Videomaker – Learn video production and editing, camera reviews › Forums › Technique › Editing › How to speed up videos?
Telling us what software you're using is always a good idea as each one uses different methods.
I'm pretty sure you need a software package of some kind. Unless there is some web page that specializes in doing that, but I doubt it.
I use Vegas Pro to do this.
Vegas Pro does this quite well, but what are you using?
Search Videomaker.com, they have some great articles on editing software 😀
Using ShowBiz to speed up videos: