PDF glossary
Optical character recognition (OCR)
Recognising the text in an image — such as a scanned page — and turning it into characters that can be searched, copied or edited.
A scanned PDF is a picture of a page: it has no text layer, so it can’t be searched or edited as text until OCR has recognised the characters in it.
In PDF-SDK
PDF-SDK does not include OCR: scanned pages stay images, so their text can’t be searched or edited.
What PDF-SDK doesLast reviewed