Limitations of online tools: File size restrictions, limited free usage, potential privacy concerns. Desktop applications like PDFgear provide comprehensive and unrestricted PDF compression.

Various free and paid software tools allow you to compress your PDF files while retaining their high quality. Such software includes CocoDoc, Adobe Acrobat, PDF2GO, PDF Compressor, and Preview.

The Files app on your iPhone or iPad isn't just a basic file manager. It also includes several additional features that can make storing data a breeze.

Launch the Files app on your iPhone or iPad. Find the file or folder that you want to compress. Press and hold on the file or folder, then select Compress from the contextual menu.

While Adobe Acrobat DC is the best way to compress PDF files, the compression feature is only available in the paid version of the software.