Optimization
Understanding PDF Compression & Optimization
Technical breakdown of Flate stream compression, JPEG DCT downsampling, JBIG2 monochrome encoding, and font subsetting.
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What Makes PDF Files Heavy?
PDF files are container formats. The primary culprits behind large PDF sizes are: 1) Uncompressed or high-DPI raster images, 2) Full embedded font sets rather than subsets, 3) Redundant metadata streams, and 4) Unreferenced ghost objects created during multiple edits.
Image Downsampling & Re-encoding
A 600 DPI photo scanned for printing contains 16 times more pixels than needed for screen reading. Downsampling to 150 DPI with balanced JPEG quality preserves crisp typography while reducing file size by 70% to 90%.
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