I dono whether there is something easily available now.. but during the time phpbb 3.04 (or something) is just released, I was looking out for ways to resize image in forum posts.... I could'nt find much info... So I decided to do the modifications myself... and the below link has the post that explains how to do it http://e-infotainment.com/forums/viewtopic.php?f=21&t=283 It explains two ways... one uses custom bb code through ACP, and in the other method, you have to do the modifications yourself in the code, so that you could use [ img ] tag itself for doing the resize... Let me know if it helps