Best Image Annotation Tools in 2024

After human annotation is complete, a machine-learning model automatically examines the tagged pictures to generate the same annotations. Since the picture annotation defines the standards the model attempts to meet, any label mistakes are likewise replicated.

Image annotation is the process of labeling or categorizing an image with descriptive data that helps identify and classify objects, people, and situations included within the image.

Since it helps robots understand and interpret visual input, image annotation is vital in computer vision, robotics, and autonomous driving. An image may be annotated in many ways, such as by drawing bounding boxes around items, titling them, or segmenting them according to their visual characteristics.

Here are some best image annotation tools to check in 2024:

Markup Hero

Using Markup Hero, you can add labels and explanations to photos, highlight important details, draw attention to certain areas, and more. The application also allows users to resize, flip, and rotate images, making it easy to get the desired results.

Annotated images may be easily shared between users for commenting and discussion. Markup Hero is an easy-to-use, flexible, and powerful image annotation tool ideal for real-time collaborative and visual communication.


Keylabs enables users to annotate images with captions, tags, and other information, such as bounding boxes, important points, and semantic segmentation. Thanks to Keylabs, AI researchers and developers may save time annotating photos. Thanks to the platform’s comprehensive support for all image annotation styles and methods, developers have a wide range of options. Because of the software’s intuitive design, users may efficiently sort images into several categories. It allows users to collaborate and provides tools for managing processes and monitoring progress.

The program is also highly adjustable, with capabilities like developing unique annotation templates and personalized processes. Along with its annotation features, Keylabs provides in-built quality control measures to ensure the accuracy and consistency of annotations.


Labelbox is the most powerful vector labeling tool because of its ease of use, speed, and versatility. That also makes perfect logic in every way possible. Quickly get up and running, adapt to teams of any size, and generate high-quality training data with little effort. Labeling for object identification, semantic segmentation, and picture classification are just a few examples of how the annotations might be modified to fit the needs of a given project.

Labelbox enables several people to work together by assigning tasks, reviewing notes, and monitoring progress. It also provides quality assurance tools to make sure the labels are accurate and trustworthy. Dynamic filters that work on the content, data, or text embeddings allow you to effectively and rapidly tag relevant results at scale before sending them to a review queue.


The Scale image annotation tool allows users to add scale bars or rulers to a picture to provide a visual reference for item sizes. This is particularly useful for seeing photos of intricate structures, such as tiny animals or geological formations. Users may add text labels, arrows, and other shapes to photographs in the program to highlight certain aspects.

Pre-labeling, active tools like superpixel segmentation, and ML-based quality checks allow for large pictures’ accurate, rapid, and high-quality annotation. Combining image scaling tasks is possible. Image tasks may be set up to automatically construct a classification job with consensus if the target object is unknown.


Supervisely is a useful tool for annotating and labeling images and videos for use in machine vision applications. Object identification, segmentation, classification, and tracking are some annotation types that can be performed with the help of the platform’s intuitive interface. Supervisely’s powerful annotating engine simplifies annotation with features like automated polygonal segmentation, shape, text manipulation, and basic labeling.

Users of Supervisely may collaborate on a project by posting and reviewing annotations, comments, and draughts. Thanks to its compatibility with popular deep learning frameworks like TensorFlow, PyTorch, and Caffe, the platform allows users to export their annotations in several formats.


Scalability, flexibility, and ease of use were all design priorities. Using automatic annotations, which Scalabel facilitates, increases precision. Scalabel’s collaboration and version control support allows several developers to work concurrently on the same project. Quality assurance elements, including review, validation, and correction tools, are also included.

Scalabel stands out because it can communicate with other machine learning frameworks like TensorFlow, PyTorch, and Caffe to facilitate in-app model training. Annotation prediction between frames is flawless because of the combination of 3D Cloud and 2D Video Tracking.


RectLabel is an image labeling tool that helps annotate pictures for use in machine learning. The tool supports many annotations, including bounding boxes, polygons, and lines. The program is simple enough for anybody to use, allowing users to annotate photographs by drawing bounding boxes around interesting features.

