(Disclaimer: I work for creatale GmbH) As you mentioned ocrad.js I assume you search for something in js/nodejs. Many others already recommended tesseract and

(Disclaimer: I work for creatale GmbH) As you mentioned ocrad.js I assume you search for something in js/nodejs. Many others already recommended tesseract and OpenCV. We have built a library around tesseract for character recognition and OpenCV (and other libraries) for preprocessing, all for node.js/io.js: https://github.com/creatale/node-dv https://github.com/creatale/node-dv If you have to recognize forms or other structured images, we also created a higher-level library: https://github.com/creatale/node-fv https://github.com/creatale/node-fv