Transcribe M4A to text for $2/hour
iPhone Voice Memos, AAC podcasts, GarageBand exports — every M4A file uploads as-is. Speaker labels, 90+ languages, transcripts in under 5 minutes for most files.
Made for iPhone audio
M4A is the iPhone Voice Memos default. We accept the file Apple gives you — no conversion to MP3 first, no AirDrop-to-Mac dance.
Speaker labels included
Recorded a 1:1 interview, a phone call on speaker, or a meeting? We separate the voices automatically.
$2 per hour, $2 minimum
A 12-minute voice memo and a 55-minute interview both cost $2. No per-minute meter, no subscription.
Up to 10 hours per file
Long-form M4A like recorded all-day workshops or board meetings: upload directly, no chunking required (up to 500 MB / 10 hours).
From iPhone Voice Memo to text in 3 steps
Share from Voice Memos
In the iOS Voice Memos app, tap the recording, hit the Share icon, choose "Save to Files" or AirDrop to your Mac. The file you get is .m4a.
Upload to TranscribeCat
Drop the .m4a into the upload area on web. No format conversion needed. The page works on iPhone Safari too — you can upload directly from Files.
Get speaker-labeled text
Most voice memos finish transcribing in 1–3 minutes. Copy the text, export as SRT, or open the editor to rename speakers and trim sections.
Where M4A files come from and how AAC encoding works
M4A is a container format — specifically, MPEG-4 Audio. The audio inside is almost always AAC (Advanced Audio Coding), occasionally ALAC (Apple Lossless). AAC is the same codec inside YouTube videos, iTunes purchases, and most streaming services. It's a generation newer than MP3 and produces better quality at the same bitrate, which means iPhone Voice Memos sound surprisingly good for what is essentially a 64–96 kbps recording.
For transcription, this matters because iPhone Voice Memos default to a relatively low bitrate to save space — but AAC at 64 kbps preserves speech intelligibility better than an MP3 would at the same bitrate. The accuracy you see on a Voice Memos recording is essentially identical to what you'd get from a 128 kbps MP3 of the same source.
Two iPhone-specific quirks worth knowing:
- Lossless mode: iPhone 14 Pro and newer have an option to record in lossless ALAC. The files are ~10× larger but transcription accuracy is identical to compressed AAC for spoken content. Don't bother with lossless unless you also need the recording for music or voice cloning.
- Trim before upload: if you started recording 30 seconds early or left it running for 5 minutes after the meeting, trim it in Voice Memos first (Edit → drag the yellow handles). You'll save a minute or two of upload time and the transcript is cleaner.
Older Android phones and the M4A compatibility gap
One bit of M4A history that catches people out: some older Android voice recorder apps can't open .m4a files at all. AAC playback is licensed, and a handful of pre-2018 budget Android phones shipped without it. If you're trying to play an iPhone voice memo on an old Samsung or Huawei and getting an error, the file is fine — the playback app is what's missing.
For TranscribeCat, this doesn't affect you: our pipeline decodes AAC server-side using ffmpeg, which speaks every codec. The .m4a uploads from any device, including old Android phones via the web upload page in Chrome.
What M4A transcription actually costs
$2 per hour of M4A audio. Real examples:
$2
20-min voice memo
$4
90-min interview
$8
4-hour conference
$2 minimum per file. A 5-minute voice memo and a 55-minute one both cost $2 — bundle short clips manually if you have many.
Frequently asked questions
Are iPhone Voice Memos always M4A?+
Yes — Voice Memos always exports as .m4a (AAC inside an MPEG-4 container). If you AirDrop to a Mac, you get .m4a; if you Share to Files, you get .m4a; if you email the recording to yourself, you get .m4a.
How do I share a voice memo from iPhone to TranscribeCat?+
Open Voice Memos, tap the recording, tap the share icon (square with up arrow). The simplest path: tap "Save to Files" → save to iCloud Drive or On My iPhone. Then on web (any device), sign in to TranscribeCat and upload from that location. You can also upload directly from Safari on iPhone — the file picker shows your Voice Memos in Files.
Can I batch-upload several voice memos?+
Yes — drop up to 10 files into the upload area at once. Each is transcribed independently and counts as a separate $2 minimum. If you have many short voice memos, consider stitching them into one file with the Voice Memos "Save to Files" workflow plus a quick concatenation in QuickTime to save on the per-file minimum.
Does it work for AAC podcasts (.m4a) too?+
Yes — any M4A file with AAC audio inside transcribes the same way. The format is widely used for podcast distribution; we accept it directly without conversion.
What about Apple Voice Memos in lossless mode?+
Files recorded in iPhone 14 Pro+ lossless mode use ALAC inside the same .m4a container. We accept those too. The transcript is identical to what you'd get from a compressed version — the codec doesn't affect transcription accuracy on spoken content.
Is the transcript any different from MP3?+
No. The format is just the wrapper. Once we decode the audio, the transcription pipeline is identical. M4A and MP3 of the same source produce the same transcript.
Can I edit the transcript after?+
Yes. The editor lets you rename speakers (Speaker 1 → Alice), trim sections, and copy/export. Edits are saved to your account and the original transcript stays available.
Related M4A and iPhone resources
Drop your M4A and get a transcript
Voice memos, podcasts, AAC recordings — same flat $2 per hour with speaker labels.
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