Fix wkhtmltopdf headers clipping content?
I have learned that this is actually a known issue and is unlikely to be changed in a while. The workaround is to use style="margin:0; padding:0;" in the header <body> element. Another workaround would be to experiment with the --header-spacing n parameter. Yet another way is to wrap all top-page elements and add margin there, but that is a very bad an non-dynamic idea.
For for further information see:
http://code.google.com/p/wkhtmltopdf/issues/detail?id=182 (duplicate of this issue) http://code.google.com/p/wkhtmltopdf/issues/detail?id=175 (the origins of this issue) http://code.google.com/p/wkhtmltopdf/issues/detail?id=523 (header-spacing workaround)
Make sure you have <!doctype html> at the start of your header/footer page. Webkit renders the page in quirksmode otherwise.
Worked for me with <body style='height:50px;overflow:hidden;margin:0;padding:0;'> in the header and footer and the --header-spacing 30 -T 45mm parameters.