Large PDFs are hard to email and slow to load. Compressing a PDF reduces file size, often by downsampling images and tightening the internal stream. Done well, text stays sharp and images stay readable.
Quality vs size is a trade-off: “high” or “medium” compression keeps documents looking good for most uses. “Maximum” can make scanned pages or photos look worse. Try a level that fits your needs.
Use our Compress PDF tool to reduce file size. Choose a quality level, upload, and download the result—free, with no signup.