Tools needed: snapseed.

1. Download, install and open snapseed in the APP store.

Second, import the photos that need to be cut in snapseed.

Third, select "Tools" in the navigation bar, and then select "Crop".

4. Select the required picture proportion in the menu bar and drag it with your finger to cut it.

5. Click on the lower right corner to confirm the return to the previous level.

6. Select Save As in the navigation bar.