Modo, meganne's correct, so I'll just give you hugs and a flower sweetie.
modo, you have your answer - so I will just give you a *
Yes any good imaging software will do this, just select "SAVE AS" then go through the list of formats in the save textbox, look in the line underneath the filename, where it should have wording something like, "Save As Type" hope this helps. hugs n roses, Meganne
PS: of course you have to first open the .jpeg, you wish to change, from within your imaging software. :-}