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Reduce PDF file size : free Acrobat replacement for Leopard

348121 Views 226 Replies Latest reply: Apr 16, 2013 9:40 AM by Jerome Colas RSS
  • Dannymac22 Level 1 Level 1 (0 points)

    Thanks. I should have been more careful in what I said. I have lots of presentations, created in Powerpoint, and exported to pdf. These have lots of text, but also lots of images that take up a significant piece of a page. Many of those pdf files do not benefit, size-wise, from this Preview quartz filter strategy. Not sure what the original pixel dimensions of these images were, so yes, that might just be the reason, I guess, in that if they were already 150 dpi, and properly sized, using a 150 dpi filter wouldn't help. If they had a lower resolution, a 150 dpi filter setting might actually make the files larger, which I sometimes see happen.


    Of course, once they are in pdf, I can't tell what the resolution settings were that they had when they were placed. Can I?

  • AndyCarrott Calculating status...

    Hi Jerome

    Many thanks for your work on this! We're now recommending your reduce PDF file size filters for use with iStudio Publisher and have linked to this forum topic from our website.

    Cheers Andy

  • J90JGD Level 1 Level 1 (10 points)

    As so many other have said in this thread, a sincere thank you to Jerome. Working perfectly for me in Mountain Lion. I've been trying to figure this out for so long. Wouldn't it be great if Pages 'reduce file size' functioned like this instead of reducing images, logos, etc in so many documents to bleary mush?!

  • Hart310 Calculating status...

    Hi, I am in desperate need of the capability of converting a scanned file to a smaller PDF.  Limited on time.   I tried going to your orginal post and select the link and keep getting a HTTP error.    I am also new to using an apple computer, can you please help ASAP, in obtaining the information to convert a file.  Here is the error message I get every time I select the original post link.  "Http/1.1 Service Unavailable ".  

  • bytecom Calculating status...

    Hey Hart310,

    I found a current location for the files on p.12 of this post, and downloaded with success (thank you Jerome!! - your original post from years ago is still helping lots of people!).


    Here's the link:

  • yiannis. Level 1 Level 1 (0 points)

    Hi Jerome.


    I've been using those filters with great success until OS X 10.8

    Since then, the file gets about 4 times (!!) bigger, ie 57MB --> 223MB. I've tried everything that was mentioned, check by yourself..



  • yiannis. Level 1 Level 1 (0 points)

    Interesting. Both this file I'm trying to reduce & another one a few months ago, same thing, were *scanned* pdfs..

  • Dannymac22 Level 1 Level 1 (0 points)

    Hmmm. I tried your "JPEG compression - STANDARD.qfilter" filter, and it turned a 762K journal article pdf file (mostly text, but with a few B&W figures), into a 4.7Mb file. No joy. The built-in 150dpi STANDARD COMPRESSION filter turns it into a 913K file.


    If you run that standard filter on the output of the new filter, you end up with 1MB.


    What no one seems to have ever tried to explain is WHY these filters sometimes result in larger files. As a result, the success of any particular filter no doubt depends on what's in the file to begin with.

  • Dannymac22 Level 1 Level 1 (0 points)

    Thanks. But this file I compressed DID have some images. In fact, although this filter might have no interest in a pdf with mostly text, it was interested enough in mine to bump the size up by a factor of six. You'd think that if there were nothing compressable, it would just leave the size the same.


    If the jpeg compression is not applied when it should be, how do you turn a mostly text pdf into something a factor of 6 bigger?


    Sorry, but that WHY didn't quite fit the bill.

  • Dannymac22 Level 1 Level 1 (0 points)

    OK, well, let me understand. You posted a filter that I assumed was intended to be used with Preview to reduce a pdf file size. On the first pdf file I tried it on, it did exactly the opposite. I didn't create that file, and it was likely created with Acrobat Pro.


    Now, if you're saying that it works only in user-created pdf files. OK, so I tried it out on a document I scanned last night. Half of that document is a form with text, and the other half a gray scale picture. The original document (from VueScan) was 61K. After running it through your filter, I get 348K. Again, no joy (and again, perhaps coincidentally, a factor of six!)


    So maybe I'm just not understanding exactly what files this filter is supposed to work on?


    If the discussion was about an easy way to reduce the size of user-created pdfs, this didn't work for me.


    I appreciate the suggestion, and I'm glad it worked for you, but it's evidently not an answer for everyone.

  • BrooklynSandra Calculating status...

    Awesome! These filters still work and did the trick, can't believe I've been wrestling with this for 3 years, with a mixed of solutions/results and I never came across your solution till now. Thanks Jerome, very much appreciated.


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