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Convert PDF to Searchable PDF ​

Overview ​

To make a searchable PDF by adding invisible text to an image based PDF such as a scanned document using OCR.

Set Transparent Text Layer ​

When outputting a searchable PDF, you can use the following option to control the hidden text layer:

  • TransparentText: Whether to output a transparent text layer.

Sample ​

Full code sample which shows how to use the ComPDF OCR module on scanned documents in multiple languages.

c#
string inputFilePath = "***";
string password = "***";
string outputFileName = "***";
PdfOptions pdfOptions = new PdfOptions();
pdfOptions.EnableOCR = true;
pdfOptions.Languages = new List<OCRLanguage> { OCRLanguage.e_ENGLISH };
ErrorCode error = CPDFConversion.StartPDFToSearchablePDF(inputFilePath, password, outputFileName, pdfOptions);