Bounding Box Method

Bounding Box image

The method can be used to bypass tasks where you need to select a specific object or draw a box around an object shown on an image.

Supported image formats: JPEG, PNG, GIF
Max file size: 600 kB
Max image size: 1000px on any side

BoundingBoxTask task type specification

Property Type Required Description
type String Yes BoundingBoxTask
body String Yes Image encoded into Base64 format. Data-URI format (containing data:content/type prefix) is also supported
comment String Yes* A comment will be shown to workers to help them to solve the captcha properly.
The comment property is required if the imgInstructions property is missing.
imgInstructions String Yes* An optional image with instruction that will be shown to workers. Image should be encoded into Base64 format. Max file size: 100 kB.
The imgInstructions property is required if the comment property is missing.

Request example

Method: createTask
API endpoint:

    "task": {
        "comment":"draw a tight box around the green apple"

Response example

    "errorId": 0,
    "status": "ready",
    "solution": {
        "bounding_boxes": [
                "xMin": 310,
                "xMax": 385,
                "yMin": 231,
                "yMax": 308
    "cost": "0.0012",
    "ip": "",
    "createTime": 1692863536,
    "endTime": 1692863556,
    "solveCount": 1