If your PDF file is a normal PDF file, not the scanned PDF nor image-based PDF file, then it is searchable already. You only need a PDF tool to search content in it. Then PDFelement is the tool that supports to search content within a PDF document. After opening your PDF file in it, click the Search button to search the keyword as you want. 2. If your PDF file is the scanned one or image-based one, then it is not searchable, and you need to use the OCR(optical character recognition) to make it searchable or editable. PDFelement also supports OCR function that can meet this needs. Get more details about how to convert PDF to searchable PDF.