How to Transcribe M4A Files: Top 3 Tools for iPhone/iOS Audio
June 8, 2025


For those of you struggling with transcribing m4a files recorded with Voice Memos on your iPhone or iPad, we'll introduce the best transcription methods!
For anyone looking to transcribe audio files, the recommended method is to use an AI transcription service.
However, it's important to note that some services may not support m4a files, unlike mp3 or WAV files.
Therefore, this article will introduce AI transcription services that support m4a file transcription and explain how to transcribe them!
By using an AI transcription service, anyone can easily and automatically transcribe m4a files recorded with Voice Memos on an iPhone or iPad (iOS) by simply uploading them.
Even long files can be transcribed in just 10 minutes!
Why not try transcribing your m4a files easily and smoothly using our recommended AI transcription service?
Transcribe M4A Files with 'Mojiokoshi-san'
For transcribing m4a files, 'Mojiokoshi-san' comes highly recommended.
'Mojiokoshi-san' is an AI transcription service that utilizes the latest speech recognition AI.
Using high-performance AI, it can accurately transcribe m4a files in just 10 minutes.
What's more, 'Mojiokoshi-san' allows you to switch between two types of AI.
Each has its own features:
- PerfectVoice: Ultra-fast transcription in 10 minutes even for long files, supports 100 languages.
- AmiVoice: Equipped with speaker diarization (transcribes per speaker), fast transcription in about the same time as the audio file length.
These features allow you to smoothly perform complex tasks in a short amount of time, such as transcribing foreign language audio or transcribing meeting minutes using the speaker diarization function.
In addition to m4a files, it also supports other audio files like mp3 and WAV, as well as video files, image files, and PDF files.
And.
Mojiokoshi-san is available for free!
You can transcribe up to 1 minute of audio for free without registration or login, allowing you to instantly convert your m4a files to text!
If you're unsure about transcribing m4a files, why not try 'Mojiokoshi-san' first?
What is an M4A file?
What exactly is an m4a file?
And how should you go about transcribing it?
We'll explain the characteristics of m4a files and the best transcription methods.
M4A files are audio files from iPhone/iPad (iOS)
An m4a file is a file format for storing audio or music.
It's a type of "mp4 file" used for videos and audio, and is primarily used on Apple products such as iPhones, iPads, and Macs.
When you record with Voice Memos on an iPhone or iPad (iOS), it saves as an m4a file.
However, unlike mp3 or WAV files, which are widely used on non-Apple products like Windows and Android smartphones, m4a files may not be readable by some services or apps.
Therefore, if you record meetings or interviews using an iPhone or iPad, you will need to use a service that can transcribe M4A files or convert the files.
Using an AI Transcription Service Compatible with M4A Files is Recommended
There are two ways to transcribe M4A files:
- Transcribe with an AI transcription service that can read M4A files.
- Convert M4A files to MP3 or WAV files before transcribing.
The recommended method is "1. Transcribe with an AI transcription service that can read M4A files."
Converting M4A files recorded with the Voice Memos app on iPhone or iPad (iOS) takes time and effort, such as copying them to a PC or uploading them to a conversion service.
On the other hand, if you choose an AI transcription service that supports M4A files from the start, you can simply upload the recorded M4A files directly from your iPhone or iPad.
You can start the transcription process immediately after a meeting or interview ends.
With an AI transcription service, transcription can be completed in just 10 minutes, allowing you to quickly review the content of your recorded M4A files in text format.
For transcribing files recorded on iPhone or iPad (iOS), it is recommended to use an AI transcription service that can read M4A files.
3 AI Transcription Services That Can Transcribe M4A Files
So, what specific services can transcribe M4A files?
Here are some AI transcription services that can transcribe M4A files recorded on iPhone or iPad (iOS)!
1. Mojiokoshi-san
Mojiokoshi-san is an AI transcription service recommended for those who want to transcribe M4A files.
Mojiokoshi-san is an AI transcription service that can transcribe many file types, including M4A files, as well as audio, video, images, and PDF documents.
It can transcribe quickly and with high accuracy using the latest high-performance AI.
As a service originating from Japan, you can feel secure regarding security.
Furthermore, Mojiokoshi-san allows you to switch between two types of AI transcription engines:
- PerfectVoice, which can transcribe long files in 10 minutes and supports 100 languages.
- AmiVoice, which offers speaker diarization (transcribes per speaker).
