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PDF tool · in your browser

Compress a PDF on iPhone

Shrink a large scan or photo-heavy PDF from Safari before you email or upload it. The file is re-encoded on your iPhone, and if compression cannot make it smaller, the original is returned instead.

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Drag & drop PDF file here

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How it works

  1. 1Select the PDF you want to shrink.
  2. 2Click Compress — each page is re-encoded at a smaller size.
  3. 3The smaller PDF downloads instantly.

When this helps

  • Reduce an attachment that exceeds a mail or form-upload size limit.
  • Shrink a scan created with the Notes or Files app before sharing it.
  • Save storage when an image-heavy PDF is much larger than it needs to be.

Tips for a clean result

  • Compression helps scans and photo-heavy PDFs most; text-only documents may already be compact.
  • Keep Safari open during processing because large PDFs need more time and device memory.

Frequently asked questions

How much smaller will it be?+

It depends on the content; scanned and photo-heavy PDFs shrink the most. If we can't beat the original, you get the original back.

Will the text stay selectable?+

Compression re-encodes pages as images, so text becomes part of the image. Use it when small size matters most.

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