Aiseesoft 4K Converter for Mac is the best 4k converter to convert 4K videos to/from 1080p/720p HD and SD videos. It can upscale a HD or SD video to 4K video or downscale 4K videos to HD/SD videos effectively and efficiently. What is more, this video converter is also capable of editing 4K videos as they wish. Users can crop, clip videos, turn 2D to 3D, adjust videos’ brightness, contrast, saturation and hue, and add watermark to videos.