Image Annotation - Free Tool for COCO & YOLO Export

AI Training Data Generator for Computer Vision and Image Machine Learning

Free Image Annotation Tool for Machine Learning

The best free image annotation tool for creating machine learning datasets. This image annotation tool requires no signup. Add image metadata and export in COCO JSON, YOLO, or HuggingFace format. Perfect for image machine learning projects.

Use our free image metadata tool to organize and label your training data efficiently.

Features

  • Polygon Annotation - Draw precise boundaries around objects
  • Bounding Box - Quick rectangle annotations for object detection
  • COCO JSON Export - Industry standard format for computer vision
  • YOLO Format Export - Ready for YOLO model training
  • HuggingFace Export - JSONL format for diffusion models
  • Medical Image Labeling - Histopathology, pathology, microscopy support
  • Colony Tracking - Time-lapse comparison for cell growth analysis
  • Auto-Annotation - AI-powered cell detection with Cellpose

Use Cases

  • Object Detection Dataset Creation
  • Medical Image Annotation - Tumor, Tissue, Cell Labeling
  • Histopathology Slide Annotation
  • Scientific Research Data Labeling
  • Computer Vision Model Training
  • Stable Diffusion & AI Art Training Data

How to Use

  1. Upload your image (JPG, PNG, TIFF supported)
  2. Select annotation tool: Area, Rectangle, Circle, Pin, or Arrow
  3. Draw annotations and add labels
  4. Export in your preferred format (COCO, YOLO, HuggingFace)

Why Choose This Tool?

Unlike LabelStudio, LabelMe, Roboflow, or VGG Image Annotator, this tool is completely free, requires no signup, and runs entirely in your browser. Your images stay private - nothing is uploaded to servers unless you choose to save to your account.