How does PDF compression work?

PDF compression works by:

  • Re-encoding images more efficiently (and sometimes reducing their resolution or color depth)
  • Removing unnecessary data like metadata and unused objects
  • Embedding fonts more efficiently (often by keeping only the characters actually used)
  • Optimizing how the PDF is stored (deduplicating resources and reorganizing internal objects for efficiency)

QuillBot’s Compress PDF tool is free to use and doesn’t add watermarks to your documents.

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