What is PDF OCR?
OCR stands for optical character recognition, which is a type of software that can recognize different text characters in a scanned document based only on their optical properties. OCR can be used for PDF files, and is in fact very commonly used for such files because PDF is a very convenient format for scanned images. PDF OCR makes such files fully searchable and editable.
Where can you find free PDF OCR?
It can be costly to invest in an advanced OCR tool, so many people prefer to find a free tool if they only require a one-time use, or if they are unsure what their future requirements will be. A basic search reveals several free online tools, but the problem with most of these programs is that their accuracy is limited, and they cannot be used for bulk OCR.
Alternatives to online PDF OCR tools
Instead of relying on freeware, your best option is to find a professional OCR tool with good reviews, and to see if you can find a free trial version. Maestro Recognition Server from CVISION is one of the most accurate English language OCR tools on the market, and it is available in a trial version that you can download for free. You can download the trial and begin using it right away.