PDF Optimizer — or — File—Save as Choose “Adobe PDF Files, Optimized" from the Type menu. Click the Settings button. Set the PDF Compatibility. Click OK.
To make backward and forward compatibility easier, Spire.Pdf allows you to convert existing PDF documents to another PDF version. Full application support for all the PDF versions may not be possible. To provide support for some older applications, Spire.Pdf allows you to create PDF documents in different versions- PDF
To provide support for older applications, PDFOne .NET allows you to create PDF documents in several versions - PDF 1.4 (Adobe Acrobat 5.x) , PDF 1.5 (Adobe Acrobat 6.x), and PDF 1.6 (Adobe Acrobat 7.x).
2 Dec 2009 Hi,. I have a pdf file that i need to upgrade to 5 or higher. I downloaded doPDF 6 but I am unable to open and save teh old pdf file. How can i upgrade this older pdf file to the newer one. I do not have a copy of the original word doc that this was created from. Any advise would be greatly appreciated. Thanks.
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5 Jul 2012
On the dialog box disable all optimizations in the list on the left side, then select the PDF level by setting "Make compatible with" to the version of Acrobat your PDF version is compatible with. enter image description here. When producing new PDF's you can check the conversion settings, change it and even create a custom
31 Mar 2015 If you have an older version of Adobe Acrobat, you may be having trouble opening newer PDF documents. That is because the newer formats aren't always consistent with older Adobe programs. You can re-convert a PDF file so it is compatible with an older program version as far back as Acrobat 3.0 using
Acrobat 9 Pro can be used to re-distill PDF 1.7 into any "lower" version of PDF. Look at the Distiller settings Up to you to decide if it's "not too expensive". Depending on the exact feature subset of PDF-1.7 used in your files, even (Free) Ghostscript may be able to do a good quality transformation to PDF-1.2,

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February 2018