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SnapOtter d24e244af4 docs: organize tool pages by modality under /tools/<modality>/

Move all 157 tool pages into image/video/audio/pdf/data subfolders so URLs read /tools/<modality>/<id> (e.g. /tools/image/crop). Nest the image sub-categories under an Image group in the sidebar so the nav reads by modality. Add public/_redirects (301, clean + .html forms) mapping every old flat /tools/<id> URL to its new path so inbound links keep working. Rewrite all internal /tools links. Verified with a clean docs build (no dead links).

2026-06-18 14:12:28 +08:00

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description

description
Add a text watermark to every page of a PDF.

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/pdf/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/pdf/watermark-pdf \
  -H "Authorization: Bearer si_your-api-key" \
  -F "file=@document.pdf" \
  -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.

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