable text, and the rest can be split by size.