When you save audio from a video, you'll often see two options: MP3 and M4A. Both are compressed audio formats, both sound good, and both play on most devices. So what's the difference, and which should you pick?
The short answer
- Choose MP3 if you want the file to play everywhere, including car stereos, old MP3 players, smart speakers, ringtone tools and any app.
- Choose M4A if you want slightly better quality for the same size and you mainly use modern phones, computers and Apple devices.
If you're not sure, MP3 is the safe default.
What MP3 is
MP3 dates from the early 1990s and became the format of digital music. Its biggest strength is that literally everything plays it: phones, browsers, cars, TVs, game consoles, DJ software, video editors.
MP3 is "lossy": it throws away sounds that people are unlikely to hear in order to make files smaller. At 192 kbps and above, most people can't tell an MP3 from the original in normal listening.
What M4A is
M4A is an audio file that usually contains AAC audio. AAC was designed as MP3's successor, and it's the format used by Apple Music, YouTube and most streaming services.
AAC is also lossy, but it's more efficient: at the same bitrate it generally sounds a bit better, especially at lower bitrates. A 128 kbps AAC file often sounds about as good as a 160 to 192 kbps MP3.
M4A plays on every modern iPhone, Android phone, Mac and Windows PC. Where it can fall down is older or simpler hardware: some car stereos, cheap Bluetooth speakers and older ringtone apps only accept MP3.
Side-by-side comparison
| MP3 | M4A (AAC) | |
|---|---|---|
| Compatibility | Everything | Modern devices |
| Quality at the same size | Good | Slightly better |
| Best at low bitrates | Weaker | Stronger |
| Typical use | Universal sharing, ringtones, cars | Apple devices, streaming, archiving |
Does converting between them lose quality?
Yes, a little. Both formats are lossy, so converting from one to the other means decoding and re-encoding, which loses a small amount of detail each time. In practice:
- Converting once at a good bitrate (192 kbps or higher) is inaudible for most listeners.
- Converting back and forth repeatedly slowly degrades the sound. Keep the original file if you can.
For example, when you choose Audio on our downloaders you get the original audio stream, usually M4A, with no conversion at all. Choosing MP3 converts it once at 192 kbps.
Which bitrate should you choose?
For MP3:
- 128 kbps for speech: podcasts, lectures, voice notes
- 192 kbps for most music and mixed content
- 320 kbps for music when you want the best MP3 can offer
Remember that converting can't add quality that wasn't there. A phone recording or a social media video won't sound better at 320 kbps than at 192.
What about WAV and FLAC?
WAV and FLAC are lossless: they keep every bit of the original sound. They're great for music production and archiving, but files are 5 to 10 times bigger. For listening and sharing, MP3 or M4A is the practical choice. Our video to MP3 converter also accepts WAV and FLAC files if you need to make them smaller.
How to get either format
- From a video on your device: use the video to MP3 converter. On Android, see how to extract audio from a video.
- From Facebook, X or Instagram: paste the link into the matching downloader and choose Audio (original, usually M4A) or MP3.
Pick MP3 for maximum compatibility, M4A for maximum efficiency, and you'll be fine either way.