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The #1 Rated Speech-to-Text API

Automatically transcribe audio and video files. Powered by Deep Learning. Trusted by thousands of developers and startups.
Trusted by thousands of developers, startups, and Fortune 500 companies in production.
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See what developers are building with AssemblyAI's speech recognition API

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Powerful Deep Learning. Simple API.

Easily convert audio and video to text with our simple Speech-to-Text API. Powered by advanced Deep Learning.
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AssemblyAI Speech-to-Text API speaker diarization
Speaker Diarization
Know who spoke when
AssemblyAI Speech-to-Text API PII redaction
PII Redaction
Detect and remove credit card numbers, SSNs, and more
AssemblyAI Speech-to-Text API automatic transcript highlights
Automatic Transcription Highlights
Surface the most common keywords and phrases
AssemblyAI Speech-to-Text API 99% uptime
99.9%+ Uptime
Trusted in production to handle millions of transcriptions each day
AssemblyAI Speech-to-Text API model customization
Model Customization
On-the-fly add keywords and phrases unique to your application or customers
AssemblyAI Speech-to-Text API entity detection
Entity Detection
Detect things like names, injuries, and places spoken in the text
AssemblyAI Speech-to-Text API speaker diarization
Advanced Security and Data Privacy Protocols
We never store your data, and follow strict security protocols within our systems
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Why AssemblyAI

We’re a Deep Learning company, obsessed with moving the State of the Art forward, and giving developers access to great AI tech

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Fastest-improving Speech Recognition accuracy
Our research team deploys weekly accuracy improvements to our Speech Recognition models, and is constantly pushing the State of the Art.
In-house research team
We conduct our own research, and publish leading papers and blogs about the state of Automatic Speech Recognition.
99.9+ uptime
Our Speech-to-Text API operates with 99.9%+ uptime, and processes millions of audio file every single day.
More than Speech-to-Text
Top-rated Speech Recognition accuracy along with sentiment analysis, PII redaction, topic detection, summarization, and more.