How can I sign documents digitally (using a certificate)

On the windows platform, there is a lot available to digitally sign documents (using password protected certificates that have the same value as a real signature).

What alternatives are there on the Mac platform to sign office documents, spreadsheets, pdf's etc...?

Don't tell me the preview annotate add signature feature ( = useless) ... that has nothing to do with a legal signature as the document can be modified without the signature becoming invalid.

MS office for Mac does not seem to support creating or testing the signatures created on windows.

Posted on Mar 15, 2015 1:51 PM

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5 replies

Mar 22, 2015 10:17 AM in response to sberman

Just tried the preview of office 2015 on a yosemite mac... (version 15.8.1)

There is no possibility to sign documents - and when opening a document that has a signature, then the signature can not be verified.

So Microsoft Office products are not fully multi platform (but we knew that...)


Office 2015 does not seem to catch up with any of the features that were already present 5 years ago on the windows version.

I have a whole list of items that work on windows and that are left out on the mac version: they should sell the mac version at half price !

Mar 15, 2015 2:07 PM in response to pgoedtkindt

pgoedtkindt wrote:


MS office for Mac does not seem to support creating or testing the signatures created on windows.


I wonder if you've tried the various possibilities of MS Office for Mac. I have no idea which, if any, of these might or might not support what you're trying to do.


  • MS Office for Mac 2011 (latest official version)
  • MS Office 365 (works on Mac or Windows)
  • MS Office for Mac 2016 (Beta version available now)

Mar 15, 2015 2:06 PM in response to pmiles

=> piles: wow fast reply ... 4 minutes

helpful but still a workaround only... to the ease that Microsoft Office provides on the windows platform.

This application requires to transform the word document or Excel into PDF.

I wonder if you can request multiple signatures from co-workers - I'll have to check it out.


Self-signed certificates are not really the question here - they have no legal value anyway.

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How can I sign documents digitally (using a certificate)

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