If you want to scan paper documents to PDF using iPhone, you can choose the Scanner Pro app. We have demonstrated how easy it can help us scan documents to PDF on iPhone. This PDF scanner app supports both auto and manual scanning modes. By default the automatic scanning is activated so users can easily scan multi-page documents as they don’t have to manually press the scan or shutter button for each page to scan. Scanner app can automatically detect borders, correct distortion and geometry, remove shadows, etc.
Sometimes however when you scan in low light, or the scanner can’t capture high quality scans, you may want to disable the auto scanning and enable the manual scanning mode. Tap the Auto at the top right corner to switch to Manual.
The change of scanning mode will retain until you manually change them.