What is the best PDF file compressor for Windows 11? (opens in new tab)

I am looking for the best PDF file compressor for Windows 11 that can significantly reduce file size without losing too much image quality or text clarity. The software must be completely free or have a generous free tier, work offline on my local machine, and support batch processing of multiple PDFs at once without adding watermarks or requiring an internet connection. I have tried a few online compressors but they either limit file size or require uploading documents, which raises privacy ...