---
title: "Add a text or image watermark to an image"
method: POST
path: "/image-watermark"
tags: ["Images"]
---

# Add a text or image watermark to an image

`POST /image-watermark`

## Request

- Base URL: `https://api.cofferdock.com`
- URL: `https://api.cofferdock.com/image-watermark`
- Auth: API key in header `x-api-key`

Overlays text or a logo image onto a photo or image. Sibling of watermark_pdf, for a standalone image instead of a PDF.

Costs 1 credit per call.

## Request body

- object
  - `file` string, byte, required: The image to watermark, base64-encoded (e.g. PNG, JPEG or WebP).
  - `text` string: The watermark text, up to 200 characters. Provide text OR image, not both.
  - `image` string, byte: Logo image, base64-encoded. Provide text OR image, not both.
  - `position` 'center' | 'top-left' | 'top-right' | 'bottom-left' | 'bottom-right': Where the watermark goes: "center" (default), "top-left", "top-right", "bottom-left" or "bottom-right".
  - `opacity` number: Watermark opacity from 0.05 (almost invisible) to 1 (solid). Default 0.3.
  - `rotation` number: Rotation of the watermark in degrees (-360 to 360). Default 45 (diagonal); use 0 for no rotation.
  - `font_size` integer: Text only. Default: ~6% of the image width.
  - `color` string: Text only, hex.
  - `scale` number: Logo only: fraction of the image width.
  - `format` 'jpeg' | 'png' | 'webp' | 'avif': Output format (default: same as input).
  - `output` 'json' | 'binary' | 'url' | 'image': How to return the image: "json" (base64 in the JSON response), "binary" (the image itself, ready for n8n/Make/Zapier) or "url" (a temporary download link, valid 15 minutes). Default: json when the request is JSON, binary when the input was sent raw.

## Response `200`

The resulting image (shape depends on `output`).

- union
  - object
    - `success` boolean
    - `image` string, byte
    - `mime_type` 'image/jpeg' | 'image/png' | 'image/webp' | 'image/avif'
    - `meta` object
      - `size_bytes` integer
      - `type` string
      - `format` string
      - `width` integer
      - `height` integer
      - `used` integer: Credits used this month, after this call.
      - `remaining` integer, nullable: Credits left this month (null = unlimited).
      - `unlimited` boolean
  - object: Returned when output=url: a temporary download link (valid 15 minutes).
    - `success` boolean
    - `url` string, uri: Temporary download link. Expires in 15 minutes.
    - `expires_at` string, date-time
    - `mime_type` string
    - `size_bytes` integer
    - `meta` object
      - `used` integer: Credits used this month, after this call.
      - `remaining` integer, nullable: Credits left this month (null = unlimited).
      - `unlimited` boolean

## Other responses

- `400`: Invalid input (nothing is charged).
- `401`: Missing or invalid API key.
- `403`: Email not verified.
- `429`: Monthly credit limit reached, or too many requests per minute for this key (see Retry-After).
- `503`: Server busy (queue full). Retry after the seconds in the Retry-After header.

---

[API](https://skmtc.dev/cofferdock/apis/cofferdock-api.md) · [All operations](https://skmtc.dev/cofferdock/apis/cofferdock-api/llms.txt) · [OpenAPI document](https://skmtc.dev/cofferdock/apis/cofferdock-api/revisions/b57aa000d33a?raw)