PDF
•
Jan 25, 2026
•
4 min de lecture
How to Compress PDFs Without Losing Quality
Most PDF bloat comes from over-sampled embedded images. Smart compression resamples those without touching the text layer.
A PDF's file size is mostly its embedded images and embedded fonts. Text and vector graphics are tiny. To compress without visible quality loss: downsample images from 300+ DPI to 150 DPI (still print-OK), convert color images to JPEG2000 instead of PNG where reasonable, and subset embedded fonts to just the glyphs used. A 50 MB PDF often shrinks to 5 MB with no perceptible quality loss. Our PDF Compressor uses these techniques. For email attachments, target 5 MB; for web download, 2 MB.