How do a reduce a pdf file size while keeping the quality?

Download PDF Toolkit from the App Store.

Is this the same as customising a PDF setting with image compressions lower.

i.e - make a out put at 75pdi for all images?

I'm curious as I have lots of hires images on a 32 page document, (55mb) and the only way I can think if reducing the pdf file size undr 15mb is to trick indesign by removing the images folder while making the PDF so it believes there are no images and uses a screen version.

It's free, why don't you try it?

In the Utilities folder, there is the ColorSync Utility.

It has a Filters option.

Filters has a Reduce File Size component.

Reduce File Size has adjustments for image sampling, and compression.

The default setting will reduce a PDF by ~50%.

The caveat is that you may need to tweak the adjustments for optimum viewing. Allow for someone increasing the magnification of the final PDF to 150% for vision preference.

It is always preferable to reduce graphics content size in primary tools like PS or GIMP, before resorting to external tools as above.

VikingOSX wrote:

In the Utilities folder, there is the ColorSync Utility.

It has a Filters option.

Filters has a Reduce File Size component.

Reduce File Size has adjustments for image sampling, and compression.

The default setting will reduce a PDF by ~50%.

The caveat is that you may need to tweak the adjustments for optimum viewing. Allow for someone increasing the magnification of the final PDF to 150% for variations in eyesight.

It is always preferable to reduce graphics content size in primary tools like PS or GIMP, before resorting to external tools as above.

And why would that be, they are also external tools. You have tried this or are you guessing?

I don't post recommendations unless I have actually used it.

I have used ColorSync Utility personally and the default settings reduced a PDF from 3.8MB to 1.6MB.

If I believe that a standard operating system utility will perform the task required by the OP, then I will recommend it. If it doesn't meet the parameters, than I will recommend a third-party solution.

HI, i tried it using coloursync... but no luck. I used the coloursync 'Reduce size' but it made a few mb difference only.

I have used colorsync, can't get 3 to 1 reductions in filesize without quality loss in my experience, so the OP should try for himself.

OK, so is the PDF toolkit really that good at reducing a hires 14mb pdf into a small email friendly one?

Stick to 72dpi and 5 to 1 is an acheivable file size reduction.

Hi, is that a setting on PDF TOOLKIT or in colour snyc save thing!

I tried exporting the document at 72dpi in pdf settings but didnt work, so think maybe testing the PDFtoolkit may be only option. Do you agree

🙂

PDF Toolkit (I made the same suggestion in this post, it fixed the OP's issue, and you posted in the same post and hopefully saw the results)

Cheers, i just bought the PDF toolkit and am trying the 72dpi option first. Its taking ages to read the 20mb pdf original, so fongers crossed it works on professional mgazines and designs.

Be very interesting to see the result.