I tried many PDF compression tools and found’A-PDF Image Downsample’ to be the best one. It is a brilliant utility that reduces the file size by resampling high resolution images in a PDF file even while maintaining the image quality.
Very easy to install and a simple user interface. Searched a lot on the internet but couldn’t find a similar one. Check out https://a-pdf.com/downsample/index.htm
Extremely useful when you need to send PDF files as email attachments or upload them to web sites that have limits on the file size.
The best part is that it is reasonably priced and you can buy it online through their website.