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I have a web application where people can upload PDF files and I'm reviewing it online with Google Docs Viewer API, from a back-end web application. I can get many different PDF sources, because of that.

Some PDF are not correctly displayed: some text is missing. I can see the missing text when I open the PDF file with an "offline" PDF viewer, say Adobe Reader.

Any advice on this?

How to understand/debug/modify the PDF on-the-fly to make it OK?

I found an example of an incorrect PDF, the "file" command says it's a 1.4 PDF version. Google Docs shows correctly some 1.7 files I have. I first thought it could be related to a very recent PDF version, but it seems not. (I read Which versions of the PDF standard does Google Docs support? before) So what?

I can provide someone with an incorrect file if needed.

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  • any idea someone?
    – michauko
    Commented Nov 8, 2012 at 13:03
  • I guess it's not very helpful right now, but you can compare the same pdf in different versions and possibly different export settings, and by eliminating understand which versions are supported.
    – arieljannai
    Commented Jul 2, 2018 at 22:39

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