If you don’t specify the parameter, the path defaults to the current folder of the app. For example, if the path to the tessdata folder is c:\MyApp\tessdata\ the path passed in the dataPath parameter should be c:\MyApp\. The path should end with a trailing backslash. This is either a full path, or a relative path. dataPathThis is a path to the parent folder of the tessdata folder – the folder where the language data files are. You can download Tesseract language modules here. Note: the tessdata folder should contain data files for all languages you use in the OCR. In our case we just stick with English, which is also the default language of the OCR engine. More languages also mean lower OCR quality. You can recognize multi-language documents, but the more languages you include, the more memory the app consumes. LanguageThis parameter specifies the language or languages for OCR. However, other tasks may require them, so we provide a brief description of what can be passed to Init here. In fact, you can call Init without any parameters at all (see below). ![]() We don’t need all of these parameters to convert a scanned PDF to the searchable one in our example. OcrEngineMode oem = OcrEngineMode.OEM_DEFAULT, Enable required namespacesTo turn a scanned PDF to the searchable one, we need to use the following namespaces: This allows a user to view and read the document as before, but also enables them to search the text, select it, copy selection to the clipboard and so on. We take the scanned pages of the original PDF, recognize them using the OCR (optical character recognition) library and add an invisible layer to the PDF file that contains all the recognized text in addition to the main visible layer with scanned pages. ![]() To learn how to create a PDF from scanned pages, please read this tutorial instead. This tutorial explains how you can turn the scanned PDF to the searchable document using the PDFium C# library and Tesserat. You cannot select text on a scanned page or copy some fragment to the clipboard. Scanned PDF documents are great for reading, but fail to deliver anything beyond that. Doing so will effectively lock a PDF file from being edited altogether the full How to Lock a PDF from Editing tutorial is available on our blog to assist you.How to Make a Searchable PDF from Scanned Pages The most common method would be to convert it to a JPG file, which turns the content into an image again. Once you make a PDF searchable, you can also reverse this process in two different ways. You’ll learn that we’re a more affordable and yet just as effective alternative. And if you’re a current user of another PDF provider, such as Adobe Acrobat, do check out our pricing. Text layers and formatting will be retained as needed. On top of that, you can also merge, split, rotate, and add additional text to your editable PDF with Smallpdf. You also remove the usage limits and gain access to all Pro features, such as advanced editing, faster upload speeds, and strong compression mode in our PDF compressor. With a trial, you’ll gain unrestricted and unlimited access to the OCR option to make PDF files searchable by recognizing text. ![]() You can give it a try for free, though, with a 7-day free trial. However, our OCR option is a Pro feature. The converters on our website are free for limited use, at no cost. Can I Convert a PDF to a Searchable PDF for Free? With this tool, a searchable PDF will be created, free of charge. In case you need another party to open the PDF files in a search-only state, you can use the Word to PDF tool to convert scans back to PDF format.
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