To get the best results please follow the below guideline.

Resolution: 1920×1080 or 1920×1410. If the document image is not cropped, it should fill in 90% of this space.

Image Format: JPEG

Image Compression: Recommended 100 or at least 90% as it will affect OCR reading.

Sending uncropped document images:

Swift

request.isExtracted = false 

Preferred orientation: