Developer API
Integrate Sonix's industry-leading transcription directly into your applications, workflows, and business processes. Fast, accurate, and built for developers.
Three steps to integrate Sonix
Create account
Sign up for free. Every trial account includes 30 minutes of free transcription. No credit card required.
Get your API key
Log into your account and generate your API key to access our API endpoints.
Generate API keyStart integrating
Read our detailed API documentation and start testing. Build powerful integrations in minutes.
Read API docsEverything you need to
automate your workflow with Sonix
Best-in-class accuracy
Our advanced speech-to-text algorithms deliver industry-leading accuracy. Test us against any competitor—we're confident you'll see the difference.
Lightning-fast transcription
Our powerful AI and optimized infrastructure transcribe a 15-minute file faster than it takes to play. Get results in minutes, not hours.
Simple, affordable pricing
Pay only for what you use with transparent per-minute pricing. No hidden fees, no complicated tiers. The same rates as our web interface.
View pricingUpload any audio or video
We support all common audio and video formats. Upload MP3, MP4, WAV, M4A, and dozens more.
Flexible output formats
Get transcripts as JSON, plain text, SRT, VTT, DOCX, or PDF. Access word-level timestamps, speaker labels, and confidence scores.
Webhooks & callbacks
Receive notifications when transcriptions complete. No polling required—we'll call your endpoint with the results automatically.
Connect with Zapier
Don't want to write code? Connect Sonix to thousands of apps with Zapier. Automate your transcription workflow without writing a single line of code.
Frequently Asked Questions
about our speech-to-text API
How do I get started with the Sonix API?
Create a free Sonix account, then generate your API key from your account settings. Our API documentation includes quickstart guides and code samples in multiple languages.
What audio and video formats does the API support?
The API supports all common formats including MP3, MP4, WAV, M4A, MOV, WEBM, OGG, and many more. You can upload files directly or provide a URL for us to fetch.
How is API usage billed?
API usage is billed the same as web uploads—per minute of audio transcribed. There are no separate API fees or surcharges. Your existing Sonix balance works for both.
What output formats are available?
You can retrieve transcripts as JSON with full metadata, plain text, SRT or VTT subtitles, Word documents, or PDF. The JSON response includes word-level timestamps and speaker identification.
Does the API support real-time transcription?
Yes, Sonix offers both batch and real-time streaming transcription APIs. Contact our sales team for real-time API access and pricing information.
Is there rate limiting on the API?
Standard accounts have generous rate limits suitable for most use cases. Enterprise customers can request higher limits. See our API documentation for current limits.
How companies use the
Sonix speech-to-text API
Media & Content Platforms
Automatically generate subtitles and closed captions for video content at scale. Media companies use our API to process thousands of hours of video daily, making content accessible and improving SEO. Integrate directly into your CMS or video pipeline to add captions the moment new content is uploaded.
- Auto-generate SRT/VTT subtitles for video libraries
- Create searchable transcripts for on-demand content
- Support 53+ languages for global audiences
Call Centers & Customer Service
Transcribe every customer interaction for quality assurance, compliance, and training. Our API processes call recordings in real-time or batch, extracting insights from conversations at scale. Identify trends, flag compliance issues, and coach agents based on actual call data.
- 100% call coverage for compliance and QA
- Speaker diarization identifies agent vs. customer
- Integrate with CRM and analytics platforms
Healthcare & Medical Documentation
Transcribe clinical consultations, patient dictations, and medical conferences with HIPAA-compliant infrastructure. Healthcare organizations use our API to reduce documentation burden, allowing clinicians to focus on patient care. Export directly to EHR-compatible formats.
- HIPAA-compliant with BAA available
- Medical vocabulary for accurate terminology
- EHR-ready export formats
Research & Market Analysis
Transform hours of interviews, focus groups, and user research sessions into searchable, analyzable text. Research teams use our API to accelerate qualitative analysis, processing hundreds of interviews in the time it used to take to transcribe one. Speaker labels and timestamps make analysis effortless.
- Batch process hundreds of research interviews
- Speaker identification for multi-participant sessions
- Export with timestamps for easy citation
Ready to integrate Sonix?
Get your API key today and start building. Free trial includes 30 minutes of transcription.
