ImagePDF Image to PDF OCR Converter is capable of converting scanned image to searchable PDF document with the embedded OCR technology. It is a kind of command line application which can realize different kinds of functions when you make the conversion.
Please download Image to PDF OCR Converter by clicking here and there is no need any installation steps except extracting the ZIP file to some location of your computer. Then you will be able to use the program to convert scanned image to searchable PDF document at once. The executable file pdf2imgocr.exe is the called program in the conversion.
If you don’t know how to use this command line application, please drag the file image2pdfocr.exe to MS-DOS interface and hit Enter button to see its usage like the snapshot shown in Figure 1. 
Figure 1
If you want to write the command line, you need to refer to the following template:
img2pdf [options] <Image-file> [<PDF-file>]
There are some examples for your reference to convert scanned image to searchable PDF document.
img2pdfocr.exe –ocr -width 612 -height 792 C:\in.tif C:\out.pdf
img2pdfocr.exe –ocr -mergepdf "C:\1.pdf|C:\2.pdf|C:\3.pdf" C:\out.pdf
img2pdfocr.exe –ocr C:\*.tif C:\*.pdf
In the first example, you can convert scanned TIF image to searchable PDF document with the option –ocr and also set the PDF page size as 612x792 by the option –width and –height.
In the second example, the command line program merge all converted searchable PDF document together with the option –mergepdf.
In the third example, the program convert scanned image to searchable PDF document in batches with the help of the option –ocr and wildcard.
At last, please hit Enter button to run the conversion. There are more information about the program Image to PDF OCR Converter and you can click here to enter its homepage to learn more features and functions about it.