# 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.

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

- [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.