If using a scanner, check to see if your scanner is equipped with the feature OCR. OCR stands for Optical Character Recognition. This feature will scan your document as text searchable.
Below are Instructions for Adobe Acrobat Professional and Standard:
Click on Tools >
Recognize Text >
In This File.
The Recognize Text popup box opens.
Select All pages, then click OK.

www.smallpdf.com
https://freepdfonline.com
https://www.onlineocr.net
www.pdf2go.com/create-searchable-pdf
Please Note: We cannot help with technical assistance on any 3rd party websites or provide assistance with a scanner.