Most of the video editing tools are desktop apps, sometime you need to edit video but you are in outside. Loopster is an online video editing tool. For using this service you must sign up in loopster. You can also sign up via your existing facebook account.
After the sign up you can edit your videos here you can add text, trim and add sound track. It cannot give professional editing. After edit your video you can publish it. You can download your videos as MPEG format.