For convenient operation, you may shoot a video using your smartphone or camera in portrait orientation with one hand. But when you open the video on your PC or stream to TV, it possibly plays horizontally and you have to view it with a wry neck. In fact, the device itself may exist a rotation mechanism which will convert vertical video to horizontal automatically. 

So what's the solution for vertical video fix and how to turn a video? You may turn to video rotator free download. However, less video rotate software on the market can recognize and remove the hidden rotation setting. It's advisable to choose well-known free video rotator software like Freemake, AVC, etc to invert video. It's an easy job to remove the rotation setting and convert & turn video 90 degrees.