Scanning quality is just as important as faxing, and not all apps do it well. I tested several before finding a good option. A big help was
https://geekflare.com/software/best-fax-iphone-apps/ , which reviews fax apps for iPhones in 2025 and mentions scan quality. From personal experience, the recommended apps produce clean scans and accurate text alignment. I now scan and fax documents directly from my iPhone without needing a separate scanner. It’s efficient and works well for both personal and professional use.