🖍️ LabelImg is a graphical image annotation tool and label object bounding boxes in images

Project README


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LabelImg is a graphical image annotation tool.

It is written in Python and uses Qt for its graphical interface.

Annotations are saved as XML files in PASCAL VOC format, the format used by ImageNet <>__. Besides, it also supports YOLO and CreateML formats.

.. image:: :alt: Demo Image

.. image:: :alt: Demo Image

Watch a demo video <>__


Get from PyPI but only python3.0 or above

This is the simplest (one-command) install method on modern Linux distributions such as Ubuntu and Fedora.

.. code:: shell

    pip3 install labelImg

Build from source

Linux/Ubuntu/Mac requires at least `Python
2.6 <>`__ and has been tested with `PyQt
4.8 <>`__. However, `Python
3 or above <>`__ and  `PyQt5 <>`__ are strongly recommended.

Ubuntu Linux

Python 3 + Qt5

.. code:: shell

    sudo apt-get install pyqt5-dev-tools
    sudo pip3 install -r requirements/requirements-linux-python3.txt
    make qt5py3


Python 3 + Qt5

.. code:: shell

    brew install qt  # Install qt-5.x.x by Homebrew
    brew install libxml2

    or using pip

    pip3 install pyqt5 lxml # Install qt and lxml by pip

    make qt5py3

Python 3 Virtualenv (Recommended)

Virtualenv can avoid a lot of the QT / Python version issues

.. code:: shell

    brew install python3
    pip3 install pipenv
    pipenv run pip install pyqt5==5.15.2 lxml
    pipenv run make qt5py3
    pipenv run python3
    [Optional] rm -rf build dist; python py2app -A;mv "dist/" /Applications

Note: The Last command gives you a nice .app file with a new SVG Icon in your /Applications folder. You can consider using the script: build-tools/


Install `Python <>`__,
`PyQt5 <>`__
and `install lxml <>`__.

Open cmd and go to the `labelImg <#labelimg>`__ directory

.. code:: shell

    pyrcc4 -o libs/ resources.qrc
    For pyqt5, pyrcc5 -o libs/ resources.qrc


Windows + Anaconda

Download and install `Anaconda <>`__ (Python 3+)

Open the Anaconda Prompt and go to the `labelImg <#labelimg>`__ directory

.. code:: shell

    conda install pyqt=5
    conda install -c anaconda lxml
    pyrcc5 -o libs/ resources.qrc

Use Docker
.. code:: shell

    docker run -it \
    --user $(id -u) \
    -e DISPLAY=unix$DISPLAY \
    --workdir=$(pwd) \
    --volume="/home/$USER:/home/$USER" \
    --volume="/etc/group:/etc/group:ro" \
    --volume="/etc/passwd:/etc/passwd:ro" \
    --volume="/etc/shadow:/etc/shadow:ro" \
    --volume="/etc/sudoers.d:/etc/sudoers.d:ro" \
    -v /tmp/.X11-unix:/tmp/.X11-unix \

    make qt4py2;./

You can pull the image which has all of the installed and required dependencies. `Watch a demo video <>`__


Steps (PascalVOC)

1. Build and launch using the instructions above.
2. Click 'Change default saved annotation folder' in Menu/File
3. Click 'Open Dir'
4. Click 'Create RectBox'
5. Click and release left mouse to select a region to annotate the rect
6. You can use right mouse to drag the rect box to copy or move it

The annotation will be saved to the folder you specify.

You can refer to the below hotkeys to speed up your workflow.

Steps (YOLO)

1. In ``data/predefined_classes.txt`` define the list of classes that will be used for your training.

2. Build and launch using the instructions above.

3. Right below "Save" button in the toolbar, click "PascalVOC" button to switch to YOLO format.

4. You may use Open/OpenDIR to process single or multiple images. When finished with a single image, click save.

A txt file of YOLO format will be saved in the same folder as your image with same name. A file named "classes.txt" is saved to that folder too. "classes.txt" defines the list of class names that your YOLO label refers to.


- Your label list shall not change in the middle of processing a list of images. When you save an image, classes.txt will also get updated, while previous annotations will not be updated.

- You shouldn't use "default class" function when saving to YOLO format, it will not be referred.

- When saving as YOLO format, "difficult" flag is discarded.

Create pre-defined classes

You can edit the
`data/predefined\_classes.txt <>`__
to load pre-defined classes


| Ctrl + u           | Load all of the images from a directory    |
| Ctrl + r           | Change the default annotation target dir   |
| Ctrl + s           | Save                                       |
| Ctrl + d           | Copy the current label and rect box        |
| Ctrl + Shift + d   | Delete the current image                   |
| Space              | Flag the current image as verified         |
| w                  | Create a rect box                          |
| d                  | Next image                                 |
| a                  | Previous image                             |
| del                | Delete the selected rect box               |
| Ctrl++             | Zoom in                                    |
| Ctrl--             | Zoom out                                   |
| ↑→↓←               | Keyboard arrows to move selected rect box  |

**Verify Image:**

When pressing space, the user can flag the image as verified, a green background will appear.
This is used when creating a dataset automatically, the user can then through all the pictures and flag them instead of annotate them.


The difficult field is set to 1 indicates that the object has been annotated as "difficult", for example, an object which is clearly visible but difficult to recognize without substantial use of context.
According to your deep neural network implementation, you can include or exclude difficult objects during training.

How to reset the settings

In case there are issues with loading the classes, you can either:

1. From the top menu of the labelimg click on Menu/File/Reset All
2. Remove the `.labelImgSettings.pkl` from your home directory. In Linux and Mac you can do:
    `rm ~/.labelImgSettings.pkl`

How to contribute

Send a pull request

`Free software: MIT license <>`_

Citation: Tzutalin. LabelImg. Git code (2015).

Related and additional tools

1. `ImageNet Utils <>`__ to
   download image, create a label text for machine learning, etc
2. `Use Docker to run labelImg <>`__
3. `Generating the PASCAL VOC TFRecord files <>`__
4. `App Icon based on Icon by Nick Roach (GPL) <>`__
5. `Setup python development in vscode <>`__
6. `The link of this project on iHub platform <>`__
7. `Convert annotation files to CSV format or format for Google Cloud AutoML <>`__

Stargazers over time

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Open Source Agenda is not affiliated with "LabelImg" Project. README Source: tzutalin/labelImg
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