How do I delete text on a PDF file?

Use Preview:

1. Open PDF with Preview
2. Click “Show Markup Toolbar”
3. Select “Sketch” toolbar, then choose the “Border Color” as White, the text will be erased.

Assuming you have already tried a PDF editor, Does the PDF actually contain text? Depending on how it was created, it could just be a picture of text.

Open the PDF file in a PDF editing app and delete the text.