Use soffice to convert from docx -> pdf deterministically.

asked 2018-07-13 13:28:06 +0100

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This post is a wiki. Anyone with karma >75 is welcome to improve it.

We use soffice to convert office files to PDFs with the following command:

    soffice --headless --convert-to pdf /path/to/input_file.docx --outdir /tmp/

Running this command consecutively with the same input file produces files that differ at the byte level. When I look at the PDF, it appears that it's happening because the internal creation date and (therefore) checksum don't match:

    <</Size 30/Root 28 0 R
    /Info 29 0 R
    /ID [ <C42F3EC6A5ECABE5AA0CE84B1584E2D7>
    <C42F3EC6A5ECABE5AA0CE84B1584E2D7> ]
    /DocChecksum /1EB116D6BE6120C6F961F99F14BCC7DD

We use a hash of the files to prevent duplication and for some caching but these differences prevent the file hash from working. Is there a way to have soffice ignore the creation date (and the rest of the author fields) or get them to be derived from the docx file instead?

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A nitpick: placing --outdir /tmp/ not immediately after --convert-to pdf will be error.

And please don't post as wiki

Mike Kaganski gravatar imageMike Kaganski ( 2018-07-13 13:33:41 +0100 )edit

Thanks Mike, actually the above works for us with that argument order (I did have a typo that my input was .pdf instead of .docx). Is there a way I can change this from being a wiki post?

mwakerman gravatar imagemwakerman ( 2018-07-14 05:30:46 +0100 )edit