As long as we have these apps installed on our device, we can perform OCR at anytime anywhere without staying online.
While offline OCR refers to desktop or mobile software to perform OCR even without accessing to Internet. Online OCR refers to web-based OCR services that perform OCR on uploaded files online, then save the output documents to local hard drive of a device, users have to access to Internet and upload the files to 3rd party server which stores those files for 24 hours or more. There are both online and offline OCR tools. It will make these files to digital copies of readable and searchable texts. OCR, which is Optical Character Recognition, it is the technology to recognize text from a image-based file (scanned PDFs, images) or paper documents.
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