Direct AAC and voice-memo input, with no MP3 detour
Use this M4A to text converter to turn an iPhone voice memo, interview, or lecture recording into editable text. M4A transcription works on the exported .m4a file directly: upload it, record in the browser, or import a supported media URL, then choose the spoken language and open the transcript editor to correct names and numbers before you export. Verified new accounts start with 5 transcription minutes.
Choose one file to continue in the transcription workspace.
Workflow
Choose one `.m4a` file from this device, drag it onto the drop zone, or record in the browser. On an iPhone, open Voice Memos, share the memo, and save it to Files or the app you will upload from; the exported `.m4a` keeps its name and can be selected here without renaming. The extension is matched case-insensitively, but a renamed, truncated, silent, or DRM-protected file can still fail validation or recognition.
Set the spoken language when you know it, and choose speaker labels if the recording has more than one voice. M4A is the MPEG-4 audio container that usually holds AAC audio, so the file uploads directly and does not need to be re-encoded to MP3 first. The workspace returns timed text that opens in an editor for checking.
Replay the timestamps around proper nouns, figures, acronyms, and quotations, then correct the draft. Export TXT for plain reading, DOCX for document editing, JSON for structured processing, or SRT and VTT when the timing has to travel with the words. TXT follows your corrections; caption and document exports are generated from the timed segments, so open the downloaded file before publishing.
Decision guide
A `.m4a` file is an MPEG-4 audio container that most commonly carries AAC audio, and it can also carry lossless ALAC. That is why a converter that only lists MP3 and WAV can reject a valid phone recording. M4A audio to text conversion should accept `.m4a` together with `.m4b`, `.m4p`, `.m4r`, and `.aac` files so everyday Apple audio can enter the workflow directly.
Adding an MP3 step re-encodes lossy audio a second time and can discard detail before speech recognition ever sees it. Upload the original `.m4a` instead. Conversion only makes sense when a downstream player or editor demands MP3, and it never improves transcription accuracy.
Selecting the language narrows the recognition search and usually produces a cleaner first draft than relying on detection. Use automatic detection when a file genuinely mixes languages or when you cannot tell what was spoken, then expect more cleanup around the switch points.
A single transcription is limited to 60 minutes and the available minutes must cover the task. For a long voice memo, trim unrelated silence or split the recording at natural breaks. The 5-minute verified-signup allowance is best spent on one representative section before committing to a full interview or lecture.
Use cases
Share the memo out of Voice Memos, upload the `.m4a`, and correct the text before pasting it into a document. Recording on a phone is often faster than typing, and transcription preserves the wording you can no longer replay by hand.
Enable speaker labels, check names and job titles against the audio, and keep timestamps with any quotation you plan to publish. A phone placed between two speakers still benefits from a quiet room and a short sound check.
Upload an authorized course recording, select the teaching language, and search the transcript for terminology instead of scrubbing through the whole file. Verify figures and references at the timestamp before relying on them.
Create a first-pass transcript for show notes, a blog outline, or a searchable archive, then export TXT or DOCX for the editor. For captions, export SRT or VTT and adjust line length and reading speed in the final video tool.
Commercial comparison
Comparison checked 2026-09-22. Verify live terms on each named product's page and the sources below.
| Decision factor | Whisper AI | Otter.ai | Happy Scribe |
|---|---|---|---|
| M4A and AAC input | Accepts .m4a, .m4b, .m4p, .m4r, .aac, and other common media directly, with no MP3 conversion step | Accepts many audio and video uploads; confirm current M4A support and per-file limits on its live uploader | Accepts common audio and video formats; verify the current M4A entry path before uploading |
| Editing and export | Editable, timestamped transcript with TXT, DOCX, JSON, SRT, and VTT exports | Meeting-focused notes and summaries; export options depend on the active plan | Transcript and subtitle editor; available exports and download limits depend on the active plan |
| Free entry | 5 transcription minutes after verified signup, with the allowance stated before processing | Offers a free tier with its own monthly and per-conversation limits; check the live plan page | A limited free trial leads into per-minute or subscription pricing; check the live plan page |
| Spoken-language handling | Choose the spoken language before processing, or rely on detection for mixed recordings | Language support varies by plan; check the current list | Language coverage varies by plan; check the current list |
| Best fit | People with phone voice memos and AAC files who want one editable transcript and flexible exports | Teams that mainly want meeting notes inside a shared workspace | Creators who want subtitle-oriented transcription on a per-minute plan |
Choose Whisper AI when the source is an .m4a voice memo or AAC recording and you want to upload it directly, choose the language, correct the text, and export the format your next tool needs. Compare each provider's live plan limits before processing a large library.
Before you begin
Clear answers
Yes. A Voice Memos recording exported from an iPhone is an .m4a file, and this page accepts it directly. Share the memo to Files or another app, then upload the file here; you can also record in the browser if you prefer not to leave the page. There is no need to email the memo to yourself or rename it.
No. M4A uploads directly and converting it to MP3 only adds a lossy re-encode and an extra step. MP3 conversion is useful when a specific player or editor cannot read the original, not as preparation for transcription.
Yes. Select the spoken language before processing when you know it, which usually produces a cleaner first draft. If a recording genuinely mixes languages, or you are unsure, leave detection enabled and expect extra review around the switch points.
M4A is the MPEG-4 audio container and file extension; AAC is the compressed audio codec usually stored inside it. The same container can also hold lossless ALAC. This page accepts .m4a files whether the audio inside is AAC or ALAC, alongside .m4b, .m4p, .m4r, and .aac files.
Yes. The result opens in the transcript editor, where you can correct names, numbers, and terminology and replay timestamps. You can then export TXT, DOCX, JSON, SRT, or VTT. TXT follows your corrections directly, while caption and document exports are built from the timed segments, so open the downloaded file after heavy editing.
An .m4a name only describes the container. The file may contain no audio track, damaged data, an unusual codec, or DRM from a protected store purchase, and a renamed file may not be M4A at all. Try the original export, confirm it plays locally, and check the recording length and size before retrying.
Evidence
Product and competitor details were checked on 22 September 2026. Commercial pages can change, so verify terms on each named product's live page and follow each source below before making a purchase or uploading sensitive media. Comparisons describe the checked pages and do not imply an endorsement.
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