The Acrobat online PDF compressor balances an optimised file size against the expected quality of images, fonts and other file content. Just drag and drop a PDF into the tool above and let Acrobat reduce the file size without compromising quality.
For more refined control of optimisation settings, you can try Adobe Acrobat Pro DC for free for seven days. Acrobat Pro DC for Mac or Windows lets you customise PPI settings for colour, grayscale and monochrome image quality. You can also edit PDF files, edit scans with OCR, convert PDFs, convert PNGs and other image file formats, organise and rotate PDF pages, split PDFs and more with an Acrobat Pro subscription.