Are online OCR engines as accurate as the ones you can purchase for your office?
In general, online tools are not as high in quality as the ones you can purchase, because paid toolkits are designed for professional use. However, if you are not sure about the features that you need in your OCR engine, I would recommend you try a free trial version of a professional tool, like Maestro Recognition Server from CVISION. You can then compare it with online tools and see what works best for you.
Download the free trial version of Maestro here: