If you are using a Mac:
- Open the image in ‘Preview’
- Click on ‘Tools’ > ‘Adjust Size’
- Ensure ‘Scale proportionally’ is checked and then either select a smaller size from the ‘Fit into dropdown’ or enter a smaller Width or Height
- Check the ‘Resulting size’ area to see if the image is now below 2.5MB
- Click ‘OK’
If you are using Windows:
- Open the image in Microsoft Paint
- Select ‘Home’ > ‘Resize’
- Ensure ‘Maintain aspect ratio’ is checked and then enter a smaller horizontal % and click ‘OK’
- To save the new image, click ‘File’ > ‘Save’
- Go to Windows Explorer and check if the image is now below 2.5MB