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rdsk · 08-20-2023, 01:59 AM

Many thanks. I have now unpacked the pdf from the azw4 format.
The file is very large and I'd like to compress it. However, when I try the reduce file size in acrobat 10 pro, I get message that: "This PDF document has been digitally signed. The size of digitally signed files cannot be reduced."

I tried Google Bard, which suggested saving in PDFA/1a format but this actually increased the file size from 55MB to 56MB.
1. Is it possible to remove the digital signature eg via copying to another format or printing to a new pdf file?
2. Are there anyways to substantially reduce the file size please?

08-20-2023, 01:59 AM	#3
rdsk Member Posts: 11 Karma: 10 Join Date: Oct 2016 Device: Kindle 3 (3GB)	Many thanks. I have now unpacked the pdf from the azw4 format. The file is very large and I'd like to compress it. However, when I try the reduce file size in acrobat 10 pro, I get message that: "This PDF document has been digitally signed. The size of digitally signed files cannot be reduced." I tried Google Bard, which suggested saving in PDFA/1a format but this actually increased the file size from 55MB to 56MB. 1. Is it possible to remove the digital signature eg via copying to another format or printing to a new pdf file? 2. Are there anyways to substantially reduce the file size please?