What is Data Annotation?
It’s simply not enough to give a computer a large amount of data and expect it to learn – data has to undergo some preparation in order for computers to find patterns and inferences within it. For machine learning models to learn efficiently and effectively, data annotation must be accurate and relevant to the task the machine is being asked to perform. For this reason, large scale human-annotation services are key to successful machine learning. Lionbridge AI provides high-quality data annotation services for machine learning use cases. Our network of 500,000+ qualified annotators processes millions of data points to build premium ground truth data for text, images, videos, and audio across 300+ languages.
Why Lionbridge?
No matter what your needs are, the Lionbridge platform is capable of processing all kinds of text, image, video and audio data requests.
- 500,000+ Contributors
- 300+ Languages
- 20+ Years of experience
Expertise
With 20+ years of experience, Lionbridge provides data annotation solutions to the world’s largest companies.
Quality
The Lionbridge quality assurance system features built-in validation, spot-checking and a workers seniority system to ensure the highest quality data to train machine learning applications.
Scale
With access to a crowd of 500,000+ qualified annotators in 300+ languages, Lionbridge can quickly process hundreds of thousands of data rows so your models get the information they need to work in the real world.
Our Data Annotation Services
Text Annotation
With a background in natural language and linguistics, Lionbridge is a well equipped to handle any kind of text annotation project. Whether you’re training an entity extraction system or sentiment analysis tool, our curated crowd can accurately label text data in 300+ languages and dialects.
Audio Annotation
Develop, calibrate, and improve voice-enabled applications with outsourced audio annotation services. Lionbridge’s network of 500,000+ qualified linguists, in-country speakers and experienced project management team has deep experience collecting and annotating audio data for machine learning.
Image Annotation
Our qualified contributors source, annotate, and prepare images for input into machine learning software. Power your computer vision models to recognize and process visual data with meticulously tagged image data.
Video Annotation
Build comprehensively labeled video datasets with Lionbridge’s suite of video annotation services. From object localization to video tracking, Lionbridge has the experience and technology necessary to serve all of your video annotation needs.
How does Lionbridge’s Data Annotation Services work?

1. Project set-up
Our team will work with you to develop a custom solution based on your project objectives and timeline.


2. Production
Our crowd of multilingual experts get to work evaluating and reviewing your advertisements.


3. Delivery
Our project management team check, package and format the data before being sent to you for final approval.

Sentiment Analysis Case Study
Learn how Lionbridge helped one of the world’s biggest technology companies collect and annotate 20,000+ text records to train their text analysis engine.
- 20,000+ Text Records
- 14 Languages
- 1,000+ Hours of Word Completed
WE SUPPLY THE WORLD’S LEADING COMPANIES WITH OUTSOURCED DATA ANNOTATION SERVICES
Data Annotation Pricing
How much do data annotation services cost?
Our proprietary platform streamlines much of the annotation process, allowing us to offer the most cost-effective annotation solution in the industry.
Contact us to get a free estimate for your project.
- Account Manager
- Project Management
- 24/7 Support
- API
- NDA
- Volume pricing
- Custom reporting
- Enterprise-grade SLAs
- Custom invoicing
- Consulting services

Multilingual Data Annotation Services
Most other data annotation companies don’t support languages other than English at scale. By contrast, Lionbridge provides data annotation across 300+ languages and dialects. Some of our most popular languages include:
- Chinese data annotation
- Dutch data annotation
- French data annotation
- German data annotation
- Italian data annotation
- Japanese data annotation
- Portuguese data annotation
- Spanish data annotation