RectLabel provides several features that enhance the reliability and productivity of the annotation process. High-quality annotations may be achieved since the tool offers fine-grained control over bounding box size and position. A smart tagging system also helps users save time while labeling by making suggestions based on past selections.

MakeSense.AI is a no-download, no-install internet application for labeling photographs. It is browser-based; therefore, there is no need for elaborate setup procedures. TensorFlow.js is one of the most popular frameworks for training neural networks, and it serves as the foundation for Makes Sense AI. The program is great for quickly testing picture annotation or small projects because of its accessible and simple features. MakeSense.AI, an online picture annotation tool, is free under the GPLv3 license.

CVAT – Computer Vision Annotation Tool

CVAT is a widely used open-source program for annotating images; Intel researchers developed it. CVAT is available to companies as part of the Viso Suite computer vision application suite. 5.7k Stars on GitHub As it is based on Github, this annotation tool needs to be manually installed. After it is set up, it offers more features and tools than others, such as shortcuts and the ability to create custom shapes for labels. TensorFlow Object Detection and Deep Learning Deployment Toolkit are only two of the many plugins that CVAT is compatible with.


LabelImg is a popular rudimentary graphical image annotation tool written in Python. 14.7k Favorites on GitHub The setup process is straightforward and can be completed in a few minutes using just a command prompt or terminal. The picture annotation tool is helpful in annotating datasets for object identification models, although it works best with smaller datasets (less than 10,000 photos) and needs a lot of human intervention. Because of its user-friendliness and extensive documentation, it is a great tool for novice ML programmers.

VGG Image Annotator (VIA)

The Visual Geometry Group (VGG) at Oxford University has released VGG Image Annotator (VIA), a free and open-source program for annotating images. It offers a straightforward user interface for drawing shapes on photos, whether points, lines, polygons, rectangles, or anything else. In addition, VIA enables users to annotate characteristics, providing further context for annotations.

Object identification, picture segmentation, and classification are just some of the many uses for VIA. CSV, JSON, and PASCAL VOC are annotated formats that may be imported and exported. VIA may be deployed locally or on a web server and can be modified to accommodate various annotation needs.


Dataturks is a service on the cloud that allows users to annotate images and identify data. Bounding boxes, polygons, and semantic segmentation are just some available annotations. To further guarantee precise annotations, it is equipped with quality assurance tools.

Integrations with well-known ML libraries like TensorFlow, PyTorch, and Keras are also available in Dataturks. Dataturks’ overarching goal is to improve the efficiency, simplicity, and accuracy with which data is annotated so that ML teams may devote their efforts to developing more effective models.


Roboflow is a service in the cloud that may be used to annotate and tag data. Annotation choices vary from polygons to semantic segmentation to bounding boxes. To further guarantee precise annotations, it is equipped with quality assurance tools.


Eagle is the best program for arranging pictures and concepts. To speed up the training of computer vision models, the tool streamlines the annotation of large datasets. Annotations may be seen and edited, progress can be tracked, and annotator quality can be verified inside the software.

Eagle has a welcoming interface that promotes collaboration. Several useful tools are available, such as importing and exporting datasets and organizing labeling activities. Eagle’s efficient organization features make locating a certain photo collection easy anytime. In addition, it allows you to preview the films without having to open them separately, thanks to its audio and video management features.


Hasty is an online annotation tool that utilizes AI to annotate photographs. The German firm employs “using AI to teach AI,” an approach that incorporates active learning to better your projected labels over time. The firm uses cutting-edge technology to develop superior algorithms and models.

Amazon SageMaker Ground Truth

Amazon SageMaker Ground Truth is an artificial intelligence-driven service that helps customers generate high-quality training data for ML algorithms. Image annotation, object recognition, and semantic segmentation are just a few of the features it provides.


Labellerr is a smart-feedback product driven by AI that automates the data pipeline of AI-first companies via computer vision AI. Bounding boxes, polygons, automatic item identification, and automated semantic segmentation are just some of the annotation options available. To further guarantee precise annotations, it is equipped with quality assurance tools.

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