This free tool can help you convert GIF animated images to video. The default video generated from GIF images has only pictures and no sound. By using this tool, you can add audio files as video background music. When you choose to add audio, the tool will provide an extended option "Repeat GIF until audio ends", the GIF image will be looped until the audio ends, or, if the audio is shorter than the GIF image, the audio will be repeated until the GIF ends. If the original GIF is transparent, the tool can also create transparent video. By default, the generated video is opaque. The output format is MP4 video. Using the "Keep transparent if GIF is transparent" option, the tool will detect if the source GIF is transparent, if so, the tool will keep the transparency and create a transparent video, the output format is WEBM video, otherwise, the output format is MP4 video. The output format is MP4 video or WEBM video.