Convertio
This extension converts from one file format to a different file format. If you look at the company’s website, it converts a ton of file formats and works with a number of major cloud services. This technology comes in very handy when you are organizing electronic documents, or you need to convert to the right format for a text reader. The extension gets excellent reviews.
https://chrome.google.com/webstore/detail/convertio/eppjkefeiehhflmgkhdooajgbkkegpcl?hl=en
OCR Converter - OCR Software
This extension will convert a picture, video, or PDF to text and then translate it into a number of languages.
Copyfish Free OCR Software
This extension will copy text from video, pictures, or PDF for various uses.
Project Naptha
This is an OCR reading app.
https://chrome.google.com/webstore/detail/project-naptha/molncoemjfmpgdkbdlbjmhlcgniigdnf