What is Handwritten Data Collection?

Handwritten data collection is the first step to build training datasets to train Optical Character Recognition (OCR) systems to recognize and understand written text.

Handwritten character recognition is a field of research within computer vision that aims to extract information from typed, handwritten or printed text. Optical character recognition engines bridge the gap between humans and machines by allowing all forms of unstructured text data to be edited, searched, indexed and retrieved. Developing handwritten OCR models with high accuracy is still an open problem for researchers and companies alike due to a lack of high-quality training data.

Lionbridge collects handwritten data for machine learning in over 300 languages. With over two decades of experience, Lionbridge develops, calibrates, and improves text-based machine learning applications for the world’s largest corporations.

Why Collect Text Data with Lionbridge?


The Lionbridge platform makes it easy to collect handwritten text samples from thousands of contributors.

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


Lionbridge has access to a global network of 500,000+ qualified contributors, allowing clients to quickly generate custom audio datasets in over 300+ languages and dialects.


The Lionbridge quality assurance system features built-in validation, spot-checking and a worker seniority system to ensure the highest quality data to train machine learning applications.


With over 20 years of hands-on experience collecting audio data for machine learning use cases, Lionbridge has gained the trust of the world’s largest corporations.


Our Handwritten Data Collection Services

Text Data Collection

Lionbridge makes it easy to collect and process handwritten text samples from thousands of native speakers worldwide. Quickly scale your handwritten text database in over 300+ languages.


Image Transcription

Extract text from images with Lionbridge’s transcription services. Lionbridge offers image transcription services for invoices, receipts, business cards, menus, forms, and more.


Linguistic Annotation

With a background in linguistics, Lionbridge is a well equipped to handle any kind of text annotation project. Our curated crowd of 500,000 annotators can accurately label text data in 300+ languages and dialects.


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 collecting, creating or annotating 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

Handwritten Data Collection Case Studies


Lionbridge transcribed hundreds of multilingual handwritten documents dating back hundreds of years, to help a non-profit organization train and build an optical character recognition model.


For an AI company, Lionbridge collected hundreds of samples of handwritten Japanese characters from native speakers. The data was used to train an OCR model to extract data from unstructured documents.


Handwritten Data Collection Pricing

How much does it cost to collect handwritten data?
The Lionbridge platform streamlines much of the data collection process, allowing us to offer the most cost-effective solution 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 Handwritten Data Collection Services

Lionbridge provides text data services in all major languages and dialects. Some of our most popular languages include:

  • Chinese handwritten data collection
  • Dutch handwritten data collection
  • French handwritten data collection
  • German handwritten data collection
  • Italian handwritten data collection
  • Japanese handwritten data collection
  • Portuguese handwritten data collection
  • Spanish handwritten data collection

Learn more about Handwritten Data Collection

Optical character recognition (OCR) is the technology that converts images to text and enables computers to extract text data from image files.
It's only logical to ask how much training data you need, but it can be a complicated question. Let's see why, before looking at ways to determine the right amount of data.
Where’s the best place to look for machine learning datasets for optical character recognition (OCR)? We combed the web to create the ultimate cheat sheet.