A Speech service feature that accurately converts spoken audio to text

Make spoken audio actionable

Quickly and accurately transcribe audio to text in more than 85 languages and variants. Customise models to enhance accuracy for domain-specific terminology. Get more value from spoken audio by enabling search or analytics on transcribed text or facilitating action – all in your preferred programming language.

High-quality transcription

Get accurate transcriptions with state-of-the-art speech recognition.

Customisable models

Add specific words to your base vocabulary or build your own models.

Flexible deployment

Run Speech to Text anywhere – in the cloud or at the edge in containers.


Access the same robust technology that powers speech recognition across Microsoft products.

Try Speech to Text with this demo app, built on our JavaScript SDK

To try out the demo with your own voice using a microphone, please change to a different browser that supports WebRTC, for example a recent version of Microsoft Edge, Firefox or Chrome.

Your speech data will not be stored

Transcribe speech accurately from various sources

Convert audio to text from a range of sources, including microphones, audio files and blob storage. Use speaker diarisation to determine who said what when. Get readable transcripts with automatic formatting and punctuation.

Customise speech models to your needs

Tailor your speech models to understand organisation- and industry-specific terminology. Overcome speech recognition barriers such as background noise, accents or unique vocabulary. Customise your models by uploading audio data and transcripts. Automatically generate custom models using Office 365 data to optimise speech recognition accuracy for your organisation.

Deploy anywhere, from the cloud to the edge

Run Speech to Text wherever your data resides. Build speech applications that are optimised for both robust cloud capabilities and edge locality using containers and language detection (preview). Speech containers support both standard and custom speech.

Comprehensive privacy and security

  • The Speech service, part of Azure Cognitive Services, is certified by SOC, FedRAMP, PCI DSS, HIPAA, HITECH and ISO.
  • Your data remains yours. Your audio input and transcription data aren’t logged during audio processing.
  • View and delete your custom speech data and models at any time. Your data is encrypted while it’s in storage.
  • Backed by Azure infrastructure, the Speech service offers enterprise-grade security, availability, compliance and manageability.

Flexible pricing gives you the power and control you need

Only pay for what you use, with no upfront costs. With Speech to Text, you pay as you go based on the number of hours of audio you transcribe.

Documentation and resources

Getting started

Read our documentation

Take the Microsoft Learn course

Explore code samples

Take a look at our sample code

See customisation resources

Customise your speech solution with Speech Studio. No code required.

Built with Speech to Text

KPMG streamlines call transcription

KPMG uses Speech to Text to transcribe and catalogue thousands of hours of calls, reducing compliance costs for its clients by as much as 80 per cent.


Motorola helps first responders access vital data using voice

Motorola Solutions is helping police officers and other emergency first responders gain faster access to important information with a voice-powered virtual assistant.

Motorola Solutions

Universal Electronics delivers voice-enabled smart home experiences

Universal Electronics is helping brands deliver voice-enabled navigation and control capabilities that work across everyday devices found in the home – offering a truly unique consumer experience.

Universal Electronics

Hochtief documents construction defects using voice

Hochtief is helping project managers identify and document construction defects at project sites with a voice-enabled virtual assistant.

Cheetah Mobile

NTT DATA accelerates decision-making with meeting insights

NTT DATA is unlocking insights from speech data with real-time meeting transcription. With Custom Speech, they are able to customise speech recognition models to understand organisation-specific terms.


Insight powers conversational banking experiences

Insight Enterprises is helping banks bring digital speed and convenience to their branches with a conversational AI-powered banking solution. Speech to Text converts what customers say into data that can be processed and analysed so that customers can get timely, relevant responses.

Insight Enterprise, Inc.

Get started with Speech