Image Annotation Services

Power your computer vision models with high-quality image datasets.

What is Image Annotation?

Image annotation is the process of adding labels to images to help train machine learning algrithms. With high-quality image datasets, you can train autonomous vehicles, drones, and other computer vision technology to interpret visual data in real time.

With our state-of-the-art annotation software and community of expert annotators, Lionbridge offers a wide variety of image annotation services for machine learning. Focus on developing your model, while our team gets to work tagging key objects and features in your images using the annotation method of your choice. Our AI slutions team will source professional annotators for your project, as well as create QA protocols and single or multi-pass annotation workflows. Offload your image annotation tasks to Lionbridge and let us provide the ground truth for your algorithm. 

Annotation Classification Transcription

We supply the world's leading companies with image annotation outsourcing

Our Image Annotation Services

2D Bounding Boxes

3D Bounding Boxes


Lines and Splines

Landmarks / Keypoints

Semantic Segmentation

Pixel-precise / Pixel-wise Segmentation


Image Classification Services

Lionbridge employs an image classification workflow that ensures accuracy while eliminating bias and human error. Our project managers assess the quality of the data all throughout the project. Based on your needs, we can employ inter-annotator agreement workflows to further ensure accurate classifications.

Image Transcription Services

Converting unstructured text data into a machine-readable format is necessary to train various text recognition algorithms. To help you build models that can analyze text in images, Lionbridge offers various image transcription services, including image captioning, OCR transcription, and handwritten data collection.

Our Image Annotation Tools

Create specialized image datasets on our data annotation platform.

Why Lionbridge?



Lionbridge has completed data collection projects for the world’s largest companies in over 300 languages worldwide. 


Our global community of contributors, computational linguists, and data scientists will provide you with the resources to collect data at scale.

Privacy and Security

Our global offices have multiple ISO certifications. We work hard to make sure your data and your client data is kept safe and secure.


20+ Years of Experience


1,000,000+ Multilingual contributors



50+ Offices worldwide

Case Studies


Landmark Annotation in Sports Images

A specialist team of Lionbridge’s contributors annotated 2,500 images with over 40,000 landmarks. The resulting data was used to build video tracking models for performance analysis.

“Many underestimate the technical infrastructure and operational excellence needed to get such high quality training data. Services like Lionbridge AI are great for engineering teams who need data fast and at scale.”

Dr. Rasmus Rothe, PhD (Computer Vision)
Founder, Merantix

Annotation support for any workflow


Work with our annotators


Expert Project Management

Guideline and taxonomy development

Access to 1 million annotators

Customized quality assurance

Delivery in any file format



Equip your annotation team


Licensed annotation platform

Subscription-based seating plan

24/7 customer support