If you need to share PDF files online, compressing them is a must. Smaller PDFs are quicker to upload and download, easier to email, and take up less storage space. Luckily, plenty of free web-based ...
Use Preview: Open the PDF in Preview, click File > Export, select “Reduce File Size” under Quartz Filter, and save. Use ColorSync Utility: Open the PDF in ColorSync Utility, click File > Export, ...