If your goal is to convert existing videos into "beautiful" (high-quality/4K) MP4 files, these tools are currently leading the market:
: Use YouCam Video for the best "beauty" filters on MP4 recordings. Beautiful 2mp4
If you are looking for an app to make videos "beautiful" before exporting them as MP4 files, these are the top contenders: If your goal is to convert existing videos
: A popular choice on Android for its "one-tap" beauty functions, including body reshaping, teeth whitening, and high-quality MP4 video recording. including body reshaping
: Recommended for users who need a balance of simplicity and advanced features. It includes a high-quality engine for 4K conversion and basic editing tools like watermarking and cropping.