About .m4a files
M4A is an AAC container — every Voice Memo, most Android recorder apps, and QuickTime audio exports land here. No conversion step: drop the file as-is.
Where .m4a files come from
iPhone Voice Memos, lecture recordings, interviews taped on a phone.
What you get
Speaker labels
Multi-voice recordings come back with each speaker separated and labelled.
Word-level timestamps
Every word is timed — accurate SRT/VTT subtitles come straight out.
100+ languages
The language is auto-detected; mixed-language recordings are handled per sentence.
Every export
TXT, SRT, VTT, DOCX and JSON on every pack — no format paywall.
Questions people ask
Do I need to convert .m4a to MP3 first?
No. Upload the .m4a file exactly as it is — decoding happens server-side, and lossless or original-codec input transcribes better than a re-compressed MP3 anyway.
Is there a size or length limit for .m4a files?
Files up to 10 hours each are accepted, and multi-gigabyte uploads resume if your connection blips.
How much does it cost?
The preview is instant with no signup. Credits are one-time purchases that never expire: $4 for 300 minutes, $12 for 2,000 minutes (about 36¢ per hour of audio).
Can I paste a link instead of uploading?
Yes — paste a direct link or a page URL and the audio is fetched server-side, which is faster than uploading from a slow connection.
Related: Audio to text · MP3 to text · Video to text · Subtitle generator