How to convert M4A to closed captions with automated transcription
Sign up for a free Sonix trial account—includes 30 minutes of free M4A to captions conversion.
Upload the MPEG-4 Audio File file(s) (*.M4A) from your computer, Dropbox, Google Drive, or by dragging it on the page.
Choose the language spoken in the uploaded M4A file. We support over 37 different languages including Russian, Chinese, Spanish, and English. Click the 'Start Transcribing Now' button.
Sonix will then automatically transcribe the audio from your M4A file and convert it to a simple text format. Grab a cupcake, it will take only a few minutes.
Use the Sonix AudioText Editor to polish your transcript before we convert it to a caption file. Simply type in your browser to correct any words in your transcript.
Click the 'Export' button. Choose either 'Subrip subtitle file (.srt)' or 'WebVTT file (.vtt)' from the dropdown to download the closed caption version of your M4A file. You can also adjust the character length and time duration length of each caption.
That's it! Your M4A file has now been converted to closed captioning and is ready for the next step in your workflow!
Thousands of incredible customers use SOnix to create closed captions from their M4A files
Convert M4A audio or speech to subtitle
Frequently Asked Questions for MPEG-4 Audio File (*.M4A)
What is a M4A file?
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.
Does Sonix transcribe audio files with a *.M4A file extension?
Yes, Sonix does automatically transcribe audio files with a .M4A file extension. Sonix is an online audio to text converter. Convert any audio (mp3, m4a, wav, ...) or video (mp4, mov, avi, ...) file to text without installing any software! Sonix quickly and accurately transcribes *.M4A files and converts them to text in a subtitle format.
Know anyone who needs to convert MPEG-4 Audio File (.M4A) to subtitle?
We'd appreciate it if you tell them about Sonix—the best way to convert M4A to subtitle.
Other ways to convert your M4A audio files with Sonix
Create closed captions from your MPEG-4 Audio File files with Sonix
Sonix transcribes your audio and video files in over 37 languages so they are easy to search, edit, and share. Sonix is an online, fully-automated speech to text service that quickly converts MPEG-4 Audio File files to captions. Sign up today and start transcribing.
Includes 30 minutes of free transcription