To convert a handwritten PDF to a searchable document, you can use a tool such as Adobe Acrobat, Online OCR tool, iLovePDF OCR PDF, Coolmuster PDF to Word Converter, Microsoft Word, Google Docs, or PDF2GO. These tools allow you to upload your PDF, and then use Optical Character Recognition (OCR) technology to recognize the text in the handwritten document and convert it into searchable text. You can then save the converted document as a searchable PDF. Some of these tools may offer a free trial, but may charge for unlimited use. It is important to note that the accuracy of the OCR technology may vary depending on the quality of the handwriting and the specific tool being used.