If you have an image that contains text, FreeOnlineOCR is one of the quickest tools to convert it into text. It works with several image formats including JPG, GIF, PNG, BMP, TIFF and even PDF files. Simply upload your image, select the desired output format, click convert and the tool will convert your document into text.
http://www.makeuseof.com/dir/freeonlineocr-pdf-file-image-to-text/