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2. Smallpdf.com - Wikipedia

   en.wikipedia.org/wiki/Smallpdf.com

   Smallpdf is a Swiss online web-based PDF software, founded in 2013. [2] It offers free version with limited features to compress, convert and edit PDF documents. [3] And its paid version offers advanced features like OCR, compress, and more [4].

3. List of PDF software - Wikipedia

   en.wikipedia.org/wiki/List_of_PDF_software

   As with Adobe Acrobat, Nitro PDF Pro's reader is free; but unlike Adobe's free reader, Nitro's free reader allows PDF creation (via a virtual printer driver, or by specifying a filename in the reader's interface, or by drag-'n-drop of a file to Nitro PDF Reader's Windows desktop icon); Ghostscript not needed.

4. PDF - Wikipedia

   en.wikipedia.org/wiki/PDF

   Text in PDF is represented by text elements in page content streams. A text element specifies that characters should be drawn at certain positions. The characters are specified using the encoding of a selected font resource. A font object in PDF is a description of a digital typeface.

5. ABBYY - Wikipedia

   en.wikipedia.org/wiki/ABBYY

   ABBYY is an American technology company specializing in AI-powered document processing and automation, [2] [3] data capture, process mining and optical character recognition (OCR). [ 4 ] [ 5 ] [ 6 ] It was founded in the USSR and operated in Russia for nine years before moving to the United States.

6. Tesseract (software) - Wikipedia

   en.wikipedia.org/wiki/Tesseract_(software)

   Tesseract is an optical character recognition engine for various operating systems. [5] It is free software, released under the Apache License. [1] [6] [7] Originally developed by Hewlett-Packard as proprietary software in the 1980s, it was released as open source in 2005 and development was sponsored by Google in 2006.

7. OCRopus - Wikipedia

   en.wikipedia.org/wiki/OCRopus

   OCRopus can be used from the command line. Once installed, it can be invoked by specifying the input images. It will output the recognized text to standard output directly or write it as hOCR (HTML-based) code into files, from which it then can be transformed to a searchable PDF. If more precise control is needed, options can be specified on ...