This means it can transcribe a wide range of content, including meetings, interviews, and foreign language transcriptions, with versatility.
What's more, Mojiokoshi-san allows you to transcribe up to 1 minute of audio for free, without registration or login!
If you're looking for a way to transcribe M4A files, why not try Mojiokoshi-san first?
2. RIMO Voice
RIMO Voice is an AI transcription service for transcribing Japanese audio.
It can read files and transcribe them, and of course, it supports M4A files.
The official user guide even recommends converting to M4A and uploading if MP3 or WAV file imports are unsuccessful.
If you use RIMO Voice, recording with the iPhone or iPad (iOS) Voice Memos app will lead to smoother transcription than using a dedicated IC recorder.
3. Otter
Otter, an AI transcription service that supports English, can also transcribe M4A files.
You can transcribe M4A files using the import function.
However, there's a limit to the number of imports; the free plan allows up to 3 imports per month, and the Pro plan allows up to 10 imports per month, which is quite restrictive.
This service is recommended when you record English meetings or interviews on your iPhone or iPad.
How to Transcribe M4A Files: Step-by-Step Guide
We'll explain the process of transcribing M4A files recorded on your iPhone or iPad (iOS), using the AI transcription service "Mojiokoshi-san" as an example.
1. Record
Record meeting or interview content using the Voice Memos app on your iPhone or iPad.
Voice Memos on iPhone and iPad (iOS) does not automatically save recordings when you stop them, so be sure to save your recording once you're finished.
This article also explains how to use Voice Memos on iPhone.
2. Open the Mojiokoshi-san Homepage
Mojiokoshi-san is a service you access through web browsers like Safari or Google Chrome.
You upload M4A files from the homepage.
Open the Mojiokoshi-san homepage from here.
3. Upload the File
Upload your M4A file.
You can select a file by tapping "Select".
Select the recorded file.
Once you select the file, the upload will start automatically.
*Do not close your browser window during the upload.
4. Start Transcription
Once the M4A file upload is complete, transcription will begin automatically.
*If you are registered and logged in, you can close the screen after the upload is finished.
*If you are transcribing for free, do not close the screen and wait for the transcription to complete.
5. Transcription Complete
You will be notified by email when the transcription is finished (if you are registered and logged in).
■ Example of Email Notification
If you closed the screen, you can view the transcription results via the link in the email or from the "History" section on the Mojiokoshi-san website.
When you view the history page, you'll see that the transcription is complete, like this.
/span>If you are transcribing for free, once the transcription is complete, the screen will switch and display the transcription results.
This completes the process of transcribing m4a files using "Mojiokoshi-san."
Ready to Transcribe Your M4A Files with Mojiokoshi-san?
As you can see, "Mojiokoshi-san" makes it easy to transcribe m4a files.
Why not try "Mojiokoshi-san" for easy and smooth transcription yourself?
AI Transcription Services are Recommended for M4A File Transcription
M4A files recorded on iPhone or iPad (iOS) may not be readable by some services.
Therefore, when choosing an AI transcription service, it's important to check in advance if m4a files can be uploaded.
With an AI transcription service like "Mojiokoshi-san," which allows you to upload m4a files directly without conversion, you can easily upload files and convert them to text immediately after a meeting or interview.
With an AI transcription service, anyone can transcribe m4a files easily in just 10 minutes.
There's no longer a need to painstakingly type out transcriptions by listening to audio files, as was necessary before the advent of AI!
For transcribing m4a files recorded with Voice Memos on iPhone or iPad (iOS), using an AI transcription service is highly recommended!
■ AI transcription service "Mr. Transscription"
"Mr. Transcription" is an online transcription tool that can be used from zero initial cost and 1,000 yen per month (* free version available).
- Supports more than 20 file formats such as audio, video, and images
- Can be used from both PC and smartphone
- Supports technical terms such as medical care, IT, and long-term care
- Supports creation of subtitle files and speaker separation
- Supports transcription in approximately 100 languages including English, Chinese, Japanese, Korean, German, French, Italian, etc.
To use it, just upload the audio file from the site. Transcription text is available in seconds to tens of minutes.
You can use it for free if you transcribe it for up to 10 minutes, so please try it once.
Email: mojiokoshi3.com@gmail.com
Transcription for audio / video / image transcription. It is a transcription service that anyone can use for free without installation.
- What is Mr. Transcription?
- Transcript images, sounds, and videos with Mr. Transcription
- Free registration
- Rate plan
- manual