PDF Compression Guide: Shrink Files Without Losing Quality

How PDF compression works, the difference between lossy and lossless, and how to reduce PDF size safely.

PDF compression reduces a file's size so it is easier to email, upload and store — ideally without a visible drop in quality.

What makes a PDF large?

High-resolution images are usually the culprit, followed by embedded fonts and, in scanned documents, full-page images. Compression targets these areas.

Lossy vs lossless compression

• Lossless compression removes redundancy with no quality change, but offers smaller savings
• Lossy compression reduces image detail for much smaller files — ideal for sharing

How to compress without ruining quality

Choose a compression level that matches your goal: light compression for printing, stronger compression for email and the web. Our PDFForge compresses scanned and image-heavy PDFs directly in your browser.