Converting video to HD quality on Android can be done using a third-party application. Here are the steps you can follow:
1. Download and install a reliable video converter app for Android, such as VideoProc or Wondershare Video Converter Ultimate.
2. Launch the application and select the file that you want to convert from your device's storage.
3. Select HD (High Definition) as your output format in the app settings, along with other options like resolution and frame rate that determine the quality of your final video output.
4. Finally, press 'Convert' to begin the conversion process and wait until it is finished before saving it on your device's storage or sharing it online with others.
It is important to remember that converting videos in this way may require time and resources depending on their size and length, so make sure you have enough free space available on your device before starting any conversion process. Additionally, always make sure to download reliable applications from trusted sources only, as some apps may include malicious software that could compromise your device's security or privacy settings.