Convert AU to captions

Sonix transcribes your AU 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 AU files

What is a AU file?

Audacity project audio chunks

Audacity, an open source audio editor, breaks long tracks into small pieces so it can edit them more efficiently. Thus, when you save an Audacity Project File (.AUP), Audacity will automatically create a _data folder that has the same name as the AUP file and breaks the longer audio file into smaller chunks that have the .AU extension. Thus, when Audacity opens up the AUP Project File, it loads the individual AU files in the correct sequence automatically. The user should not move or rename and AU files in the _data folder.

Common Uses

  • Audacity audio editing
  • Audio project files

Audio Quality

Part of Audacity projects - quality depends on original source

Transcription Tips for AU

  • Export from Audacity as WAV or MP3 for best results
  • AU files are typically project chunks, not standalone audio

Where AU Files Come From

  • Audacity project folders
10x
Faster than real-time
Get your AU captions in minutes
99%
Accuracy rate
Industry-leading AI for AU files
53+
Languages
Captions in any language
30+
Export formats
SRT, VTT, SCC, and more
How It Works

Create captions from AU in 6 steps

Step 1

Create account

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

Step 2

Upload file

Upload your AU 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 AU 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 AU captions

Can you create closed captions from AU files?

Yes! Sonix transcribes your AU 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 AU 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 AU files

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Other file formats

AIF to text
OGG to text
OPUS to text
AMR to text
MPGA to text
AAC to text
AIFF to text
XSPF to text
WAV to text
CAF to text
See all supported file formats
Reviews

Trusted by accessibility teams

4.98 rating from 211 reviews

The fact that your service can export text as subtitles and can match the subtitles to the paragraphs in the transcript is just great! Also, the text editor is just awesome. The fact it bonds text and timing in the video so I can check and compare what was pronounced and what was recognized is truly fantastic.
ED
Eugene D.
Minsk, Belarus
Works very well with Arabic voices.
MA
Mohamed A.
Dubai, UAE
Sonix is quick and easy to use! It's efficient and transcriptions were very close to perfect - only a little editing needed!!
EC
Emma C.
London, England
Your UI and UX was one of the best I've seen. And I've seen a lot of them. Clean, simple, and pretty easy to edit.
JO
Jon O.
San Francisco, CA USA
It's SO fast! I couldn't believe it. It's saved me hours of time.
AF
Anne F.
Berlin, Germany
I am impressed by the almost perfect accuracy of the conversion and the speed by which the transcription was completed. Your web display is also impressive with clear and easy-to-u...
SS
Saiful S.
Bandar Seri Begawan, Brunei
The process was super easy. I liked that you can upload video file without stripping away the audio first to do it, this of course saves production time. Great job overall for sure!!!
AS
Aaron S.
San Francisco, CA USA
Easy to use and surprisingly accurate.
JB
Jon B.
Shakopee, MN, USA
Read more testimonials
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