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M4A to Text

Forty voice memos named New Recording. One by one, they become text you can actually use.

Painted transcription desk with a typewriter and tape recorder
Three steps

How does M4A to Text work?

Step 1: Upload or drop the file

Drag your .m4a into Speech to Text. Uploads up to 25 MB per file.

Step 2: A Whisper-class model transcribes

The audio goes to a Whisper-class model and the transcript comes back in the same view, usually within seconds.

Step 3: Copy, download, or save

Copy the text, download it as .txt, or save it to your library next to the source audio.

The format

What is an M4A file?

M4A is AAC audio in an MPEG-4 wrapper, and it is what Apple chose for everything voice on the iPhone: open a Voice Memo, record a lecture, capture a rehearsal, and the result is .m4a. AAC was designed as the successor to MP3, so it keeps speech crisp at small sizes, which is why a long memo stays light.

The typical M4A situation is rarely one file; it is a backlog. A phone holding months of half-remembered ideas, meeting notes, and interview snippets, each labeled by date and nothing else. Share or AirDrop them off the phone and they upload exactly as they are; no conversion app sits between the memo and the transcript.

Real sources

What records in M4A

  • iPhone Voice Memosthe default output of the most-used voice recorder on earth, shareable straight from the app.
  • Android recorder appsplenty of stock and third-party recorders on Android save AAC in the same .m4a wrapper.
  • Apple ecosystem exportsGarageBand bounces and audio-only QuickTime captures on a Mac come out as M4A.
  • Lecture and dictation appsstudy and note-taking apps that record audio overwhelmingly write this format.
The honest specifics
  • Uploads up to 25 MB per file
  • Reads .m4a
  • Output: plain text, as a copyable transcript or a .txt download
  • No watermark, yours to keep
Straight answers

M4A to Text questions, answered honestly.

How do I transcribe an iPhone voice memo?
Share the memo off the phone (AirDrop to a Mac, or the share sheet to files or mail), then drop the .m4a into Speech to Text. The transcript appears in the same view, ready to copy, download, or save alongside the recording.
Do I need to convert M4A to MP3 first?
No. M4A uploads are read natively, so converting first just adds a lossy step and a chore. The only time conversion helps is when a different tool in your workflow refuses the format; this one does not.
How long a memo fits under the 25 MB cap?
Voice memos record at modest bitrates, roughly half a megabyte per minute, so the cap holds somewhere near 50 minutes of memo; treat that as an estimate since settings vary. Most memos are minutes long, and those upload with room to spare.
My iPhone already transcribes memos. Why use this?
Recent iPhones do transcribe in-app, and for a quick glance that is plenty. This path earns its keep when you need the text out: a .txt download, a transcript you can keep in a library next to the audio, work done on a desktop, or memos from devices that never got the feature.
Keep converting

Related formats.

MP3 to TextMP4 to TextOGG to TextAll supported formats

Want the longer read? Open the Speech to Text guide in the docs.

Bring the file. Leave with the words.

Drop the recording into Speech to Text and read it back in seconds. Free to start, no credit meter.

Transcribe a fileAbout Speech to Text