Hi, luatex doesn't deal with negative protrusion values correctly -- for opentype fonts, the margin kern is too small, while for type1 fonts it's way off, and even in the wrong direction: \tracingoutput1 \showboxbreadth\maxdimen \showboxdepth\maxdimen % Opentype: \input{luaotfload.sty} \font\x="Latin Modern Roman" at 12pt % Type1: % \font\x=cmr12 \x \pdfprotrudechars2 \parindent=0pt \lpcode\x`N=-500 \rpcode\x`N=-500 \lpcode\x`Z= 500 \rpcode\x`Z= 500 H\hfill H\penalty-10000 N\hfill N\par H\hfill H\penalty-10000 Z\hfill Z\par \bye Regards, -- Robert