# Japan Data Annotation

> High-quality Japanese data annotation for LLMs, NLP, speech, vision and multimodal AI. Japan-based annotators, measurable QA and secure enterprise workflows.

Operated by CoDigital, Inc., Tokyo, Japan. The site is published in twelve
languages; English lives at the root and each other language under its own
prefix (for example https://data-annotation.codigital.co.jp/ja/). Every page below exists at every
language prefix.

Content notes for anyone quoting this site: quality figures shown in the sample
dashboard are illustrative sample data, labelled as such, and are not reported
results. The site claims no certifications, client names or accuracy
guarantees, and describes the ability to assemble domain-expert annotation
teams per project rather than a standing roster of licensed professionals.

## Start here

- [Home](https://data-annotation.codigital.co.jp/): The whole picture: Japanese expertise, capabilities, quality, security and how an engagement starts.
- [Services](https://data-annotation.codigital.co.jp/services/): The annotation and evaluation services, and how to tell which one a project needs.
- [Contact](https://data-annotation.codigital.co.jp/contact/): Start a scoped pilot, or send a security questionnaire. We reply within one business day.

## Services

- [LLM Training Data](https://data-annotation.codigital.co.jp/services/llm-training-data/): Instruction, preference and RLHF datasets written in Japanese, with the register decisions made explicitly.
- [LLM Evaluation](https://data-annotation.codigital.co.jp/services/llm-evaluation/): Human evaluation of Japanese model output — rubrics, pairwise preference, factuality and red teaming.
- [Speech & Audio](https://data-annotation.codigital.co.jp/services/speech-audio/): Japanese ASR transcription, diarization and intent labeling, with the normalization convention written down.
- [Image & Video](https://data-annotation.codigital.co.jp/services/image-video/): Bounding boxes, segmentation, OCR and document layout on Japanese images, video and paperwork.
- [Text & NLP](https://data-annotation.codigital.co.jp/services/text-nlp/): Entities, relations, intent and sentiment on Japanese text, with tokenizer boundaries decided rather than assumed.
- [Expert Annotation](https://data-annotation.codigital.co.jp/expert-annotation/): Annotation and evaluation with Japanese domain specialists, for AI working in regulated fields.

## Background and method

- [Japanese Data](https://data-annotation.codigital.co.jp/japanese-language-data/): A working guide to what makes Japanese hard for AI, and the guideline decisions each difficulty forces.
- [Industries](https://data-annotation.codigital.co.jp/industries/): Nine sectors, and the Japanese-language pitfalls specific to each one’s data.
- [Quality](https://data-annotation.codigital.co.jp/quality/): How annotation quality is defined, measured and reported — with the metrics explained rather than asserted.
- [Security](https://data-annotation.codigital.co.jp/security/): How client data is handled, and a plain statement of what we do and do not currently hold.

## Reference

- [FAQ](https://data-annotation.codigital.co.jp/faq/): Answers on scope, pricing, turnaround, Japanese coverage, quality, security and expert work.
- [Company](https://data-annotation.codigital.co.jp/company/): Corporate details for CoDigital, Inc., the company that operates this service.
- [Privacy Policy](https://data-annotation.codigital.co.jp/privacy/): What this website collects, why, how long it is kept and how to have it deleted.
- [Terms of Use](https://data-annotation.codigital.co.jp/terms/): The terms that govern use of this website, and what it does and does not constitute.