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placeholders.dev

placeholders.dev

live Unverified (seed import) Developer Tools 2 tools imperative implementation

Generate fast placeholder images from a URL, powered by Cloudflare Workers in 333+ edge locations.

First seen 2026-08-31 · Last seen 2026-08-31 · Source: webmcp.com

Answer 1 · Act 1 · Transact 0 · Score: Not yet scored

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generate_placeholder_image_url

act imperative

Build a placeholders.dev image URL from a description of the placeholder wanted, such as "1200x630 dark social share image saying Hello World". Returns the URL plus ready-to-paste HTML and Markdown, and shows a preview on the page. Every value is validated the way the image API validates it, so an unusable color or font stack is reported rather than silently ignored.

Input schema

PropertyTypeRequiredDescription
width integer no Image width in pixels. Defaults to 300.
height integer no Image height in pixels. Defaults to 150.
text string no Text to draw on the image. Defaults to the image dimensions.
fontFamily string no Unquoted CSS font stack, e.g. `Inter, sans-serif`. Defaults to `sans-serif`.
fontWeight integer no Numeric font weight between 100 and 900. Keywords like `bold` are not accepted by the image API, use 700 instead. Defaults to bold.
fontSize integer no Font size in pixels. Defaults to 20% of the shortest image dimension.
dy number no Vertical nudge applied to the text baseline in pixels. Defaults to 35% of the font size.
bgColor string no CSS background color, e.g. `#313131` or `rgba(0,0,0,0.5)`. Defaults to `#ddd`.
textColor string no CSS text color. Use an rgba or hsla value for transparency. Defaults to `rgba(0,0,0,0.5)`.
darkBgColor string no CSS background color used when the viewer prefers a dark color scheme.
darkTextColor string no CSS text color used when the viewer prefers a dark color scheme.
textWrap boolean no Wrap long text onto multiple lines. Font size is not reduced, so very long strings can still overflow. Defaults to false.
Raw JSON schema
{
  "type": "object",
  "properties": {
    "width": {
      "type": "integer",
      "description": "Image width in pixels. Defaults to 300.",
      "minimum": 1,
      "maximum": 10000
    },
    "height": {
      "type": "integer",
      "description": "Image height in pixels. Defaults to 150.",
      "minimum": 1,
      "maximum": 10000
    },
    "text": {
      "type": "string",
      "description": "Text to draw on the image. Defaults to the image dimensions."
    },
    "fontFamily": {
      "type": "string",
      "description": "Unquoted CSS font stack, e.g. `Inter, sans-serif`. Defaults to `sans-serif`."
    },
    "fontWeight": {
      "type": "integer",
      "description": "Numeric font weight between 100 and 900. Keywords like `bold` are not accepted by the image API, use 700 instead. Defaults to bold.",
      "minimum": 100,
      "maximum": 900
    },
    "fontSize": {
      "type": "integer",
      "description": "Font size in pixels. Defaults to 20% of the shortest image dimension.",
      "minimum": 1,
      "maximum": 2000
    },
    "dy": {
      "type": "number",
      "description": "Vertical nudge applied to the text baseline in pixels. Defaults to 35% of the font size."
    },
    "bgColor": {
      "type": "string",
      "description": "CSS background color, e.g. `#313131` or `rgba(0,0,0,0.5)`. Defaults to `#ddd`."
    },
    "textColor": {
      "type": "string",
      "description": "CSS text color. Use an rgba or hsla value for transparency. Defaults to `rgba(0,0,0,0.5)`."
    },
    "darkBgColor": {
      "type": "string",
      "description": "CSS background color used when the viewer prefers a dark color scheme."
    },
    "darkTextColor": {
      "type": "string",
      "description": "CSS text color used when the viewer prefers a dark color scheme."
    },
    "textWrap": {
      "type": "boolean",
      "description": "Wrap long text onto multiple lines. Font size is not reduced, so very long strings can still overflow. Defaults to false."
    }
  }
}

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