Google Docs support OCR for PDF and Images
This feature only works for the following languages: English, French, Italian, German and Spanish. “For the technically curious: we’re using Optical Character Recognition (OCR) that our friends from Google Books helped us set up. OCR works best with high-resolution images, and not all formatting may be preserved.”, Google Docs Blog says.
for details, please visit Google Docs add OCR support to PDF and Images.
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View PDF, PPt and Tiff online with Google Docs, even you do not have a Google Account, http://blog.rubypdf.com/google-docs-viewer