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There are many online OCR input websites. For example: http://www.yibizi.com/html5/ (neat and fast, without ads, but seems only working inside China) I strongly suggest you install a client software rather than using a website because many websites are full of ads. And many of them are only working in some particular browsers, like infamous IE series. ...
http://jingyan.baidu.com/article/a17d5285399a948099c8f243.html If your OS is Windows 7, you can use "Tablet PC Input Board".
I think this meets your need: http://tegaki.org/
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