Convert M4A to SRT

Generate perfectly-timed SRT subtitle files from your M4A audio. Convert Voice Memos, podcasts, and Apple audio content into subtitles ready for any video platform.

Timestamped
5-min turnaround
All platforms
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 SRT in minutes
99%
Accuracy rate
Industry-leading AI for M4A files
53+
Languages
Subtitles in any language
30+
Export formats
SRT, VTT, text, and more
How It Works

Convert M4A to SRT 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 subtitles

Fine-tune subtitle timing and text with our editor.

Step 6

Export SRT

Download your M4A subtitles as an SRT file.

Common Questions

Everything about M4A to SRT

Can I create SRT subtitles from an M4A file?

Yes! Upload your M4A file from iPhone, Apple Podcasts, or iTunes. Sonix transcribes with word-level timestamps and exports to SRT format ready for YouTube, Vimeo, or any video platform.

How accurate are M4A-to-SRT subtitle timings?

M4A's AAC encoding preserves audio quality well, resulting in precise timestamp generation. Sonix creates word-level timestamps accurate to within a few hundred milliseconds.

Can I convert iPhone Voice Memos to SRT?

Absolutely! Voice Memos recorded on iPhone in M4A format work perfectly. Great for creating subtitles from interview recordings, lecture notes, or meeting audio.

Can I add M4A SRT subtitles to YouTube?

Yes! SRT files from M4A audio work with YouTube, Vimeo, Facebook, and all major platforms. Upload the .srt file to your video's caption settings.

How do I edit M4A subtitle timing?

Use Sonix's visual editor to adjust subtitle timing by dragging boundaries or entering specific timestamps. Play the audio while editing to ensure perfect sync.

Can I include speaker labels from M4A podcasts?

Yes! Enable speaker detection and labels when exporting to SRT. Perfect for multi-host podcasts and interview content where viewers need to know who is speaking.

Why Sonix

Perfect SRT subtitles from M4A files

Precise Timestamps

Word-level timing ensures your subtitles sync perfectly with the audio.

Universal Format

SRT works with YouTube, Vimeo, Facebook, and all major video platforms.

Customizable

Adjust timing, line length, and caption duration to your needs.

Editor Friendly

Import directly into Final Cut Pro, Premiere, DaVinci Resolve, and more.

Related

More ways to convert M4A files

Other M4A conversions

M4A to Text

Convert now

M4A to PDF

Convert now

M4A to DOCX

Convert now

M4A to VTT

Convert now

M4A to Subtitles

Convert now

M4A to Captions

Convert now

Other file formats

MPA to text
CAF to text
OGG to text
AIFF to text
MUS to text
GSM to text
AAC to text
OPUS to text
AMR to text
WAV to text
See all supported file formats
Reviews

Trusted by video creators

4.98 rating from 211 reviews

Your app is amazing. Seriously, I'm blown away by the technology. The speed, accuracy, and the fact that you can play the audio and that it highlights the transcript in sync.
MR
Matt R.
Seattle, Washington
The level of accuracy and your UI is quite amazing. It allowed me to try the product without having to learn anything new, I was so happy about it I sent the results to a couple of friends because I knew at the moment that this could change the way I work.
GG
Ghislaine G.
Madrid, Spain
You guys are the best...hands down!
TG
Thomas G.
Boston, Massachussettes
I love Sonix.ai. They're fast and clean in transcription; they give 98% accuracy in your transcript. I enjoy every of my experience with Sonix...
FV
Frank V.
Lagos, Nigeria
Your product is amazing, I love so many features including the video capture on the side, ability to change the transcript as you go, highlighting, downloading audio files... SEARC...
VN
Vera N.
Brooklyn, NY USA
Impressed at how seamless Sonix makes editing transcripts. This is so much easier and more enjoyable than manually writing an entire transcript myself.
SA
Sean A.
Wellington, New Zealand
I really enjoyed how quickly and accurate the transcription system was. Will definitely use again in the future. I have recommended you to a friend.
WP
Walker P.
Wheeling, WV USA
I’m blown away by how accurate it was.
MS
Molly S.
Nashville, TN, USA
Read more testimonials
Get Started

Create M4A subtitles now

Try Sonix free with 30 minutes of transcription. No credit card required.

99% accuracy. Every word matters.

AI transcription and translation in 53+ languages.

30 minutes free
No credit card
Cancel anytime
Product
TranscriptionTranslationSubtitlesAI Analysis
Solutions
EnterpriseHealthcareLegalEducation
Resources
PricingAPI DocsSecurityContact
Let our support team help you with all of your automated transcription questions. Pictured: Christine Lee

Need help getting started?

Browse our Help Center , tutorials , and video guides .

Visit Help Center
Popular Resources
What is a vob fileHow do I convert my mp4 video to text?How to take meeting minutesHow to remove background noise from my videoWhat does closed caption meanHow do I add subtitles to my Zoom recording?