Image to COCO JSON Converter

Convert images to COCO JSON format by drawing bounding boxes and adding annotations for object detection datasets.

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4,256+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

User Satisfaction

Worked Example & Common Values

Below is a sample worked calculation demonstrating how Image to COCO JSON Converter processes input data instantly inside your browser.

Sample Input Birth date: Jan 15, 1995, Target date: Oct 20, 2023

Computed Result Chronological Age: 28 Years, 9 Months, 5 Days (10,505 days elapsed)

Execution Mode Client-Side In-Browser JS

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About This Tool

This tool allows you to upload images, draw precise bounding boxes around objects, add category labels, and export the annotations in the standard COCO JSON format. It's ideal for creating training datasets for computer vision models, supporting multiple annotations per image with detailed metadata. The tool provides a user-friendly interface for annotation and generates fully compliant COCO JSON output.

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How to Use

Upload an image using the file upload area or drag-and-drop.
Use the drawing tools to create bounding boxes around objects in the image.
Enter category names and other annotation details in the form.
Click 'Generate COCO JSON' to convert your annotations.
View, copy, or download the resulting JSON file.

Frequently Asked Questions

Find Quick Answers

What is COCO JSON format?

COCO JSON is a standard annotation format used in computer vision for object detection datasets, containing image metadata, bounding boxes, and category labels.

Can I annotate multiple objects in one image?

Yes, you can draw multiple bounding boxes and assign different categories to each object within the same image.

What image formats are supported?

The tool supports common formats like JPG, PNG, and WebP for upload and annotation.

Is there a limit to the number of annotations?

No, you can add as many annotations as needed, and all will be included in the COCO JSON output.

Need to run multiple calculations?

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