- My go-to is Document 365 by Kdan Mobile due to the sheer amount of tools available, including PDF compression. Although this function is available on Macs only, unfortunately. With the PDF Reader app that's designed for smaller devices (tablets, phones) and comes with Document 365, I'm able to get a lot done when I'm away from my desktop, and that's exactly what I want out of a PDF editing app - portability and efficiency. So, I'm able to compress PDFs on my desktop, but all the other editing tools are available to me on my phone/tablet, such as annotation, form filler, watermarks, split and merge, night mode and file converter and that's plenty for a small device.I use this software exclusively when I'm dealing with PDF compression - it works quite well on my MacBook, and I beleive this feature is available on other platforms as well.
- I sometimes upload PDFs to Google Drive and convert them to a Google Doc. If you do need them in PDF format, you can re-download them as PDFs and Google Drive will generate an optimized version, likely much lighter than the original PDF you uploaded.
- As a graphic designer I opted-in for Adobe Creative Suite and part of it is Adobe Acrobat Pro DC. I really like to make my own PDF files but I find it very useful to handle large PDF files since I can optimize/compress them whenever I need. You could give it a try and see if paying $14.99/mo is worth for you (or maybe you'll like to pay $49.99/mo for the whole suite).