PDF Replacer is a free software to find and replace text in bulk in PDF files. You can choose font types, remove text from PDF files using blank,etc.

If you want to extract highlighted text from PDF file as a plain text file, then this post covers some good free PDF Highlight Extractor software to do that.

There are few things worse than trying to copy a string of text from a PDF, only to find that you can't highlight any text at all. Thankfully, bypassing a locked PDF is easy enough to do on Mac.

Removing text from a PDF isn't as easy as drawing a black bar across it. Fortunately, redaction tools let you truly erase sensitive text in Preview, Adobe Acrobat DC Pro, and PDFPen.

Once the PDF loads, a selection of tools appears, including options to add text, highlight areas, draw with a freehand pen, or insert shapes and annotations.

Once the PDF opens, click the Markup tool (pencil icon inside a circle) to access the following annotation tools: Highlight Text: This tool lets you emphasize key information in the PDF.