Convert M4A to VTT

Create WebVTT caption files from your M4A audio for HTML5 video players. Convert Apple audio content to standards-compliant web captions.

HTML5 ready
5-min turnaround
Web compatible
Audio
Video
DOCX
SRT/VTT
PDF
53+ Languages
About This Format

Understanding M4A files

What is a M4A file?

Apple's audio format with superior quality at small sizes

An M4A audio file is a lossless audio format (and encoding algorithm) created by Apple and utilized on a variety of Apple products (including iPod, iPhone, iPad, iTunes, and Quicktime products). The m4a codec has been open-sourced so it is quite popular. M4A files are usually encoded with Advanced Audio Coding (AAC) which was originally designed to be the successor to MP3.
Both MP3 and M4A files are used for audio-only files, and are both unprotected (free from DRM features). Protected files will have a *.m4p file extension. AAC or M4A files do have better audio quality when compared to MP3 files when encoded at the same bitrate due to some of the codec’s improvements such as compression based on perception and a smaller block size for changing audio sounds and signals.

Common Uses

  • iTunes music library
  • Apple podcasts
  • Audiobook distribution
  • Voice memos on iPhone

Audio Quality

Better quality than MP3 at same file size

Transcription Tips for M4A

  • Excellent for transcription - designed for clear audio
  • AAC encoding provides better speech clarity than MP3
  • iPhone voice memos use M4A by default

Where M4A Files Come From

  • Apple Music
  • iTunes Store
  • iPhone/iPad recordings
  • Voice Memos app
10x
Faster than real-time
Get your M4A VTT in minutes
99%
Accuracy rate
Industry-leading AI for M4A files
53+
Languages
Captions in any language
30+
Export formats
VTT, SRT, text, and more
How It Works

Convert M4A to VTT in 6 steps

Step 1

Create account

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

Step 2

Upload file

Upload your M4A 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 and timestamps your M4A audio.

Step 5

Edit captions

Fine-tune caption timing and text with our editor.

Step 6

Export VTT

Download your M4A captions as a WebVTT file.

Common Questions

Everything about M4A to VTT

Can I convert M4A to VTT captions?

Yes! Sonix transcribes M4A files from any Apple device or application and exports to WebVTT format for HTML5 video and web accessibility.

What's the difference between VTT and SRT for M4A?

VTT (WebVTT) is the modern web standard supporting CSS styling. SRT is more universal for video editing. Choose VTT for web video, SRT for broader compatibility.

Can I style VTT captions from M4A?

Yes! WebVTT supports CSS styling for fonts, colors, and positioning. Sonix exports clean VTT files you can customize to match your brand.

How do I add M4A VTT captions to my website?

Add a <track> element to your HTML5 video pointing to your VTT file. The browser handles caption display automatically synchronized with your content.

Can I create multi-language VTT from M4A?

Yes! Transcribe your M4A once, then use Sonix's translation feature to create versions in 50+ languages. Export each as a separate VTT file.

Do M4A VTT captions work on mobile?

Yes! WebVTT is supported on all modern mobile browsers including iOS Safari and Android Chrome.

Why Sonix

Web-ready VTT from M4A files

HTML5 Native

VTT is the web standard for captions, supported by all modern browsers.

Styleable

Apply CSS styling for colors, fonts, positioning, and more.

Precise Timing

Word-level timestamps ensure perfect sync with your video.

Universal Support

Works with all HTML5 video players and web platforms.

Related

More ways to convert M4A files

Other M4A conversions

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Other file formats

XSPF to text
MTS to text
MPGA to text
AIF to text
MUS to text
AAC to text
WAV to text
WMA to text
AIFC to text
OPUS to text
See all supported file formats
Reviews

Trusted by web developers

4.98 rating from 211 reviews

It’s super easy to use and I was so impressed how fast the transcription came back. I love that you can listen to the recording while following along with the transcripts. I also like you can download the transcripts.
SS
Samantha S.
Suffolk County, NY USA
I love how easy and intuitive it is to use Sonix! I can now put my energy and focus on actual content, instead of going through the tedious and time consuming process of transcribing audio.
EL
Elina L.
San Francisco, CA USA
The experience is fantastic, the system is easy to use, and transcription quality in different languages is unbeatable. Sonix is the best system I've tried so far...and I know one ...
LM
Lana M.
Bern, Switzerland
Of all the programs that do this, I found you the best!
YC
Yaron C.
Tel Aviv, Israel
This is the best software I've used for transcription. Really happy about that!
LP
Lakshmi P.
Bengaluru, India
Very high accuracy transcription with noisy tapes / accents. The ability to edit as you listen is incredible. I haven't been impressed with code to this extent sin...
JC
Justin C.
St Charles, IL
Excellent tool if you're looking for an accurate Turkish transcription. I tried a handful of ones, and Sonix won by a landslide.
AK
Ahdi K.
Ankara, Turkey
Holy Cow. It works. This just saved me freaking DAYS of my life. I am totally getting a Sonix tattoo now!
JK
Jennifer K.
Charlotte, NC USA
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