What is Linguistic Annotation?

Linguistic annotation, also known as corpus annotation, is the tagging of language data in text or spoken form. Linguistic annotation seeks to identify and flag grammatical, phonetic, and semantic linguistic elements within a body of text or audio recording. Utilizing our curated staff fluent in over 300 languages and dialects, Lionbridge can handle projects focusing on both major and niche languages at scale. We leverage our large crowd to find qualified annotators native in the language of your corpus or the target language of your NLP model.

Let Lionbridge annotate your data and provide your machine learning models with a solid ground truth.

Why use Lionbridge for Linguistic Annotation?


Whether you require a one-off linguistic annotation solution, a platform to annotate your data, or ongoing annotation services, Lionbridge is your home for linguistic annotation outsourcing.

  • 500,000+ Contributors
  • 300+ Languages
  • 20+ Years of experience


Our established quality assurance system features built-in validation, spot-checking, regular performance evaluations, and a worker seniority system to ensure the highest quality of data production.

Multilingual Experts

With a multicultural and multilingual crowd, Lionbridge is a leading linguistic annotation company. Our curated staff can accurately annotate your content in the language of your choice from one of our 300 supported languages.

Customizable Workflows

Need things done in a specific way under strict guidelines? We can work with you to make sure our team of experts gets your project done under your requirements and within your timeline.


Our Linguistic Annotation Services

Part of Speech Tagging (POS Tagging)

POS tagging, sometimes called grammatical tagging, is the process of labeling words in a line of text based on their function and relationship with adjacent words in the text.

Phonetic Annotation

Our staff meticulously labels the intonation, stress, and natural pauses in speech within your corpus.

Semantic Annotation

The annotation of word definitions, especially for homophones within the text or audio corpus.

Keyphrase Tagging

The location and annotation of relevant keywords or keyphrases in your text or audio data.

Discourse Annotation

The linking of anaphors and cataphors to their antecedent and postcedent subjects.
Ex: I dropped the glass. It shattered instantly.

How it Works

how to crowdsource data

1. Project set-up

Our team will work with you to develop a custom solution based on your project objectives and timeline.

how to crowdsource data
how to crowdsource data

2. Production

Our crowd of multilingual experts get to work creating, annotating, or validating your data.

how to crowdsource data
how to crowdsource data

3. Delivery

Our project managers check, package, and format the data before being sent to you for final approval.

how to crowdsource data

Success Stories

Linguistic Annotation Solutions We Serve

Chatbots & Virtual Assistants

Chatbots and virtual assistants rely on various NLP elements.
Use Lionbridge’s intent recognition, intent classification, and intent variation services to provide your algorithms with high-quality training data.

Search Engines

The search engine is often the first element users interact with on your site.
Lionbridge can evaluate your search engine results, titles, captions, and other elements to ensure your users are getting the best possible search experience.

Spam Filters

For automated spam filters and other content moderation solutions, Lionbridge can provide lexicons and aid in the creation of linguistic rules and grammar structures in various languages.
Use our services to create custom datasets to train your models to identify potentially sensitive or harmful content.

Machine Translation

With 20 years of specialization in linguistics and translation, Lionbridge can provide lexicons and grammar foundations for over 300 languages and dialects.
Use our multilingual crowd to provide your automated translation model with a solid ground truth.


Linguistic Annotation Services Pricing

How much do linguistic annotation services cost?
The Lionbridge platform streamlines much of the annotation process, allowing us to offer the most cost-effective linguistic annotation solutions 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
Get in touch with our team today

Multilingual Linguistic Annotation Services

Lionbridge provides professional linguistic annotation services in over 300 languages. Some of our most popular languages include:

  • Chinese linguistic annotation
  • Dutch linguistic annotation
  • French linguistic annotation
  • German linguistic annotation
  • Italian linguistic annotation
  • Japanese linguistic annotation
  • Portuguese linguistic annotation
  • Spanish linguistic annotation

Related Services

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