Watermark PDF

Stamp a text watermark on every page of a PDF with configurable position, size, opacity, and rotation.

API Endpoint

POST /api/v1/tools/watermark-pdf

Accepts multipart form data with a PDF file and a JSON settings field.

Parameters

Parameter	Type	Required	Default	Description
text	string	Yes	-	Watermark text (1-200 characters)
position	string	No	"c"	Placement on the page: tl, tc, tr, l, c, r, bl, bc, br
fontSize	integer	No	48	Font size in points (6-72)
opacity	number	No	0.3	Watermark opacity (0.05-1)
rotation	number	No	45	Rotation angle in degrees (-180 to 180)

Position Values

• tl top-left, tc top-center, tr top-right
• l center-left, c center, r center-right
• bl bottom-left, bc bottom-center, br bottom-right

Example Request

curl -X POST http://localhost:1349/api/v1/tools/watermark-pdf \
  -H "Authorization: Bearer si_your-api-key" \
  -F "[email protected]" \
  -F 'settings={"text": "CONFIDENTIAL", "position": "c", "opacity": 0.2, "rotation": 45}'

Example Response

{
  "jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
  "downloadUrl": "/api/v1/download/a1b2c3d4-e5f6-7890-abcd-ef1234567890/document.pdf",
  "originalSize": 2450000,
  "processedSize": 2500000
}

Notes

• The watermark is rendered as a text overlay on each page.
• The same watermark text, position, and style are applied uniformly to all pages.
• Use lower opacity values (0.1-0.3) for subtle watermarks that do not obscure content.