Data Annotation
Data Annotation Services Built for Enterprise AI
Defined.ai delivers a global AI crowd service providing enterprise-grade data annotation services that combine expertise, diversity, and ethical working conditions competitively and at scale. Our human-in-the-loop workflows ensure accuracy, fairness, and transparency for every dataset.
1.6M+
500+
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Data Annotation You Can Trust at Scale
Enterprise-grade data annotation grounded in quality metrics, ethical sourcing, and global expertise.
Fully Human-in-the-Loop
End-to-end data annotation workflows led by humans to ensure quality control, scalability, and efficiency across complex AI use cases.
Worldwide, World-Class
Diverse contributors across countries, languages, and cultures to control bias and ensure expertise.
Ethical by Default
All data is fully consented for AI training and privacy protected.
Trusted and Transparent
Our vetted crowd is never anonymous—we know who they are and guarantee fair compensation.
Scalable and Secure
Receive datasets at any scale via secure API with real-time progress monitoring.
Proven Results
Clients achieve measurable improvements in data quality and efficiency.
Data Annotation Services Across All Modalities
We deliver annotation services for image, audio, text, video, and multimodal—ensuring accuracy and scalability for your AI training needs.
Audio Annotation
Transform raw audio into structured, labeled datasets for speech and language models:
Automatic Speech Recognition (ASR): Annotate transcripts for accurate speech-to-text conversion.
Human Transcription: High-quality manual transcription for nuanced language understanding.
Speaker Diarization: Identify and separate speakers in multi-party conversations.
Natural Language Annotation: Tag linguistic features like intent, sentiment, and tone.
Trusted by Leading AI innovators
Related Use Cases
Defined.ai enables organizations to build accurate, bias-aware AI through enterprise-grade data annotation for AI and machine learning. See more use cases
Proven Trust. Real Impact.
Real feedback from AI teams and enterprises using Defined.ai to power accurate, reliable, and scalable models.
We needed a highly specialized robotics dataset that no one else could provide. Defined.ai delivered 225 hours of annotated human demonstration data, complete with clips ranging from 30 seconds to 30 minutes under diverse conditions. Their ability to source multi-sensor hardware kits gave us flexibility and confidence throughout the project.
Learn More About Data Annotation
Dive into blogs, case studies, and resources that showcase real-world impact.
What is Data Annotation?
Discover the foundational role of data annotation in machine learning with Defined.ai
How Image Annotation Teaches Machines to See
Discover how image annotation is training AI to interpret and understand visual data.
Embrace the Future: AI-driven Asset Management for Business Efficiency and Growth
Learn how Defined.ai helped EDP optimize operations, reduce costs, and gain a competitive advantage by implementing an AI-driven asset management
What is Data Annotation?
Discover the foundational role of data annotation in machine learning with Defined.ai
How Image Annotation Teaches Machines to See
Discover how image annotation is training AI to interpret and understand visual data.
Embrace the Future: AI-driven Asset Management for Business Efficiency and Growth
Learn how Defined.ai helped EDP optimize operations, reduce costs, and gain a competitive advantage by implementing an AI-driven asset management
Questions? We’ve Got You Covered.
Find quick answers about our AI data solutions, custom services, delivery models, and commercial terms. Explore the full FAQ
We support annotation for image, audio, text, video, and multimodal datasets, including advanced tasks like semantic segmentation, speaker diarization, and cross-modal linking.
Our human-in-the-loop workflows combine expert annotators with automated checks, multi-layer validation, and real-time monitoring to guarantee accuracy and consistency.
Yes. All projects follow ISO-certified processes and are fully GDPR and HIPAA compliant, ensuring data privacy and regulatory adherence.
Absolutely. We deliver millions of annotations at scale through our global crowd of 1.6M+ vetted contributors, supported by secure API integrations and enterprise-grade reporting.
We source contributors from 150+ countries and 500+ languages, ensuring cultural and linguistic diversity. Our workflows include bias detection and fairness checks at every stage.