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Compress PDF guide

How to compress a PDF on iPhone or Android

Choose a PDF from phone storage, use a conservative compression level first, and save the smaller copy locally.

Updated September 2026 · PDFKaka EditorialOpen Compress PDF
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Compress the PDF

  1. Compare the original and compressed copies on the phone before uploading or deleting anything.
  2. Choose one PDF and start with Recommended compression.
  3. Compare the estimated or completed size with the original before choosing a stronger mode.

What stronger compression can change

Recommended mode may find no useful reduction. Strong and Maximum rasterize pages and can remove text, links, forms, accessibility data, annotations, and signature validity.

FAQ

Can stronger compression remove searchable or interactive PDF features?

Yes. Stronger modes can rasterize pages, which may remove searchable text, links, forms, accessibility information, annotations, and signature validity.

What is the current input limit for Compress PDF?

PDF; One PDF ≤50 MiB, ≤100 pages.

What does Compress PDF create?

recommended keeps structure where possible; stronger modes render pages as images and can lose text/features; One PDF ≤150 MiB.

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