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Asked: May 11, 20262026-05-11T14:52:09+00:00 2026-05-11T14:52:09+00:00

I need to store custom meta-data in a Word document. The ‘document properties’ are

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I need to store custom meta-data in a Word document. The ‘document properties’ are limited to 255 bytes but I have data which is >> 10k

We are using VBA to write a word extension to interact with our application and want to have our application data stored in the word document. The idea is that that the user can share just the word document without sharing any other data files of our application.

Has anyone ideas how to store arbitrary meta-data efficently in Office 2003+ documents?

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  1. 2026-05-11T14:52:10+00:00Added an answer on May 11, 2026 at 2:52 pm

    Just tried this in the VBA editor immediate window:

    ActiveDocument.Variables.Add 'foo', String(10000, '.')  ? Len(ActiveDocument.Variables('foo')) 10000 

    Document variables are stored with the document. They seem to go up to 65280 Unicode characters, as I just found out (tested in Word 2003; Update: This limit is the same in Word 2007 and 2010).

    If you fear to get near the 60k for your data, I’d recommend either splitting it over several variables, or compressing it before you store it. This post shows some options to do that in VBA.

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