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Convert annotation formats

How to Convert LabelMe JSON to OpenAI GPT-4o Object Detection JSONL

In this guide, we show you how to convert data between the LabelMe and OpenAI Object Detection JSONL formats for free. You can use your converted data to train models and other models that support the OpenAI Object Detection JSONL format.

LabelMe JSON

The native format of LabelMe, an open source graphical image annotation tool written in Python and available for Windows, Mac, and Linux.

Below, learn the structure of LabelMe JSON.

labelme.chess.jsonJSON
{
  "version": "4.5.6",
  "flags": {},
  "shapes": [
    {
      "label": "black-bishop",
      "points": [
        [
          250.5,
          44.0
        ],
        [
          285.0,
          112.5
        ]
      ],
      "group_id": null,
      "shape_type": "rectangle",
      "flags": {}
    },
    {
      "label": "white-knight",
      "points": [
        [
          128.5,
          44.0
        ],
        [
          168.5,
          110.5
        ]
      ],
      "group_id": null,
      "shape_type": "rectangle",
      "flags": {}
    },
    {
      "label": "white-king",
      "points": [
        [
          110.5,
          153.5
        ],
        [
          160.0,
          253.5
        ]
      ],
      "group_id": null,
      "shape_type": "rectangle",
      "flags": {}
    },
    {
      "label": "white-bishop",
      "points": [
        [
          91.0,
          295.0
        ],
        [
          136.5,
          366.0
        ]
      ],
      "group_id": null,
      "shape_type": "rectangle",
      "flags": {}
    },
    {
      "label": "white-pawn",
      "points": [
        [
          242.0,
          253.5
        ],
        [
          277.5,
          306.5
        ]
      ],
      "group_id": null,
      "shape_type": "rectangle",
      "flags": {}
    },
    {
      "label": "white-queen",
      "points": [
        [
          317.0,
          33.0
        ],
        [
          357.0,
          117.0
        ]
      ],
      "group_id": null,
      "shape_type": "rectangle",
      "flags": {}
    },
    {
      "label": "white-bishop",
      "points": [
        [
          367.5,
          1.5
        ],
        [
          401.0,
          69.5
        ]
      ],
      "group_id": null,
      "shape_type": "rectangle",
      "flags": {}
    },
    {
      "label": "black-rook",
      "points": [
        [
          484.5,
          56.5
        ],
        [
          522.5,
          113.0
        ]
      ],
      "group_id": null,
      "shape_type": "rectangle",
      "flags": {}
    },
    {
      "label": "black-king",
      "points": [
        [
          557.0,
          108.0
        ],
        [
          614.5,
          206.0
        ]
      ],
      "group_id": null,
      "shape_type": "rectangle",
      "flags": {}
    },
    {
      "label": "black-pawn",
      "points": [
        [
          384.0,
          153.0
        ],
        [
          412.5,
          204.5
        ]
      ],
      "group_id": null,
      "shape_type": "rectangle",
      "flags": {}
    },
    {
      "label": "black-bishop",
      "points": [
        [
          388.5,
          242.0
        ],
        [
          428.0,
          310.5
        ]
      ],
      "group_id": null,
      "shape_type": "rectangle",
      "flags": {}
    },
    {
      "label": "black-pawn",
      "points": [
        [
          517.5,
          249.5
        ],
        [
          553.0,
          303.5
        ]
      ],
      "group_id": null,
      "shape_type": "rectangle",
      "flags": {}
    },
    {
      "label": "black-knight",
      "points": [
        [
          466.5,
          356.5
        ],
        [
          516.0,
          430.5
        ]
      ],
      "group_id": null,
      "shape_type": "rectangle",
      "flags": {}
    }
  ],
  "imagePath": "0af.jpg",
  "imageData": "/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAgGBgcGBQgHBwcJCQgKDBQNDAsLDBkSEw8UHRofHh0aHBwgJC4nICIsIxwcKDcpLDAxNDQ0Hyc5PTgyPC4zNDL/2wBDAQkJCQwLDBg...",
  "imageHeight": 512,
  "imageWidth": 765
}

OpenAI GPT-4o Object Detection JSONL

The format required by OpenAI for fine-tuning GPT-4o for object detection.

Below, learn the structure of OpenAI GPT-4o Object Detection JSONL.

JSON
{
  "messages": [
    {"role": "system", "content": "You are a helpful assistant."},
    {"role": "user", "content": "detect "},
    {
      "role": "user",
      "content": [
        {
          "type": "image_url",
          "image_url": {
            "url": "URL"
          }
        }
      ]
    },
    {
      "role": "assistant",
      "content": " object ;  object" } ] }

The loc tags correspond with the locations of objects in images. Individual annotations are separate by semi-colons, following the structure:

loc-tags class-name; loc-tags class-name;

Step 1: Create a free Roboflow public workspace

Roboflow is a universal conversion tool for computer vision annotation formats. The Public plan is the best way for those exploring personal projects, class assignments, and other experiments to try Roboflow. To convert your dataset, start by creating a free workspace on the Public plan.

Create Roboflow Workspace

Step 2: Upload your data into Roboflow

Once your account has been created, click Create New Project.

Roboflow's create project form, with Object Detection selected as the project type

Upload your data to Roboflow by dragging and dropping your LabelMe JSON images and annotations into the upload space.

Roboflow's upload page, with a drag-and-drop area for images, annotations, videos and PDFs

Step 3: Generate Dataset Version

Next, click "Generate New Version" to generate a new version of your dataset:

Roboflow's Generate a Dataset Version page, showing the source images and train/test split for a new version

You can then apply any preprocessing or augmentation steps to your dataset:

The augmentation step of a new dataset version, with 90° Rotate and Brightness added

Step 4: Export Dataset Version

After generating, you will be prompted to Export your dataset. You can choose to receive your dataset as a .zip file or a curl download link. Choose OpenAI GPT-4o Object Detection JSONL when asked in what format you want to export your data. You will see a dropdown with various options like this:

Roboflow's Download dialog, with the export format list open and COCO highlighted

Congratulations, you have successfully converted your dataset from LabelMe JSON format to OpenAI GPT-4o Object Detection JSONL format!

Video Tutorial

Convert Computer Vision Annotation Formats Tutorial

Want to dive deeper into converting annotation formats with Roboflow? In the tutorial below, we explore how to convert your data in the Roboflow dashboard. We also discuss rejecting annotations and train-test-validation splits.

Frequently Asked Questions

Yes! It is free to convert LabelMe JSON data into the OpenAI GPT-4o Object Detection JSONL format on the Roboflow platform.

If you have between a few and a few thousand images, converting data between these formats will be quick. But, the time it takes to convert between data formats increases with the more images you have.

Show guide

Convert LabelMe JSON to other formats

Convert other formats to OpenAI GPT-4o Object Detection JSONL

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