You can scan a document and convert the text into data that you can edit with a word processing, spreadsheet, or HTML-editing program. This process is called OCR (Optical Character Recognition).
To scan and use OCR, you need to install an OCR program, such as ABBYY FineReader.
In Mac OS X 10.6/10.7/10.8, you can use ABBYY FineReader to convert scanned documents to editable text by first using an application such as Image Capture. Scan and save your document in Image Capture, then open ABBYY FineReader, open the Get Images From pop-up menu, and select File. Select the conversion option you want to use, then select your scanned file and follow the instructions on the screen.