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[liberationtech] Metadata Cleanup trough File Format Convertion?

Bruce Potter at IRF bpotter at
Sat Jul 20 12:46:00 PDT 2013

Maybe this would help --

On the Mac platform, Lemkesoft's GraphicConverter is one of the oldest and most versatile graphic media format conversion programs (AND a good photo editor) -- it currently works with 60+ formats and explicitly allows removing OR modifying METADATA in batch mode.
or write to the author, Thorsten Lemke at support at

There are a dozen or more language versions of GraphicConverter -- it's modestly priced.


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On Jul 17, 2013, at 12:28 PM, Fabio Pietrosanti (naif) <lists at> wrote:

> Hi all,
> i've been thinking about the topic of metadata cleanup of files from an implementation point of view.
> Regardless the consideration whether it's something useful or not for a Whistleblowing platform (GlobaLeaks), i've been considering whenever the "Metadata Cleanup" can't be approached by "File Format Conversion".
> If i'd like to remove metadata from various documents formats (pdf, word, ppt, excel, etc) or image file, i've been thinking that rather then "explicitly removing metadata" a possible different approach would be by doing a "file convertion" .
> If a JPEG is converted to PNG, "maybe" all metadatas are lost. (this has to be verified)
> If a DOC/DOCX is converted to a PDF, maybe all metadatas are lost.
> At GlobaLeaks we've been discussing about introducing "metadata cleanup" [1] , but also a "file sterilization" [2] with the goal to protect Receivers of a Whistleblowing site against targeted 0day attacks.
> Should we approach "metadata cleanup" by doing the "file sterilization" processing trough existing Libreoffice convertion API [3] to save engineering effort/time?
> [1] Metadata Cleanup
> [2] File Sterilization
> [3] Libreoffice Convertion API
> -- 
> Fabio Pietrosanti (naif)
> HERMES - Center for Transparency and Digital Human Rights
> - -
> --
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