I had a similar issue with my own thesis. The way I dealt with it issue was to use features of the PDF format. PDF allows a file to specify several different boxes: TrimBox, MediaBox, ArtBox, CropBox, BleedBox. Relevant to this situation is MediaBox: the size of the paper you are printing on (in your case A4); and TrimBox: the size of the page after trimming. Many PDF viewers (Adobe Reader for example) are able to display these boxes optionally. I don't know of any packages that make use of this feature (would make a nice modification to geometry or crop), so I did it by hand: \pdfpageattr{/TrimBox[9 9 621 801]} where if I recall correctly the units are in pts. You can see a result here, where I wanted the final page to be US Letter size, but to have a 0.125" bleed before trimming. If you are using Adobe Reader, then to show the boxes use Edit -> Preferences -> Page Display -> Show art, trim, & bleed boxes.
synctexso far. You might ask this as a follow-up question. – Martin Scharrer Apr 11 '11 at 16:30centeras it appears above, which I would like:\usepackage[a4,frame]{crop}This way I can make the border to appear as a single line at the bottom. Is it possible to place just a single line below for cutting (instead of a complete square border) ? – nilon Mar 03 '17 at 19:27cropif it support such a thing. All I could do is doing the exact same thing. – Martin Scharrer Mar 15 '17 at 21:34