Modern phones, websites, and design tools produce different image formats. HEIC is common on iPhones, WebP is common on websites, JPG is accepted almost everywhere, and PNG is best for screenshots and graphics.
If a form rejects your photo, the file may be fine but the format may be unsupported. Convert HEIC or WebP to JPG for broad compatibility. Keep PNG for screenshots, logos, and images with sharp text.
Convert Image lets you change the format without starting over.