PDF compression works by optimizing three main components: images, fonts, and document structure. Images typically account for 80-95% of total file size.
Our compression engine offers three quality presets. The screen quality preset targets 72 DPI and achieves the smallest file sizes. The print quality preset maintains 150 DPI.
Font subsetting removes unused glyphs from embedded fonts. A typical document uses only 40-80 characters from each font, so subsetting can reduce font data by 90% or more.
Structural optimization removes redundant objects, linearizes the file for faster web viewing, and compresses content streams using modern deflate algorithms.