I am going to have to throw my two cents worth in here as we have a lot of people who know a little bit and and making assumptions. There more to it than simply saving as PDF and there a serious gotcha that can seriously bite you on the bum. First thing to consider is that if you have any layers or vector objects leave your Layers intact. Export out using the High Quality Print preset in the PDF dialog. This will give you a fully scalable file (as far as the print and vector objects are concerned. Go try it and open the resulting PDF and zoom in as far as it will let you go. The gotcha is the option to save layers. You don need this for PDF but if you uncheck it and later save the PSD file it is possible to overwrite your layered PSD file with a flattened version. I _think_ this was fixed a few versions ago but it has happened to me a few years ago and we still see people post to the Adobe forum that it has happened to them. There is no fix I am afraid. In fact we see a post about a corrupt PSD file once a month or so. I know at least some of them are caused by crashes or run out of battery power part way through the final save. If you are overwriting an earlier save you lose everything! So the Adobe forum regulars save big projects with incremental file names on an hoy basis. That way if your last save crashes you still have the earlier file.