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Why Are My PDF Files So Large? 3 Common Causes

Diagnose bloated documents. Learn what causes massive file sizes and how to fix them.

By Maya OrtizAugust 25, 20261 min read

Diagnosing the bloat

If your 10-page document is somehow 85MB, one of three things went wrong during creation:

  1. Unoptimized Images: You inserted raw 4K photos instead of web-sized versions.
  2. Embedded Fonts: The creator software embedded entire font families (including bold, italic, and foreign characters) instead of subsetting just the characters used.
  3. Hidden Layers: Design files exported from Illustrator or CAD software often retain hidden editing layers.

Running the file through our Compress PDF tool will automatically resolve all three issues.

#file size#compress pdf#optimization

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