Convert AMR to captions

Sonix transcribes your AMR file and creates closed captions that make your content accessible to everyone.

ADA compliant
5-min turnaround
Accessible
Audio
Video
DOCX
SRT/VTT
PDF
53+ Languages
About This Format

Understanding AMR files

What is a AMR file?

Speech-optimized mobile audio format

AMR was adopted as the standard speech codec by the 3rd Generation Partnership Project Group (3GPP)and is now widely used in GSM and UMTS for 3G mobile phones and devices.
The Adaptive Multi-Rate (AMR) audio file format that is optimized for speech coding. Thus, most audio saved in the AMR file format is compressed and optimized for human speech frequency ranges. Thus, the AMR speech codec consists of a multi-rate narrowband speech codec that encodes narrowband (200–3400 Hz) signals at variable bit rates ranging from 4.75 to 12.2 kbit/s with normal quality speech starting at 7.4 kbit/s. Since it is used mainly for mobile speech communication, it chooses between the 8 different bit rates based on link conditions.

Common Uses

  • Voice recordings on mobile
  • Voicemail messages
  • GSM phone calls

Audio Quality

Designed for speech; may struggle with music or ambient audio

Transcription Tips for AMR

  • Optimized for speech - works well for voice transcription
  • Limited frequency range may affect music transcription

Where AMR Files Come From

  • Android voice recorders
  • Mobile phone voicemail
  • 3G phone recordings
10x
Faster than real-time
Get your AMR captions in minutes
99%
Accuracy rate
Industry-leading AI for AMR files
53+
Languages
Captions in any language
30+
Export formats
SRT, VTT, SCC, and more
How It Works

Create captions from AMR in 6 steps

Step 1

Create account

Sign up for Sonix's free trial. Includes 30 minutes free.

Step 2

Upload file

Upload your AMR file from your computer or cloud storage.

Step 3

Select language

Choose from 53+ languages spoken in your file.

Step 4

Auto-transcribe

Sonix AI transcribes your AMR with word-level timestamps.

Step 5

Edit captions

Fine-tune timing and formatting for accessibility.

Step 6

Export

Download closed captions in SRT, VTT, or SCC format.

Common Questions

Everything about AMR captions

Can you create closed captions from AMR files?

Yes! Sonix transcribes your AMR file with precise timestamps and creates closed captions in standard formats.

What's the difference between subtitles and closed captions?

Closed captions include non-speech elements like [music], [applause], and speaker identification. They're designed for deaf and hard-of-hearing viewers.

Are Sonix captions ADA compliant?

Yes! Sonix captions meet accessibility requirements when properly reviewed and edited. Our editor helps ensure timing and accuracy standards.

What caption formats are supported?

Export captions as SRT, VTT, SCC (for broadcast), and other formats. Each format has specific use cases.

Can I add sound descriptions?

Yes! Use our editor to add [music], [laughter], and other non-speech descriptions for full accessibility.

Do captions help with SEO?

Absolutely! Captions make your video content searchable and improve accessibility, both of which can boost SEO rankings.

Why Sonix

Accessible captions from AMR files

Accessibility First

Create captions that make your content accessible to deaf and hard-of-hearing viewers.

ADA Compliant

Meet accessibility requirements with properly formatted closed captions.

Sound Descriptions

Add non-speech elements like [music] and [applause] for full context.

SEO Benefits

Captions make video content searchable and improve discoverability.

Related

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Reviews

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Sonix is amazing. It’s like adding the most brilliant brain to my staff.
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Phillip M.
Bothell, WA USA
Sooooooooooo easy to use and accurate.
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Jennifer K.
Seattle, WA USA
You guys were SO easy to use. Competitors made my life so complicated but you guys were a breeze to work with!
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Mariana G.
Mexico City, Mexico
I love how quick, affordable and accurate it is, but what I like MOST is that the words are highlighted as the recording speaks them!
AT
Alex T.
Knoxville, Tennessee
Sonix saves me 60% of the time editing. No more manual trascription nightmare with writing down timecodes, and sending emails. I think you are changing the game here! Bravo :)
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Jan S.
Brno, Czechnia
Sonix is so easy to use, and the quality is impressive in almost all languages we have tested so far. Punctuation is especially amazing compared to other platforms, even the tech g...
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Lucia G.
Barcelona, Spain
Sonix is a very user-friendly platform, and they are very transparent about what is included in the monthly fee... It's transcribed very fast and is quite ...
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Chrissy M.
Portland, OR, USA
The interface and editor experience were great. I also like the way you handle speaker identification and naming. Pretty slick. Nice timestamp frequency / formatting too.
JD
JP D.
Ottawa, Ontario Canada
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