COCO Annotator

GitHub Support CommunityData labelling

COCO Annotator is a web-based image annotation tool designed for versatility and efficiently label images to create training data for image localization and object detection.

It provides many distinct features including the ability to label an image segment (or part of a segment), track object instances, labeling objects with disconnected visible parts, efficiently storing and export annotations in the well-known COCO format.

The annotation process is delivered through an intuitive and customizable interface and provides many tools for creating accurate datasets.


Several annotation tools are currently available, with most applications as a desktop installation. Once installed, users can manually define regions in an image and creating a textual description. Generally, objects can be marked by a bounding box, either directly, through a masking tool, or by marking points to define the containing area. COCO Annotator allows users to annotate images using free-form curves or polygons and provides many additional features were other annotations tool fall short.

1. Directly export to COCO format
2. Segmentation of objects
3. Ability to add key points
4. Useful API endpoints to analyze data
5.Import datasets already annotated in COCO format
6. Annotate disconnect objects as a single instance
7. Labeling image segments with any number of labels simultaneously
8. Allow custom metadata for each instance or object
9. Advanced selection tools such as, DEXTR, MaskRCNN and Magic Wand
10 .Annotate images with semi-trained models
11. Generate datasets using google images
12. User authentication system

Official website

Tutorial and documentation

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