Watermark

Lay text across pages, at an angle and see-through. Free without an account; sign in to run it from your app too.

PDF file · 25 MB together

Text Font size (pt) Colour Opacity Angle (degrees) Pages Like "1-3, 5, 8-last". Empty: every page.

Result

The same with the API

curl https://pdfember.com/api/v1/tools/watermark \
  -H "Authorization: Bearer $PDFEMBER_KEY" \
  -F "files[][email protected]" \
  -F "text=CONFIDENTIAL" \
  -F "opacity=0.2" \
  -o out.pdf