There are several image resizing tools online.
Image Resizer is one option.
Go to https://ImageResizer.com/
1. Upload your image by clicking Select Image or drag your image from your folder.
2. Your original image will appear here with the current dimensions.
3. Enter your new dimensions under 1200 px (pixels) on the long side. You can also enter a target file size under 300 KB (optional).
4. Click the Resize Image button.
5. Review your new file sizes.
6. Download your image.
