Edited PDF File Size

[Seraphim Larsen]

Many programs write changes to existing files as incremental appendages to
the files.  The incremental change is basically an instruction that says
"ignore all the pages of text that are encoded in the rest of this file".
But those pages are still buried there, and someone familiar with PDF
encoding could probably extract them.

The same thing happens in Word and many other applications.  The purpose is
that it makes saving a file much faster.

To get the program to rewrite the file and discard unused portions, you need
to do a Save As.


Seraphim



On 10/31/07, Keith Hansen <KRH at weiland-wfg.com> wrote:
>
>
> Interesting situation today... I took a very large PDF file (20MB). I
> deleted all but two pages from the PDF and saved it. Yet, even though it
> now contains only two pages, the file size is still shown as 20MB!
>
> I then opened the PDF and saved it under a different name. It is now
> only 140KB.
>
> Why did the edited PDF retain the huge file size, even though it only
> contained two pages? Why did the "Save As" bring about the file-size
> reduction?
>
> Just curious...
>
> Keith
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