{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://raw.githubusercontent.com/api-evangelist/pdfshift/refs/heads/main/json-schema/watermarkform.json",
  "title": "WatermarkForm",
  "type": "object",
  "properties": {
    "source": {
      "type": "string",
      "description": "PDF source. Must be a valid URL or a base64 encoded PDF document."
    },
    "image": {
      "type": "string",
      "description": "Image source for watermark."
    },
    "text": {
      "type": "string",
      "description": "Text to use as watermark."
    },
    "font_size": {
      "type": "integer",
      "minimum": 5,
      "maximum": 300,
      "default": 16,
      "description": "Font size for text watermark (5-300)."
    },
    "font_family": {
      "type": "string",
      "enum": [
        "Helvetica",
        "Times",
        "Courier"
      ],
      "default": "Helvetica",
      "description": "Font family for text watermark."
    },
    "font_color": {
      "type": "string",
      "pattern": "^#?[0-9a-fA-F]{3}([0-9a-fA-F]{3})?$",
      "default": "000000",
      "description": "Font color in hexadecimal (e.g. #000000 or 000000)."
    },
    "font_opacity": {
      "type": "integer",
      "minimum": 0,
      "maximum": 100,
      "default": 100,
      "description": "Font opacity percentage (0-100)."
    },
    "font_bold": {
      "type": "boolean",
      "default": false,
      "description": "Bold font for text watermark."
    },
    "font_italic": {
      "type": "boolean",
      "default": false,
      "description": "Italic font for text watermark."
    },
    "offset_x": {
      "type": "string",
      "default": "center",
      "description": "Horizontal offset: 'left', 'right', 'center', or value ending with px/in/cm/mm/pt."
    },
    "offset_y": {
      "type": "string",
      "default": "middle",
      "description": "Vertical offset: 'top', 'bottom', 'middle', or value ending with px/in/cm/mm/pt."
    },
    "rotate": {
      "type": "integer",
      "minimum": -359,
      "maximum": 359,
      "default": -45,
      "description": "Rotation angle for watermark (-359 to 359)."
    }
  }
}