Developer & Technical Tools
Web
Desktop
image annotation
dataset labelling
YOLO export
COCO export
bounding box
polygon segmentation
keypoints
whole-image classification
computer vision
local-first
crash-safe journal
CNN Image Labeler
CNN Image Labeler is a single-user, local-first image annotation application for building computer-vision training datasets. Point it at any folder of images, define your own classes in the UI, draw polygon/box/point annotations or apply whole-image tags, and export directly to YOLO segmentation, YOLO detection, or COCO JSON. Labels are stored in a portable sidecar directory beside the images with a crash-safe append-only journal.
// blueprint contents
The full blueprint is in the download.