PDF Compression vs ZIP Compression: What Is the Difference?

Published: 2026-03-10 | Read Time: 3 min read

A direct comparison of in-place PDF stream/image compression versus generic ZIP archive packaging for email attachments and web submissions.

Frequently Asked Questions

Why doesn’t zipping a PDF shrink it very much?

PDF files already use Flate compression internally for text and embedded JPEG compression for photos. Zipping already-compressed data typically yields less than 2% size reduction.