Text Watermark
Add a text watermark overlay to images. Supports single placement at corners/center or tiled repetition across the entire image, with configurable font size, color, opacity, and rotation.
API Endpoint
POST /api/v1/tools/watermark-text
Accepts multipart form data with an image file and a JSON settings field.
Parameters
| Parameter | Type | Required | Default | Description |
|---|---|---|---|---|
| text | string | Yes | - | Watermark text (1 to 500 characters) |
| fontSize | number | No | 48 | Font size in pixels (8 to 1000) |
| color | string | No | "#000000" | Text color in hex format (#RRGGBB) |
| opacity | number | No | 50 | Text opacity percentage (0 to 100) |
| position | string | No | "center" | Placement: center, top-left, top-right, bottom-left, bottom-right, tiled |
| rotation | number | No | 0 | Text rotation angle in degrees (-360 to 360) |
Example Request
bash
curl -X POST http://localhost:1349/api/v1/tools/watermark-text \
-H "Authorization: Bearer si_your-api-key" \
-F "[email protected]" \
-F 'settings={"text": "SAMPLE", "fontSize": 64, "opacity": 30, "position": "center", "rotation": -30}'Tiled watermark across the entire image:
bash
curl -X POST http://localhost:1349/api/v1/tools/watermark-text \
-H "Authorization: Bearer si_your-api-key" \
-F "[email protected]" \
-F 'settings={"text": "DRAFT", "fontSize": 36, "opacity": 20, "position": "tiled", "rotation": -45}'Example Response
json
{
"jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
"downloadUrl": "/api/v1/download/a1b2c3d4-e5f6-7890-abcd-ef1234567890/photo.jpg",
"originalSize": 2450000,
"processedSize": 2480000
}Notes
- The watermark is rendered as SVG text and composited onto the image, preserving output quality.
- Tiled mode spaces text elements based on font size (6x horizontal, 4x vertical spacing), capped at 500 elements maximum.
- For corner positions, padding from the edge equals the font size.
- The font used is the system's default sans-serif font.
- XML-special characters in the text (
&,<,>,",') are safely escaped. - Output format matches the input format. HEIC, RAW, PSD, and SVG inputs are automatically decoded before processing.