Related software: HD Video Converter Factory Pro
A: When you load 2 or more videos, you can find the "Compression" button next to the "Run" button at the bottom. Click the "Compression" button and a slider will appear. Then you can move the slider to compress videos in batches.
You can also adjust video and audio parameters to reduce the file size. You will find 6 effective methods to compress large video files in this post: The Best Video Size Compressor: 6 Effective Methods to Compress Large Video Files