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I need to reduce the size or compress a PDF file. The PDF file is actually scanned images. Is there any way by which I can compress the file?

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marked as duplicate by Ƭᴇcʜιᴇ007, Dennis, Windos, Karan, TFM Mar 13 '13 at 6:40

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Related: Is there a free way to compress a PDF? – Ƭᴇcʜιᴇ007 Mar 12 '13 at 23:34
up vote 1 down vote accepted

Here's a link to some good recommendations. Most of them require either using PrimoPDF or NitroPDF.

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You can give Free PDF Compressor a shot. It's a portable freeware.

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i tried but no changes at all. Does a full version required? Thought it is "Free PDF Compressor" it ask us to buy. :( – SyncMaster Nov 5 '10 at 19:54
The link on that page seems to belong to paid version. This link is for the free & portable one. Hope that helps. – Mehper C. Palavuzlar Nov 5 '10 at 20:48
it is not compressiong to the expected rate. A 3.5mb file after compression becomes just 3.25MB. :( – SyncMaster Nov 6 '10 at 3:56

You can use some software like: doPDF , PDF Enhancer or PDF Compress

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Decent PDF compression products will segment scanned images into components and compress each according to content. This results in much smaller scanned pages which look identical to the original.

Examples include:

  • Nuance Omnipage which uses MRC compression.
  • Solid PDF Tools which uses CGM compression (my company's product).

Typically these kinds products will break the pages into parts that make sense from a compression point of view:

  • photo-like images are downsampled (say from 300dpi to 150dpi) and then compressed with lossy compression (Jpeg or Jpeg2000)
  • black text is compressed using lossless compression (CCITT Fax for example)
  • "flat" color (like graphs, etc) is converted to palettized images.
  • etc.
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