1. To realize the video editing function, we need to download a "video format factory" on the mobile phone, which is the so-called format factory;

2. After installation, we will see its home page when we open it, and click "Add" on the far left;

3. After clicking Add, we click "Video" on the next page, so that the system will automatically display all local video files of the mobile phone;

4. Click the video to be cut directly, click the video to be cut, and then you can preview the video. Select Convert at the bottom of the preview window and click;

5. We find and click "Convert", and then turn on the switch behind crop at the bottom of the page;

5. Turn on this switch to pop up a screenshot icon above the video, and drag the border to change the screenshot size;

6. After selecting the cropping size, click "Convert Now" in the lower right corner of the new page, and the original video will be cropped and automatically saved to the mobile phone after the cropping is completed.