I have been trying to use Helvetica font while creating the pdf but the font is not reflected back in pdf.
I did some google and found some solutions but none are wo
expanding baxangs answer for linux (x64) users: you install the ttf font file in /usr/share/fonts/font-folder/font-name
and then in your css file use the fontname which is listed in fc-list, you don't need to use @font-face, just use the fontname in your css
example Verdana.ttf======
copy from local machine to server into /usr/share/fonts/Verdana/Verdana.ttf
fc-list to get the fontname (most likely it'll be Verdana)
Then use in your css P{ font-family: 'Verdana'}
and that's it! took me a while to get it fixed.