labelImg Next

labelImg Next is the new browser-based version of labelImg.

Start

On Windows, run the project from inside WSL (WSL2 recommended). Open a WSL terminal, switch to the repository there, and run all commands below from the Linux environment. On Linux, use the same steps directly.

Install backend dependencies:

python3 -m venv .venv
source .venv/bin/activate
pip install -r requirements.txt

Build the frontend:

cd frontend
npm install
npm run build

Run the application from the repository root:

source .venv/bin/activate
python main.py

Open in your browser from WSL or Windows:

• app: http://127.0.0.1:8000
• API docs: http://127.0.0.1:8000/docs

Development

Run backend:

source .venv/bin/activate
python main.py --reload