SnapOtter/apps/docs/tools/video/watermark-video.md

description

description
Burn a text watermark onto video frames.

Watermark Video

Burn a text watermark onto every frame of a video with configurable position, size, opacity, and color.

API Endpoint

POST /api/v1/tools/video/watermark-video

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

Parameters

Parameter	Type	Required	Default	Description
text	string	Yes	-	Watermark text (1-200 characters)
position	string	No	"br"	Position on the frame: tl, tc, tr, l, c, r, bl, bc, br
fontSize	integer	No	36	Font size in pixels (8-120)
opacity	number	No	0.5	Watermark opacity (0.05-1)
color	string	No	"#ffffff"	Hex color for the text (e.g. "#ffffff")

Position Values

• tl - Top left, tc - Top center, tr - Top right
• l - Middle left, c - Center, r - Middle right
• bl - Bottom left, bc - Bottom center, br - Bottom right

Example Request

curl -X POST http://localhost:1349/api/v1/tools/video/watermark-video \
  -H "Authorization: Bearer si_your-api-key" \
  -F "file=@clip.mp4" \
  -F 'settings={"text": "PREVIEW", "position": "c", "fontSize": 48, "opacity": 0.3}'

Example Response

{
  "jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
  "downloadUrl": "/api/v1/download/a1b2c3d4-e5f6-7890-abcd-ef1234567890/clip.mp4",
  "originalSize": 12500000,
  "processedSize": 12400000
}

Notes

• The watermark is permanently rendered into the video frames and cannot be removed after processing.
• The watermark uses a sans-serif font built into FFmpeg.
• For image watermarks, use the image Watermark tool instead.