With optical character recognition (OCR) technology, OCR software automatically extracts text from any scanned PDF or image file and OCR converts it to a searchable PDF file. With OCR software, you can transform a scanned PDF of a paper document into a text-searchable PDF document. This new OCR searchable PDF is like an image containing text data, that you will be able to search for a specific keyword. When we read a document, our brain recognizes a character by analyzing the patterns and compare them against the pre-learned alphabet set. An OCR software application is trying to do the exact same. An OCR software reads the text pixels from a scanned image and compares it against a pre-trained dataset. Once the text is recognized, it is added as a hidden layer in the scanned PDF. This new "sandwiched PDF" file is popularly known as a searchable PDF.
Nowadays it is very common for businesses to get scanned PDFs with multiple languages in them. Doing OCR or optical character recognition and make those scanned PDFs searchable can be a bit challenging since the OCR converter software that you use should be intelligent enough to differentiate characters from different languages. OCRvision supports multilingual OCR and it can be used to batch OCR scanned PDFs that contain more than one language. Our languages tab UI contains the list of OCR languages that our OCR application support. All you have to do is select the required language from this user interface. After this, OCRvision will automatically OCR and convert those multilingual scanned PDFs to searchable PDFs. Our searchable PDF converter software can help you to OCR scanned PDFs that contain multiple languages and make those scanned PDFs searchable.
A scanned PDF is not text searchable. It is mainly because a scanned PDF is an image of a text document embedded in a PDF. There is no character or other text information in that PDF document. A scanned PDF has to go through Optical Character Recognition (OCR) in order to make this PDF text searchable. You need the help of PDF OCR software to convert this scanned PDF to a searchable PDF. During this OCR process, the text information in the scanned image is analysed by OCR software. An OCR converter compares this character information against a pre-trained character set and does the “character recognition”. After this, an invisible text layer is added on top of the PDF scanned image. This new format in the form of a “sandwich PDF” is called a “searchable PDF”. It is called a searchable PDF because the text in this scanned PDF can be searched or indexed just like any other text document.