Watermark Adder offers a simple way to protect your videos by adding your signature to them . It allows to add logo to MP4 , WMV , MKV , VOB , AVI , VOB , 3GP , RMVB , FLV , and QuickTime MOV video formats . The process is straight forward , simply select the image of your computer , load the watermark image , and click on " Add " button . Watermark Adder will then add the watermark to the videos .