High definition is a very high quality format of your video. If you uploaded HD video, your video will playback in HD. If you uploaded SD video (~640x480), then it will playback in standard definition.
We specifically encode your videos in the following formats, assuming you uploaded the largest resolution we support:
240p, 360p, 480p, 720p, 1080p, 2K, 4K and 8K.
We cannot upgrade or improve the quality of your video files. The higher quality you upload, the better quality your viewers will enjoy.
Please refer to our help article on Video Compression Guidelines to help ensure an optimal viewing experience for your audience.