Frames per sec issue

My first animation and made the whole thing previewing the animation at 25 frames per sec, (the default setting). For my video, I want 30 fps but simply changing the fps right now speeds up the animation. I still want it to be the same length. Is there any option to simply change it from 25fps to 30fps without speeding up the animation?

Without rerendering it, I’m afraid not. (at least, afaik.)

add your animation as an action strip in the NLA. press N to bring up the properties. Where action end is, say, 250, change Strip end to 300. That will stretch out the action from 250 frames to 300 frames, and then render it at 30 fps.