One always should be able to take the most of any functionality of any program using the command line (that’s why I am reluctant to build only graphical interfaces without command line interface). Now PDF MetaEdit should work properly and you should be able to drag&drop any pdf file to the window and change its metadata. Sudo ln -s /usr/local/bin/pdftk /opt/local/bin/pdftk I suggest to create a soft link to that path from the terminal: PDF MetaEdit is ready to work with a MacPorts distribution and it looks for pdftk executable in the path “/opt/local/bin/pdftk”, and I could not find a way to change that path (it seems to be miserably hard-coded). I don’t know any other similar program for Linux, sorry. If you use Mac you are lucky, because there is also an independent free project called PDF MetaEdit (I don’t know German either, but the “download” button is very helpful )), which is just a helpful front-end for pdftk (In case you prefer a direct link…). In the blog fredericiana you can find a dmg installer containing a precompiled distribution of pdftk with all libraries needed.

If you know and like MacPorts, you should try there first, although I had some troubles with a dependency and didn’t work.Windows users may follow the instructions in the pdftk page to download the executable. There are also debian packages in the pdftk website. Linux users can install it using any package manager such as apt-get. The open source project pdftk is a command line tool for general PDF edition: rotate, merge, split, edit metadata… There is the good way to do that: using pdftk. However I do not recommend doing that because if you change the file size and you don’t update that explicit value at the very endof the file, it would be corrupted (it’s not a catastrophic corruption and you’d still be able to open the file, but it’s a corruption anyway). You could simply change those lines as desired and you’d be done. By the end of the file you might see some lines like these if the file has metadata embedded: In fact you can open a PDF file with a plain text editor (such as TextMate or vi) and you will understand some things, although everything may seem quite messy at first sight. PDF files are part binary, part plain text. In this post you will see Introduction to PDF metadata It is very common that programs that let you save or export in PDF format does not allow to customize metadata, and sometimes you want to add this kind of information for many reasons. Metadata is a piece of information that is not part of the main content of the data, such as image and PDF files, but that is attached to it giving you some useful information such as the author, program used to create it, date of creation/modification, GPS location in case of photographs, and any other interesting info.

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