All you have to do is choose a video from your Gallery/Files and the app will export it in such a way that you can send the full video on WhatsApp Messenger. All of that while making sure to compress the video just enough so the output quality is the best possible.

The exported video is automatically saved to your Gallery when processing is done. You also have the option to share it directly from the app.

If you need to send a long video on WhatsApp "Longer Videos for WhatsApp" is the best available option!