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

More ways to convert AMR files

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Other file formats

MUS to text
MP2 to text
WMA to text
AU to text
WEBA to text
WAV to text
FLAC to text
MPGA to text
AIFC to text
AIF to text
See all supported file formats
Reviews

Trusted by accessibility teams

4.98 rating from 211 reviews

This is the best software I've used for transcription. Really happy about that!
LP
Lakshmi P.
Bengaluru, India
I absolutely loved how well the software was able to distinguish between individual speakers. Exceptional product and well-polished.
MB
Michael B.
Tampa, FL, USA
This technology managed to shock me! It saved me so much time and effort!
KU
Kaan U.
Wassenaar, Netherlands
I found out out you guys because I had to do some transcribing for me yearbook class and my friend recommended you guys. It was a very easy process and it took hours off the time I had to a...
TM
Tracy M.
Brooklyn, NY USA
I have a 30-40 minute commute to work and like to dictate memos and other brief documents along the way–but I haven't had an easy way to get them transcribed...until now. Thanks Sonix!
ND
Nick D.
Waterloo, Ontario Canada
One of the best sites/services on the Internet I've ever tried.
ML
Matteo L.
Brescia, Italy
Works very well with Arabic voices.
MA
Mohamed A.
Dubai, UAE
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 ...
CM
Chrissy M.
Portland, OR, USA
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Create AMR captions now

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