From virtual assistants to in-car navigation systems, all sound-activated machine learning systems rely on a foundation of diverse, high-quality audio data. The data collection process is a common roadblock in applying deep learning to speech and other audio recognition problems.

Lionbridge enables machine learning teams to quickly create model-ready audio datasets across 300+ languages and dialects. Whether you’re looking for professionally recorded speech data, a platform to annotate audio files, or need a remote crowd to conduct software testing, Lionbridge is your home for audio data outsourcing.

Our Audio Data Platform


Collect, annotate, and validate diverse audio data with our flexible software platform.

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


With over two decades of hands-on experience preparing data for machine learning, Lionbridge has helped the world’s largest technology brands train, test, and fine-tune their audio-based applications.


Our crowd of highly skilled and specialized language professionals are located across the globe, providing access to a huge volume of audio data across 300+ languages and dialects.


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


Our Audio Data Services

Audio & Speech Data Collection

Quickly gather and measure multilingual audio samples to enhance voice-enabled machine learning software. Working with Lionbridge unlocks access to a network of 500,000+ qualified linguists, in-country speakers, and experienced project managers capable of collecting audio and speech data for a range of use cases.


Audio Transcription

Order audio, phonetic and video transcription services in over 300+ languages and dialects. In addition to standard transcription services, Lionbridge provides support for multilingual audio, time stamping, speaker identification, and support for different file types.


Audio Classification

Collect and classify audio samples into predetermined categories with Lionbridge’s data classification services. From acoustic data classification to sales call analysis, Lionbridge can quickly annotate audio files based on your project specifications.


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

how to crowdsource data

Speech Data Collection Case Study

Learn how we helped one of the world’s largest technology companies train its voice-based search engine to be fluent in 30 languages.

  • 240 Hours of high-quality ambient noise
  • 20 Hours of speech samples
  • 30 Languages
  • Speakers Ages 6-75


Audio Solutions Lionbridge can Improve

Text-to-Speech (TTS)

Build a text-to-speech system that can generate realistic speech in multiple languages.

Automatic Speech Recognition (ASR)

Improve accuracy for automatic speech recognition systems using labeled speech data produced by a diverse set of speakers.

Virtual Assistants

Train your virtual assistant to recognize and respond to human speech in a variety of languages, environments and contexts.


Audio Data Pricing

How much does audio training data cost?
The Lionbridge platform streamlines much of data collection process, allowing us to offer one of the most cost-effective audio data 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 Audio Data Services

Lionbridge provides professional audio training data services in over 300 languages. Some of our most popular languages include:

  • Chinese audio data services
  • Dutch audio data services
  • French audio data services
  • German audio data services
  • Italian audio data services
  • Japanese audio data services
  • Portuguese audio data services
  • Spanish audio data services