AnyTool
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How to split a PDF by file size?

Upload your PDF to AnyTool, select the target size limit (2 MB, 5 MB, 16 MB for WhatsApp, 25 MB for Gmail), and click Split. Each output chunk stays below the size limit.

Detailed Explanation

Methodology

How Size-Based PDF Splitting Works

AnyTool splits PDFs by size using an iterative page-adding approach. Pages are added to a new PDF one at a time, checking the output size after each addition. When the target limit would be exceeded, a new chunk begins. This ensures each output file stays below the specified size limit.

  • Preset sizes: 100 KB, 200 KB, 500 KB, 1 MB, 2 MB, 5 MB, 10 MB, 25 MB
  • WhatsApp preset: 16 MB per chunk
  • Gmail preset: 25 MB per chunk
  • Output as individual PDFs or ZIP archive