DataX Annotation

DataX Annotation is a professional data annotation company headquartered in Hanoi, Vietnam, serving AI and machine learning teams worldwide.

We specialize in six core annotation services: NLP and text annotation, image annotation, video annotation, audio annotation, 3D point cloud annotation, and document and OCR annotation. Our clients include AI startups, research labs, and enterprise product teams building computer vision, natural language processing, autonomous vehicle, and conversational AI systems.

Founded by a leadership team with deep roots in IT outsourcing and AI services, DataX Annotation was built to solve a problem we saw repeatedly in the market: AI teams struggling to find an annotation partner they could trust for both quality and communication. We built our operation around two non-negotiables, 99% accuracy on client validation sets and full transparency throughout every project.

Our annotation workflow combines expert human annotators with AI-assisted pre-labeling and multi-pass quality control. Every project includes inter-annotator agreement tracking, structured QA reviews, and audit-ready reporting.

We support RLHF and instruction tuning datasets for LLM fine-tuning, medical imaging annotation, multilingual NLP annotation across English, Vietnamese, Thai, Malay, and Mandarin, and complex multimodal annotation pipelines. We serve clients across the US, UK, Australia, Singapore, Germany, Japan, New Zealand, and beyond. Being based in Vietnam gives our clients a meaningful cost advantage without compromising on quality, and our APAC timezone positioning makes us a natural fit for teams building AI products for Southeast and East Asian markets.

Key services: Data annotation, data labeling, NLP annotation, image annotation, video annotation, audio annotation, 3D point cloud annotation, RLHF training data, LLM fine-tuning datasets, medical image annotation, and multilingual annotation.