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Seven ways to reduce a PDF's size for email

From downsampling images to removing embedded fonts, the practical steps that get a PDF under a 10 MB attachment limit.

SK
Sara KimContent
6 min read
Desk with notebook, coffee and laptop

Most size problems come from images. A scanned page stored at 600 dpi is far larger than it needs to be.

  • Downsample images to 150 dpi.
  • Convert colour scans to greyscale.
  • Remove unused metadata and thumbnails.
  • Flatten form fields once they are filled.

Frequently asked questions

How do I make a PDF under 10 MB?

Downsample images to 150 dpi, convert colour scans to greyscale and remove unused metadata.

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Everything in this guide runs in your browser. Free, with nothing uploaded.

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