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Supports: MOV
A MOV file from QuickTime, an iPhone, or a screen recorder carries a video track you may not need — converting to M4A keeps just the audio in a compact, Apple-friendly AAC file you can drop into Music, a podcast app, or a voice-memo archive. The QuickTime container (QTFF) is the format MP4 was later derived from, so the audio stream inside maps cleanly onto the MPEG-4 audio container that M4A uses. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after one hour — no sign-up, no watermark, never shared or made public.
M4A on this tool encodes with AAC, which holds roughly 30% more detail than MP3 at the same bitrate (a 192 kbps AAC file is broadly comparable to a 256 kbps MP3). Match the preset to the source material:
| Use case | Suggested setting | Approx. AAC bitrate | Why |
|---|---|---|---|
| Music / mastered audio | Highest or Very High | 256 kbps | Matches the 256 kbps AAC standard iTunes and Apple Music use |
| General listening | Very High (Recommended) | 192–256 kbps | Transparent to most ears, smaller than MP3 at equal quality |
| Podcast / interview | High or Medium | 96–128 kbps | Voice needs far less data than music |
| Voice memo / lecture | Low | 64 kbps | Smallest file where speech stays clear |
Yes — M4A is an audio-only container, so the video track is discarded during conversion and is not recoverable from the M4A. Keep your original MOV if you might need the picture later, or use MOV to MP4 instead to keep both streams in one file.
M4A (AAC) plays natively on iPhone, iPad, Mac, modern Android, recent car stereos, and every current browser — Chrome, Firefox, Edge, and Safari. If you need it on much older hardware or a device that only reliably handles MP3, convert the result with M4A to MP3, or skip M4A and use MOV to MP3 from the start.
AAC is a newer codec than MP3 and encodes more efficiently, preserving more high-frequency detail and cleaner stereo separation per kilobit. In practice you can drop the bitrate about 30% versus MP3 for the same perceived quality — which is why Apple settled on 256 kbps AAC rather than a higher MP3 rate.
Yes. Lower the Quality Preset, or switch File Compression to "Specific file size" or "Constant Bitrate" and set a target. A 60-minute spoken-word recording at 64 kbps lands near 28 MB, which clears Gmail's 25 MB inline limit only if you trim it slightly or step down further; music usually needs a higher bitrate to stay listenable.
There is no fixed duration cap — the practical limit is upload size and time, since the file travels to our servers over an encrypted connection before conversion. In our testing, a 5-minute 1080p MOV screen recording (about 180 MB) converted to a roughly 9 MB M4A at the Very High preset in well under a minute once uploaded.