After uploading, Acrobat will automatically reduce the PDF size Go to Adobe offers a free online PDF-compression tool that's great for reducing PDF file sizesClick the Select a file button. This opens your computer's file browser. Organize The main reason people compress PDF files (or any files for that matter) is to reduce the size and make it easier to send them via email or other online channels. Done! Compress a PDF. Select a PDF to reduce its file size fast. [1] Alternatively, you can drag