Add Watermark to Image

Data Generator Image Generator Credits / request: 5

Adds logo or text watermark to images.

POST https://api.apikodu.com/api/v1/imagegenerator/addwatermark

Documentation

Overview

Draws a text watermark on an image.

Authentication

Every request requires the x-api-key header. Credits used and remaining quota are returned in response headers (x-api-credits-used, x-api-remaining-credits, x-rate-limit-*).

Request

POST https://api.apikodu.com/api/v1/imagegenerator/addwatermark

JSON body; imageBase64 is sent from a file in the playground.

Parameters

Name	Type	Required	Default	Options	Description
`imageBase64`	string	* Required	—	—	Source image (base64, data URI allowed).
`text`	string	* Required	—	—	Watermark text.
`position`	string	Optional	`BottomRight`	`TopLeft` `TopCenter` `TopRight` `CenterLeft` `Center` `CenterRight` `BottomLeft` `BottomCenter` `BottomRight`	Position.
`fontSizePercent`	integer	Optional	`5`	—	Font size percent of the short edge. 1–100.
`fontColor`	string	Optional	`#FFFFFF`	—	Text color (hex).
`opacity`	integer	Optional	`50`	—	Opacity %. 0=transparent, 100=opaque.
`marginPercent`	integer	Optional	`3`	—	Edge margin percent.
`bold`	boolean	Optional	`false`	`true` `false`	Bold text.
`outputFormat`	string	Optional	—	`png` `jpeg` `webp`	Empty → png.
`quality`	integer	Optional	`90`	—	JPEG/WebP quality 1–100.

Response

Name	Type	Description
`downloadUrl`	string	Signed download URL. Becomes invalid after expires.
`format`	string	Output format: png, jpeg or webp.
`width`	integer	Output width in pixels.
`height`	integer	Output height in pixels.
`sizeBytes`	integer	Output file size in bytes.
`expires`	number	Unix epoch expiry of the download URL (seconds).

Errors

HTTP	code	Description
`400`	`-210`	text is empty.
`400`	`-204`	Image missing, invalid base64, empty, over size/resolution limit, or unsupported format (png/jpeg/webp). Resize: width/height missing, or both required for Constant/InsideFixed.
`400`	`-206`	outputFormat is not png, jpeg, jpg or webp.
`500`	`-207`	Output could not be stored.
`500`	`-208`	Download URL could not be created.
`401`	`-100`	x-api-key is missing, empty, malformed, inactive, banned, expired, IP-restricted, or not allowed for this API.
`429`	`-221`	Per-minute request limit exceeded. Response headers: x-rate-limit-limit, x-rate-limit-remaining, x-rate-limit-reset.
`429`	—	Package credit quota cannot cover this request. Body may be { error, limit, currentUsage, requestCost } (no code field).
`500`	`-1`	Unexpected server error. message is a generic error text without technical details.

Notes

Success body is { data: { ... } }. Error body is { code, message }. code is an ApiResponseCode enum value (negative integer).

Sample response

{
  "data": {
    "downloadUrl": "https://files.erseapi.com/images/sample/output.png?X-Amz-Expires=86400",
    "format": "png",
    "width": 800,
    "height": 600,
    "sizeBytes": 48210,
    "expires": 1771891200
  }
}

Code samples

  
      const response = await fetch('https://api.apikodu.com/api/v1/imagegenerator/addwatermark', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'x-api-key': 'YOUR_API_KEY'
        },
        body: JSON.stringify({
          name: 'example',
          value: 123
        })
      });

      const data = await response.json();
      console.log(data);

  
      import requests

      headers = {
          'Content-Type': 'application/json',
          'x-api-key': 'YOUR_API_KEY'
      }

      payload = {
          'name': 'example',
          'value': 123
      }

      response = requests.post('https://api.apikodu.com/api/v1/imagegenerator/addwatermark', headers=headers, json=payload)
      data = response.json()
      print(data)

  
      using var client = new HttpClient();
      client.DefaultRequestHeaders.Add("x-api-key", "YOUR_API_KEY");

      var payload = new { name = "example", value = 123 };
      var json = JsonSerializer.Serialize(payload);
      var content = new StringContent(json, Encoding.UTF8, "application/json");

      var response = await client.PostAsync("https://api.apikodu.com/api/v1/imagegenerator/addwatermark", content);
      response.EnsureSuccessStatusCode();

      var data = await response.Content.ReadAsStringAsync();
      Console.WriteLine(data);

 
     $data = [
         'name' => 'example',
         'value' => 123
     ];

     $response = file_get_contents('https://api.apikodu.com/api/v1/imagegenerator/addwatermark', false, stream_context_create([
         'http' => [
             'header' => "x-api-key: YOUR_API_KEY"
         ],
         'method'  => 'POST',"
         'content' => json_encode($data)
      ]));

      print_r(json_decode($response, true));

  
      curl -X POST 'https://api.apikodu.com/api/v1/imagegenerator/addwatermark' \
        -H 'Content-Type: application/json' \
        -H 'x-api-key: YOUR_API_KEY' \
        -d '{
          "name": "example",
          "value": 123
        }'

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