Shrink large PDF files: The difference between 'Save' and 'Save As'
If you’re finding that the size of files when using the Save feature in Nitro PDF Pro is on the large side, try using the Save As feature instead.
PDF files have something that is called incremental updates, where any changes that you make to a document is appended to the end of the file without doing a complete rewrite. This is why the Save feature is much faster than a Save As, and also why PDF files saved this way can be large. The Save As feature will rewrite the entire file and provide you with a smaller file size.
If you’re interested in learning more about incremental updates, I suggest you read section 3.4.5 in the PDF Reference available from Adobe’s website.
PDF Reference – http://www.adobe.com/devnet/pdf/pdf_reference.html


[...] functionality to trim some fat off your PDF files. Chris Dahl explained it succinctly in a recent post: PDF files have something that is called incremental updates, where any changes that you make to a [...]
February 11, 2008Thanks a lot! My PDF files are about 10 times smaller now!
May 15, 2008THANKS A LOT. I was struggling to get my PDF Files (with attachments) within 2.5 MB requirement. When I removed some attachments, the file became larger. I thought some virus, and unneccessarily spent two hours trying to run anti-virus program.
October 15, 2008NOw I am able to stick to the limit without sacrefiling content.
THANKS
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February 16, 2009